UWaVEflSfTYOF aiWOIS LIBRARY m UHMNftCH AMRMGN mWIRER^EARCH •3 AFCRL-TR-73-0171 j March 1973 V. FINAL REPORT, Contract No. F19628-72-C-0052 CLIMATOLOGY OF INSTANTANEOUS PRECIPITATION RATES Arthur L. Sims and Douglas M. A. Jones Illinois State Water Survey at the University of Illinois Urbana, Illinois 61801 ■'"■ Errata Prepared For AIR FORCE CAMBRIDGE RESEARCH LABORATORIES AIR FORCE SYSTEMS COMMAND UNITED STATE AIR FORCE BEDFORD, MASSACHUSETTS 017 30 Page Correction to be made 10 Replace page (Fig. 2). 11 Remove the portion of the first paragraph beginning with "In plotting these ..." through the end of the paragraph, 12 Replace page (Fig. 3). 39-44 Replace pages (Tables 21-26). 46-51 Replace pages (Tables 28-33). 54-56 Replace pages (Tables 36-38). 57 Change "8.8-mile" to read "8.6-mile". 58 Change "14.9-mile" to read "14.8-mile". 59 Change "21.1-mile" to read "21.3-mile". 60 Change "26.8-mile" to read "26.9-mile". 61 Change "32.5-mile" to read "32.2-mile". 6 3-65 Replace pages (Tables 45-47). 66 Change "21.0-mile" to read "21.2-mile". 67 Replace page (Table 49). 68 Change "33.2-mile" to read "33.3-mile". 70-71 Replace pages (Tables 52-53). Digitized by the Internet Archive in 2013 http://archive.org/details/climatologyofinssims -10- on CJ3 _J O 3: uu 0.01 0.1 1.0 PERCENT OF TIME THAT RAINFALL RATE EXCEEDS THRESHOLD 10 Figure 2. Cumulative frequency distributions of average rainfall rates for 3-mile, 21-mile, and 39-mile north-south lines in Central Illinois (data from Table 36 in the Appendix). - Corrected September 1973 -12- 12 16 20 24 LINE LENGTH, miles 28 32 36 40 Figure 3. Percent of time that line average rates are exceeded as a function of line length for north-south lines in Central Illinois (derived from the data of Table 36 in the Appendix ) - Corrected September 1973 -39- TABLE 21. FREQUENCIES OF 2-MINUTE AVERAGF PRECIPITATION RATES FOR THF 2-GAGE (3.1-MILE) NORTH-SOUTH LIME OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RA TF ( MM/MIN ) PFRCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 1.26E+00 l.OOE+00 7.94I--01 6.31F-01 5.01E-01 3.98F-0] 3.16E-01 2.5P--01 1.99F-0) 1 .581—01 1.26F-01 1.00F-01 7.94E-02 6.31F-02 5.C1E-02 3.98F-0? 3. 16F-02 2.51F-02 1 .99F-0? 1.58F-02 1.26E-02 l.OOE-02 7.94E-03 6.31F-03 5.C1F-03 i . 9 R E - 3 3.16F-03 2.51E-03 2.00F-03 1.58F-03 1.26F-03 l.OOE-03 7. 94 E -04 6.31F-04 5.01F-04 3.98E-04 3.16F-04 2.51 F-04 2.00F-04 1.58E-04 1.261-04 1.00F-04 2.04E-03 4.07E-03 1.22E-02 2.76F-02 4.68F-02 7. 13E-02 9.88E-02 1.35E-01 ] .70F-01 2.09E-01 3. 17F-01 4.76E-01 6.7 3F-01 8.RHF-01 1.13F+00 1.36E+00 1.61E+00 1.85E+00 2.05E+00 2.29F+00 2.51E+00 2.70E+00 2.83E+00 2.95E+00 3.03F+00 3. 11E+00 3.17E+00 3.24F+00 3.30F+00 3.36F+00 3.40F+00 3.43E+00 3.43F+00 3.45E+00 3.46F+00 3.47F+00 3.47F+00 3.49E+00 3.49E+00 3.49F+00 3.49F+00 3.50E+00 O.OOE+00 O.OOE+OO O.OOF+00 O.OOE+OO O.OOE+00 1.47F-02 1.95E-02 4.40F-02 9.29E-02 1.66E-01 4.35E-01 8.21F-01 1 .22E+00 1.62F+00 2.02E+00 2.46F+00 3.01F+00 3.41E+00 3.76F+00 4. 17F+00 4.54F+00 4.87F+00 5.06F+00 5.38E+00 5.63F+00 5.78E+00 5.94E+00 6. 13E+00 6. 32 F +00 6.51E+00 6.67F+00 6.78F+00 6.80E+00 6.8BF+00 6.88F+00 6.R8F+00 6.88F+00 6.95F+00 6.95F+00 6.95F+00 6.95F+00 6.96E+00 8.96E-03 1.34E-02 1.34F-02 2.69F-02 4.93E-02 7.^2F-02 1.08E-01 1.61F-01 1 .84E-01 2. 11E-01 2.51E-01 3.41F-01 4.88E-01 6.32E-01 9.18E-01 ] .07E+00 1 .22F + 00 1.32F+00 1.44E+00 1.52E+00 I .66F + 00 1 .75F+00 1.85E+00 1.91E+00 1.93E+00 1.95E+00 1 .96F + 00 2.01F+00 2.03F+00 2.03F+00 2.04F+00 2.0SF+00 2.06F+00 2.06F+00 2.06F+00 2.07E+00 2.07E+00 2.O7F+0O 2.07E+00 2.07F+00 2.07E+00 2.07F+00 O.OOE+OO O.OOF+00 O.OOE+00 4.63E-03 2.31E-02 3.70F-02 5.09E-02 5.56E-02 6.94E-02 7.41F-02 1.39F-01 2.08E-01 3.75E-01 6.25E-01 8.01E-01 1.06E+00 1 .30F + 00 1.57E+00 1.79E+00 2. 16E+00 2.43E+00 2.69F+00 2.87E+00 3.01E+00 3.04E+00 3. UE + OO 3.18E+00 3. 19F+00 3.25E+00 3.27E+00 3.27E+00 3.27E+00 3.27E+00 3.28F+00 3.33F+00 3. 33F+00 3.33E+00 3.34F+00 3.35E+00 3. 35E+00 3.35F+00 3.3SE+00 O.OOE+OO 4.4RF-03 3.58E-02 7.62E-02 1.16E-01 1.61E-01 2.28E-0] 2.96E-01 3.54E-01 3.8] E-01 4.39E-01 4.88F-01 5.42E-01 6.41E-01 7.08E-01 7.80E-01 8.74E-01 1.01E+00 1.08F+00 1.23E+00 1.37E+00 1.48E+00 1 .54E+00 1.57E+00 1.59E+00 1.66E+00 1 .69F+00 1.74E+00 1.76E+00 1 .80E+00 1.81E+00 1.81 E+00 1.82E+00 1.82E+00 1.82E+00 1.82E+00 1 .82E + 00 1.82E+00 1.82F+00 1.82E+00 1.82E+00 1.88F+00 O.OOE+OO O.OOE+00 8.68E-03 2.60E-02 3.47E-02 5.21E-02 6.08E-02 8.68E-02 1.13E-01 2.00F-01 3.30F-01 6.08F-01 8.68E-01 1.06E+00 1.35E+00 1.61F+00 1.85E+00 2.28E+00 2.53E+00 2.76E+00 2.93E+00 3.06E+00 3.19E+00 3.23E+00 3.28F+00 3.40E+00 3.45E+00 3.48E+00 3.51F+00 3.55E+00 3.56E+00 3.56E+00 3.56F+00 3.56F+00 3.56E+00 3.57F+00 3.57E+00 3.57E+00 3.57F+00 3.57F+00 3.57E+00 3.57F+00 OPFRAT I TIN TIME (MINI 196444 40924 44640 43200 44640 23040 -CORRECTED SEPTEMBER 1973 -RO- TABLE 22. FREQUENCIES OF 2-MINUTE AVERAGE PRECIPITATION RATES FOR THE 4-GAGE (8.6-MILE) NORTH-SOUTH LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL ) THROUGH AUGUST 16, 1970 THRESHOLD PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD RATF (MM/MIN) ALL DATA APR MAY JUN JUL AUG 1.26F+00 2.02F-03 O.OOE+00 4.48E-03 O.OOE+00 4.48E-03 O.OOE+00 l.OOE+00 4.04E-03 O.OOF+00 1.34E-02 O.OOE+00 4.48E-03 O.OOE+00 7.94F-01 9.08E-03 O.OOE+OO 1.34E-02 O.OOE+OO 2.69E-02 O.OOE+OO 6.31E-01 1.41E-02 O.OOE+00 2.24E-02 O.OOE+00 3.58E-02 8.68E-03 5.01E-01 3.13E-02 O.OOE+OO 4.48E-02 O.OOE+OO 7.62E-02 3.47E-02 3.9RE-01 5.85E-02 1.40E-02 6.27E-02 3.24E-02 1.30E-01 4.34E-02 3.16F-01 8.37E-02 2.34E-02 9.86F-02 4.17F-02 1.79E-01 6.08E-02 2.51E-01 1.24E-01 4.68F-02 1.21E-01 8.80E-02 2.64E-01 6.94E-02 1.99F-01 1.66E-01 7.96E-02 1.75F-01 9.72E-02 3.49E-01 8.68E-02 1.58E-01 2.25E-01 1.59E-01 2.11E-01 1.48E-01 4.12E-01 1.56E-01 1.26E-01 3.16E-01 3.70E-01 2.64E-01 I.A2E-01 4.97E-01 2.52F-01 1.00F-01 4.R5E-01 7.58F-01 3.18E-01 2.73E-01 5.65E-01 5.47E-01 7.94F-02 6.96E-01 1.18E+00 4.97E-01 4.17E-01 6.45E-01 7.99E-01 6.31E-02 9.10E-01 1.47E+00 6.59E-01 6.90E-01 7.71E-01 1.03E+00 5.01F-02 1.14E+00 1.86E+00 9.23E-01 8.43E-01 9.01E-01 1.26E+00 3.98F-02 1.40E+00 2.34E+00 1.14F+00 1.04E+00 1.04E+00 1.50E+00 3.16E-02 1.64E+00 2.69E+00 1.31E+00 1.32E+00 1.16E+00 1.83E+00 2.51E-02 1.88E+00 3.08E+00 1.42E+00 1.62F+00 1.31E+00 2.19E+00 1.99E-02 2.15E+00 3.50E+00 1.54E+00 1.98E+00 1.47E+00 2.46E+00 1.58E-02 2.38E+00 3.93E+00 1.70E+00 2.19E+00 1.59E+00 2.73E+00 1.26F-02 2.60E+00 4.25E+00 1.85F+00 2.50E+00 1.73F+00 2.90E+00 l.OOE-02 2.81E+00 4.49E+00 2.O2E+00 2.80E+00 1.90F+00 3.01E+00 7.94E-03 3.02E+00 4.78E+00 2.20E+00 2.98F+00 2.07E+00 3.26F+00 6.31E-03 3.22E+00 5.06F+00 2.35E+00 3.22E+00 2.20E+00 3.48E+00 5.01F-03 3.38E+00 5.28F+00 2.50E+00 3.44E+00 2.28E+00 3.60E+00 3.98E-03 3.55E+00 5.61E+00 2.64E+00 3.65E+00 2.34E+00 3.63E+00 3.16E-03 3.69E+00 5.81E+00 2.74E+00 3.80F+00 2.42E+00 3.84E+00 2.51E-03 3.81E+00 6.02F+00 2.80F+00 3.97E+00 2.50E+00 3.93E+00 2.00E-03 3.90E+00 6.13E+00 2.88E+00 4.04F+00 2.59E+00 A.OOF+OO 1.58E-03 4.05F+00 6.49E+00 2.97E+00 4.17E+00 2.68E+00 4.03E+00 1.26E-03 4.14E+00 6.76F+00 3.02F+00 4.20F+00 2.73E+00 4.07E+00 1.00E-03 4.18F+00 6.83E+00 3.03E+00 4.25E+00 2.78E+00 4.09E+00 7.94E-04 4.29E + 00 7.02F + 00 3.04E + 00 4.50E + 00 2.8h>E + 00 4.09E + 00 6.31E-04 4.36F+00 7.17F+00 3.05E+00 4.61E+00 2.86E+00 4.11F+00 5.01E-04 4.40E+00 7.19E+00 3.11E+00 4.64E+00 2.93E+00 4.11F+00 3.98F-04 4.52E+00 7.32F+00 3.12E+00 5.01E+00 2.96E+00 4.14E+00 3.16E-04 4.S4E+00 7.43F+00 3.12F+00 5.01E+00 2.96E+00 4. 14E+00 2.51E-04 4.55F+00 7.46F+00 3.13F+00 5.02F+00 2.96E+00 4.14E+00 2.00E-04 4.58E+00 7.54F+00 3.14E+00 5.04F+00 2.96E+00 4.15E+00 1.58E-04 4.59F+00 7.57E+00 3.16E+00 5.04E+00 2.98E+00 4.15E+00 1.26F-04 4.59F+00 7.S7F+00 3.15E+00 5.04E+00 2.98E+00 4.15E+00 1.00F-04 4.59F+00 7.57E+00 3.15F+00 5.04F+00 2.98E+00 4.15E+00 7.94F-0'> 4.59F + 00 7.57F + 00 3.15F + 00 5.04F + 00 2.98E + 00 4.15E + 00 6.31E-05 4.60E+00 7.58F+00 3.15E+00 5.04E+00 3.01F+00 4.15E+00 5.01F-05 4.60E+00 7.58E+00 3.15E+00 5.04E+00 3.01E+00 4.15E+00 3.98E-0S 4.60E+00 7.59E+O0 3.15F+00 5.04E+00 3.01E+00 4.15E+00 3.16F-05 4.61E+00 7.60E+00 3.15E+00 5.04E+00 3.01E+00 4.15E+00 OPFRATIUN 198244 42724 446^0 43200 44640 23040 TIMF (MIN) -CORRECTED SEPTEMBER 1973 •CI- TABLE 23. FREOUENCIFS OF 2-MINUTF AVERAGE PRECIPITATION RATES FOR THE 6-GAGE (14.8-MILE) NORTH-SOUTH LIME OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATE (MM/MIN) PERCENT OF TIME THAT RATE IS GRFATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 1.26E+00 l.OOF+00 7.94E-01 6.31E-01 5.01E-01 3. 986-01 3.16E-01 2.51E-01 1.99E-01 1.58E-01 1.26E-01 l.OOF-01 7. 941- -0 2 6.31F-02 5.01E-02 3.986-02 3.16F-02 2.51F-02 1.99E-02 1.58E-02 1.26F-02 1.00F-02 7.94E-03 6.31E-03 5.01E-03 3.98F-03 3.16E-03 2.51F-03 2.00E-03 1.5HF-03 1.26F-03 l.OOE-03 7.94E-04 6.31F-04 5.01 E-0 4 3.98E-04 3.16E-04 2.51E-04 2.00E-04 1.58F-04 1.26E-04 1.00F-04 7.94E-0S 6.316-05 5.01E-O5 3.98F-05 3.16E-05 2.51F-05 2.00E-05 2.03E-03 4.05E-03 8.10E-03 1.22E-02 2.03E-02 3.44E-02 7.49E-02 1.27E-01 1.72E-01 2.I9E-01 3.29F-01 4.88E-01 7.08F-01 9.18E-01 1. 15E+00 1.41E+00 1.63F+00 1.94E+00 2.22E+00 2.50E+00 2.74E+00 2.97E+00 3.20E+00 3.45E+00 3.68E+00 3.88F+00 4.05E+00 4.23E+00 4.35E+00 4.48E+00 4.59F+00 4.71E+00 4.80E+00 4.89E+00 5.02E+00 5.08E+00 5.10E+00 5. 14E+00 5.19E+00 5.20E+00 5.22E+00 5.23E+00 5.23F+00 5.23E+00 5.236+00 5.25E+00 5.25F+00 5.25E+00 5.25F+00 O.OOE+00 O.OOE+00 O.OOE+OO O.OOE+00 O.OOE+OO O.OOE+00 2.38E-02 3.34F-02 5.24F-02 1.00E-01 3.57E-01 7.34E-01 1. 17E+00 1.48E+00 1.74E+00 2. 16E+00 2.56E+00 2.95E+00 3.30E+00 3.71E+00 4.04E+00 4.26F+00 4.53F+00 4.78E+00 5.066+00 5.35E+00 5.52E+00 5.856+00 6.06E+00 6.36E+00 6.536+00 6.76E+00 6.95E+00 7.08E+00 7.35E+00 7.58E+0O 7.68E+00 7.83F+00 8.01F+00 8.03E+00 8.10F+00 8. 15E+00 8.17F+00 8. 18E + 00 8.18F+00 8.18E+00 8. 18F+00 8. 18F + 00 8.21F+00 4.48E-03 1.34F-02 1.34E-02 2.24E-02 3.58E-02 3.58E-02 8.51E-02 1.21E-01 1.61E-01 2.02E-01 2.73E-01 3.58F-01 5.24E-01 7.08E-01 9.77E-01 1.20E+00 1.37E+00 1.58E+00 1 .74E+00 1.96E+00 2.21E+00 2.44E+00 2.62E+00 2.87E+00 3.15E+00 3.32E+00 3.49E+00 3.62E+00 3.70E+00 3.80E+00 3.86E+00 3.88E+00 3.89E+00 3.99E+00 3.99E+00 4.00E+00 4.01E+00 4.01E+00 4.04E+00 4.04E+00 4.04E+00 4.04E+00 4.04E+00 4.04E+00 4.04F+00 4.04E+00 4.04E+00 4.04E+00 4.05E+00 O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+OO O.OOF+00 4.63E-03 4.17E-02 1.02E-01 1.48E-01 1.76F-01 2.13E-01 2.87E-01 4.07E-01 6.02E-01 8.01E-01 9.91E-01 1.19E+00 1.59E+00 1.96E+00 2.33E+00 2.67E+00 2.96F+00 3.26E+00 3.69E+00 3.99E+00 4.22E+00 4.48E+00 4.65E+00 4.84E+00 4.90E+00 5.12E+00 5.35F+00 5.50E+00 5.57E+00 5.89E+00 5.91E+00 5.92E+00 5.92E+00 5.95E+00 5.97E+00 5.97F+00 5.97F+00 5.97F+00 5.97E+00 5.97E+00 6.03F+00 6.03E+00 6.036+00 6.03E+00 4.48E-03 4.48E-03 2.24E-02 3. 14E-02 5.38E-02 9.41E-02 1.66E-01 2.73F-01 3.67F-01 4.48E-01 5.56E-01 6.59E-01 7.71F-01 8.78E-01 1.05E+00 1.25E+00 1.41E+00 1.60E+00 1.80E+00 1.93E+00 2.04E+00 2.23E+00 2.39E+00 2.49E+00 2.63E+00 2.79E+00 2.91E+00 3.006+00 3.02E+00 3. 11E+00 3.16F+00 3.25E+00 3.286+00 3.37E+00 3.39E+00 3.40E+00 3.41E+00 3.41E+00 3.42E+00 3.42E+00 3.42E+00 3.42E+00 3.42E+00 3.42E+00 3.42E+00 3.43E+00 3.43E+00 3.43E+00 3.43E+00 O.OOE+OO O.OOE+00 O.OOE+OO O.OOE+00 O.OOE+OO 3.47E-02 3.47E-02 6.94E-02 7.81E-02 1.04E-01 1.65E-01 3.39E-01 6.60E-01 9.64E-01 1.23E+00 1.55E+00 1.71E+00 2. 10E+00 2.48E+00 2.77E+00 2.92E+00 3. 10E+00 3.37E+00 3.57E+00 3.67E+00 3.81E+O0 3.89E+00 4.02E+00 4.13E+00 4.23E+00 4.24E+00 4.26E+00 4.30E+00 4.306+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31F+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 4.31E+00 OPFRATION TIME (MIN) 197492 41972 44640 43200 44640 23040 -CORRECTFI) SFPTFMBER 1973 -42- TABLE 24. FREQUENCIES OF 2-MINUTF AVERAGF PREC I P I T A T I (IN RATES FOR THE 8-GAGE (21.3-MILE) NORTH-SOUTH LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATF (MM/MIN) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG l.OOE+00 7.94E-01 6.31F-01 5.01E-01 3.98E-01 3.16E-01 2.51F-01 1.99E-01 1.58F-01 1.26F-01 l.OOF-01 7.94E-02 6.31F-02 5.01E-02 3.98F-02 3.16E-02 2.51F-02 1.99F-02 1.58E-02 1.26F-02 l.OOE-02 7.94E-03 6.31E-03 5.01 F-03 3.98E-03 3.16E-03 2.51E-03 2.00E-03 1.58F-03 1.26E-03 l.OOF-03 7.94E-04 6.31E-04 5.01E-04 3.98E-04 3.16F-04 2.51E-04 2.00E-04 1.58F-04 1.26F-04 1.00E-04 7.94F-05 6.31E-05 5.01E-05 3.98E-05 3.16E-05 2.51F-05 2.00F-05 1.58F-05 2.03E-03 5.07E-03 8.11E-03 1.42E-02 3.14E-02 5.98E-02 1.10F-01 1.73F-01 2.21E-01 3.53E-01 5.20E-01 7.55F-01 9.91E-01 1.21E+00 1.50E+00 1.77E+00 2.08E+00 2.40E+00 2.67E+00 2.92E+00 3.22E+00 3.44E+00 3.65E+00 3.89E+00 4. 12E+00 4.34F+00 4.54E+00 4.72E+00 4.90E+00 5.06E+00 5.15E+00 5.25F+00 5.33E+00 5.45E+00 5.50E+00 5.60E+00 5.68E+00 5.72E+00 5.77E+00 5.77E+00 5.77E+00 5.79E+00 5.79E+00 5.81E+00 5.81E+00 5.81E+00 5.82E+00 5.82E+00 5.82E+00 O.OOE+OO O.OOE+00 O.OOE+OO O.OOE+00 1.44E-02 1.44E-02 2.87E-02 5.27F-02 1.10E-01 3.97E-01 7.85F-01 1.21E+00 1.53E+00 1.83E+00 2.26F+00 2.62F+00 3.05E+00 3.52E+00 3.87E+00 4.13E+00 4.41E+00 4.74E+00 5.02F+00 5.22E+00 5.51E+00 5.80E+00 6. 16E + 00 6.45E+00 6.93E+00 7.21E+00 7.44E+00 7.69E+00 7.90E+00 8.19E+00 8.25E+00 8.47E+00 8.76E+00 8.92E+00 9.06E+00 9.07E+00 9.08E+00 9.15E+00 9.15E+00 9.15E+00 9.15E+00 9.15F+00 9.18E+00 9.18E+00 9.19E+00 4.48E-03 1.34E-02 1.34E-02 2.24E-02 4.48E-02 6.27E-02 1.08E-01 l.ME-01 1.97E-01 2.82E-01 3.72E-01 5.60E-01 7.44E-01 9.77E-01 1.26E+00 1.52E+00 1.76E+00 2.01E+00 2.25F+00 2.56E+00 2.81E+00 3.00E+00 3.21E+00 3.46E+00 3.65E+00 3.88E+00 4.05E+00 4.19E+00 4.26E+00 4.34E+00 4.36E+00 4.39E+00 4.40E+00 4.40E+00 4.47E+00 4.48E+00 4.49E+00 4.50E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.54E+00 4.54E+00 4.54E+00 O.OOE+00 O.OOE+00 O.OOE+OO O.OOE+00 4.63E-03 2.31E-02 6.94E-02 1 .39E-01 1.81E-01 2.64E-01 3.43E-01 4.95E-01 7.08E-01 8.43E-01 1.07E+00 1.36E+00 1.75F+00 2.14E+00 2.45E+00 2.85E+00 3.36E+00 3.62E+00 3.82E+00 4.23E+00 4.62E+00 4.84E+00 5.06E+00 5.24E+00 5.44E+00 5.66E+00 5.78F+00 5.92E+00 5.97E+00 6.13E+00 6.20E+00 6.43E+00 6.48E+00 6.49E+00 6.52E+00 6.54E+00 6.54F+00 6.54E+00 6.54E+00 6.60E+00 6.60E+00 6.60E+00 6.61E+00 6.61E+00 6.61E+00 4.48E-03 8.96E-03 2.24E-02 4.03E-02 6.72E-02 1.48E-01 2.60E-01 3.81E-01 4.48F-01 5.73E-01 7.03E-01 8.74E-01 1.01E+00 1.21E+00 1.37E+00 1.54E+00 1.74E+00 1.89E+00 2. 10E+00 2.22E+00 2.40E+00 2.53E+00 2.64E+00 2.75E+00 2.84E+00 3.02E+00 3.08E+00 3.26E+00 3.30E+OO 3.41E+00 3.43E+00 3.46E+00 3.53E+00 3.63E+00 3.6SE+00 3.66E+00 3.66E+00 3.68E+00 3.69E+00 3.69E+00 3.69E+00 3.69E+00 3.69E+00 3.71E+00 3.71E+00 3.71E+00 3.71E+00 3.71E+00 3.7 1E+00 O.OOE+00 O.OOE+00 O.OOE+OO O.OOE+00 1.74E-02 3.47E-02 5.21E-02 7.81E-02 1.04E-01 1.48E-01 3.04E-01 5.73E-01 9.90E-01 1.25E+00 1.60E+00 1.92E+00 2.26E+00 2.56E+00 2.77E+00 2.93E+00 3. 15E+00 3.40E+00 3.62E+00 3.85E+00 4.03E+00 4.18E+00 4.40E+00 4.50E+00 4.53E+00 4.61E+00 4.69E+00 4.73E+00 4.74E+00 4.77E+00 4.77E+00 4.77E+00 4.77E+00 4.77E+00 4.78E+00 4.78E+00 4.78E+00 4.78E+00 4.78E+00 4.78E+00 4.79E+00 4.79E+00 4.79E+00 4.79E+00 4.79E+00 OPERATION TIMF (MIN) 197292 41772 44640 43200 44640 23040 -CORRECTED SEPTFMBER 1973 -43- TAflLE 25. FREQUENCIES OF 2-MINUTE AVERAGE PRECIPITATION RATES FOR THE 10-GAGE (26.4-MILE) NORTH-SOUTH LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATE (MM/MIN) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 7.94E-01 6.31E-01 5.01E-01 3.98E-01 3.16E-01 2.51E-01 1.99E-01 1.58F-01 1.26E-01 l.OOE-01 7.94E-02 6.31E-02 5.01E-02 3.9SE-02 3.16E-02 2.51E-02 1.99E-02 1.58E-02 1.26E-02 l.OOE-02 7.94E-03 6.31E-03 5.01E-03 3.9RE-03 3.16E-03 2.51E-03 2.00E-03 1.58E-03 1.26E-03 1.00E-03 7.94E-04 6.31E-04 5.01E-04 3.98E-04 3.16E-04 2.51E-04 2.00E-04 1.58E-04 1.26E-04 1.00E-04 7.94E-05 6.31E-05 5.01F-05 3.98E-05 3. 16E-05 2.51E-05 2.00F-05 1.58E-05 1.26E-05 1.00E-05 3.04E-03 6.08E-03 1.22E-02 2.43E-02 5.37E-02 9.23E-02 1.65E-01 2.41E-01 3.56E-01 5.35E-01 7.50E-01 l.OOE+00 1.26E+00 1.54E+00 1.R3E+00 2.17E+00 2.46E+00 2.77E+00 3.04E+00 3.30E+00 3.56E+00 3.82E+00 4.06E+00 4.30E+00 4.55E+00 4.80E+00 5.00E+00 5.19E+00 5.34E+00 5.48E+00 5.57E+00 5.66E+00 5.80E+00 5.93E+00 6.01E+00 6.12E+00 6.15E+00 6.17E+00 6.22E+00 6.22E+00 6.23E+00 6.23E+00 6.24E+00 6.25E+00 6.25E+00 6.25E+00 6.2HE+00 6.2RF+00 6.28E+00 6.2RE+00 O.OOE+00 O.OOE+00 O.OOE+00 1.44E-02 1.44E-02 2.39E-02 5.27E-02 1.05E-01 3.78E-01 8.00E-01 1. 15E+00 1.58E+00 1.88E+00 2.30E+00 2.71E+00 3.09E+00 3.53E+00 3.87E+00 4.22E+00 4.50E+00 4.74E+00 5.11E+00 5.43E+00 5.7RF+O0 6. 13E + 00 6.51E+00 6.87E+00 7.14E+00 7.48E+00 7.82E+00 8.02E+00 8.16E+00 8.59E+00 8.85E+00 9.07E+00 9.28E+00 9.39E+00 9.42E+00 9.57E+00 9.59E+00 9.60E+00 9.60F+00 9.61E+00 9.62E+00 9.62E+00 9.62E+00 9.72E+00 9.72E+00 9.72E+00 9.73F+00 8.96E-03 1.34E-02 2.24E-02 3.58E-02 5.38E-02 8.06E-02 1.52E-01 1.88E-01 2.64E-01 3.81E-01 5.69E-01 7.71E-01 9.86E-01 1.24E+00 1.54E+00 1 .89E+00 2.08E+00 2.35E+00 2.64E+00 2.93E+00 3.21E+00 3.41E+00 3.61E+00 3.80E+00 4.04E+00 4.21E+00 4.35E+00 4.49F+00 4.57E+00 4.65E+00 4.70E+00 4.72E+00 4.80E+00 4.85E+00 4.91E+00 4.91E+00 4.93E+00 4.94E+00 4.96E+00 4.97E+00 4.98E+00 4.98E+00 4.98E+00 4.99E+00 4.99E+00 4.99F+00 5.00E+00 5.00E+00 5.00F+00 5.00F+00 O.OOE+OO O.OOE+00 O.OOE+00 4.63E-03 1.85E-02 5.56E-02 1.62F-01 2.78E-01 3. 19E-01 3.98E-01 5.37E-01 7.45E-01 9.49E-01 1.18E+00 1.44E+00 1.82E+00 2.22E+00 2.66E+00 3.00E+00 3.36E+00 3.72E+00 4.05E+00 4.33E+00 4.63E+00 4.95E+00 5.20E+00 5.44E+00 5.69E+00 S.91E+00 5.97E+00 6.09E+00 6.21E+00 6.29E+00 6.47E+00 6.50E+00 6.74E+00 6.76E+00 6.7RE+00 6.81E+00 6.81E+00 6.81E+00 6.81E+00 6.81E+00 6.87E+00 6.87E+00 6.88E+00 6.88E+00 6.88E+00 6.88E+00 6.88E+00 4.48E-03 1.34E-02 3. 14E-02 5.38E-02 1. 39E-01 2.24F-01 3.32E-01 4.61E-01 5.69E-01 6.99E-01 8.78E-01 1.02E+00 1.22E+00 1.42E+00 1.59E+00 1.81E+00 2.00E+00 2.24E+00 2.38E+00 2.54E+00 2.67E+00 2.R6E+00 2.98E+00 3.11E+00 3.25E+00 3.47E+00 3.57E+00 3.70E+00 3.72E+00 3.82E+00 3.85E+00 3.88E+00 3.97E+00 4.05E+00 4.09E+00 4. 12E + 00 4. 14E+00 4.14E+00 4. 15E+00 4.15F+00 4. 16F+00 4.16E+00 4. 16E + 00 4.16E+00 4. 16E+00 4.16E+00 4. 16E+00 4.16E+00 4. 16E+00 4. 16E+00 O.OOE+00 O.OOE+OO O.OOE+00 O.OOE+OO 2.60E-02 5.21E-02 7.81E-02 9.55E-02 1.48E-01 2.95E-01 5.21E-01 8.33E-01 1.31E+00 1.70E+00 1.99E+00 2.36E+00 2.60E+00 2.83E+00 3.02E+00 3.25E+00 3.48E+00 3.72E+00 4.06E+00 4.24E+00 4.44E+00 4.70E+00 4.84E+00 4.97E+00 5.03E+00 5.13E+00 5.22E+00 5.33E+00 5.34E+00 5.37E+00 5.39E+00 5.40E+00 5.41E+00 5.45E+00 5.47E+00 5.48E+00 5.48E+00 5.49E+00 5.49E+00 5.49E+00 5.49E+00 5.49E+00 5.49E+00 5.49E+00 5.49E+00 5.49E+00 OPFRATION TIME (MIN) 197284 41764 44640 43200 44640 23040 -CORRECTED SEPTEMBER 1973 -DA- TABLE 26. FREOUENCIES OF 2-MINUTF AVERAGE PRECIPITATION RATES FOR THE 12-GAGE (32.2-MILE) NORTH-SOUTH LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATF ( M M / M I N ) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 6.31E-0] 5.01E-01 3.98E-01 3.16E-01 2.51E-01 1.99E-01 1.58F-01 1.26E-01 1.00E-01 7.94F-02 6.31F-02 6.01F-02 3.98F-02 3.16E-02 2.51E-02 1.99E-02 1.5BE-02 1.26E-02 l.noF-o? 7.94E-03 6.31E-03 5.01E-03 3.98E-03 3.16F-03 2.51E-03 2.00E-03 1.58F-03 1.26F- 03 l.OOE-03 7.94F-04 6.31F-04 5.01F-04 3.98E-04 3. 16E-04 2.51E-04 2.00F-04 1.58E-04 1.26E-04 1 .00E-04 7.94t -05 6.31E-05 5.01F-05 3.98E-05 3. 16F-05 2.51F-05 2.O0E-O5 1.58E-05 3.04E-03 7.10E-03 2.23E-02 4.77F-02 8.42F-02 1 .46E-01 2.22E-01 3.50E-01 5.30E-01 7.46F-01 1.01F+00 1.26E+00 1 .57F+00 1.87E+00 2. 19E+00 2.52F+00 2.82E+00' 3. 11E + 00 3.43 c +00 3.70E+00 3.97E+00 4.22E+00 4.46E+00 4.74F+00 5.02E+00 5.26E+00 5.47E+00 5.65E+00 5.81F+00 5.99E+00 6. I4E+00 6.25E+00 6.38E+00 6.52E+00 6.60E+00 6.68E+00 6.71E+00 6.75E+00 6.78F+00 6.82E+00 6.85F+00 6.85E+00 6.88E+00 6.88E+00 6.88F+00 6.88F+00 6.89E+00 O.OOF+00 O.riOE + 00 9.62E-03 1.44F-02 1.92E-02 4.33F-0? 1 . 11F-01 3.75E-01 7.93E-01 1. 18E + 00 1.63F+00 1.92F+00 2. 3 3 E +00 2.75E+00 3. 18F+00 3.59E+00 3.90E+00 4.30E+00 4. 6 7 F +00 5.01E+00 5.26E+00 5.58E+00 5.91F+00 6.32F+00 6.72F+00 7.24E+00 7.67E+00 7.92E+00 8.20E+00 8.54F+00 8.88E+00 9. 10F+00 9.44F+00 9.76E+00 9.94E+00 1.01F+01 1 .02F + 01 1.03F+01 1 .04E + 01 1.05E+01 1.06F+01 1.06E+01 1.06E+01 1.06F+01 1.06E+01 1.06E+01 1.07E+01 8.96E-03 1.79E-02 3.58E-02 4.93F-02 6.72F-02 1.30E-01 1.70E-01 2.33F-01 3.23E-01 5. 38F-01 7.44E-01 9.45F-01 1.24E+00 1.56E+00 1.87E+00 2.21E+00 2.41E+00 2.66E+00 ;>.97E+00 3.29E+00 3.S3E+00 3.83E+0O 4.01E+00 4.26F+00 4.46E+00 4.61E+00 4.74E+00 4.92E+00 5.01E+00 5. 13E+00 5.19E+00 5.22E+00 5.25E+00 5.33E+00 5.37E+00 5.38F+00 5.40E+00 5.41E+00 5.43E+00 5.45F+00 5.47E+00 5.47E+00 5.48E+00 5.48E+00 5.48E+00 5.48E+00 5.49E+00 O.OOE+OO O.OOE+OO O.OOE+OO 9.26F-03 5.56E-02 1.57E-01 2.55E-01 3.47E-01 4.54E-01 5.93E-01 7.69E-0 1 9.81F-01 1.26E+00 1 .45E+00 1.79F+00 2.25F+00 2.69E+00 3.06E+00 3.46E+00 3.77E+00 4. 14E + 00 4.42E+00 4.64E+00 S.01E+00 5.36E+00 5.S6E+00 5.83F+00 6.01E+00 6.22E+0O 6. 33E+00 6.50E+00 6.66F+00 6.75E+00 6.90F+00 6.99E+00 7. 12E+00 7. 16E + 00 7. 18E+00 7.22E+00 7.25E+00 7.26E+00 7.26E+00 7.32E+00 7. 32E+00 7.32E+00 7.32E+00 7.33E+00 4.48E-03 1. 34E-0? 5.38E-02 1.25F-01 2.06F-01 2.H7E-01 4.12E-01 5.47E-01 6.81F-01 8.33F-01 1 .04E + 00 1.20E+00 1 .44E+00 1.68E+00 1.90E+00 2.07E+00 2.34E+00 2.57E+00 2.80E+00 2.94E+00 3.09E+00 3.24E+00 3.40E+00 3.56E+00 3.69E+00 3.86E+00 3.95E+00 4.09E+00 4.16E+00 4. 35E+00 4.37E+00 4.45E+00 4.54E+00 4.62E+00 4.67E+00 4.74E+00 4.74E+00 4.75E+00 4.75E+00 4.75E+00 4.76E+00 4.76E+00 4.76E+00 4.76E+00 4.76E+00 4.76E+00 4.76E+00 O.OOF+00 O.OOE+OO O.OOF+00 2.60E-02 5.Z1F-02 6.94F-02 9.55E-02 1.56E-01 3.04E-01 4.86E-01 7.64E-01 1.29E+00 1 .70E + 00 2.O3E+00 2.31E+00 2.60E+00 2.80E+00 2.99E+00 3.24F+00 3.51E+00 3.84E+00 4.09E+00 4.42E+00 4.64E+00 4.95E+00 5.07F+00 5.16E+00 5.33E+00 5.51E+00 5.62E+00 5.76E+00 5.83E+00 5.91E+00 5.93E+00 5.98E+00 5.99F+00 6.02F+00 6.02E+00 6.04E+00 6.07E+00 6.07E+00 6.07E+00 6.08E+00 6.08E+00 6.08E+O0 6.09E+00 6.09E+00 OPFRflT ION TIMF (MIN) 1971 18 41 598 44640 43200 44640 2 3 040 -CORRECTED SEPTEMBER 1973 ■46- TABLF 28. FREOUENCIFS OF 2-MINUTE AVERAGE PRECIPITATION RATES FOR THE 2-GAGE (3. 7-MILE) EAST-WEST LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLC 1 RATF (MM/MIN) ALL DATA APR MAY JUN JUL AUG l.OOF+00 2.04E-03 O.OOF+00 O.OOE+OO O.OOE+OO 8.96E-03 O.OOE+OO 7.94E-01 7.12E-03 O.OOF+00 O.OOE+00 O.OOE+00 3. 14E-02 O.OOE+OO 6.31E-01 2.65E-02 O.OOE+00 1.34E-02 O.OOE+OO 1.03E-01 O.OOE+00 5.01E-01 4.17E-02 O.OOE+00 2.24E-02 O.OOE+00 1.48E-01 2.60E-02 3.98E-01 6.31E-02 9.76E-03 4.48E-02 4.63E-03 1.93E-01 5.21E-02 3. 16E-01 9.57F-02 2.93E-02 8.51E-02 2.31F-02 2.33E-01 1.04E-01 2.51E-01 1 .26E-01 4.88E-02 1.30E-01 3.70E-02 2.78E-01 1.30E-01 1.99F-01 1.64E-01 8.30F-02 1.79E-01 6.48E-02 3.32E-01 1.39E-01 1.58E-01 2.22E-01 1.56E-01 2.46E-01 6.94E-02 4. 30 E -0 1 1.74E-01 1.26E-01 3.04E-01 3.37F-01 2.73E-01 1. 1 1E-01 b. 11 E-01 2.69E-01 l.OOE-01 4.56E-01 7.47E-01 3.45E-01 1.67E-01 5.69E-01 4.77E-01 7.94E-02 6.38F-01 1.09E+00 4.35E-01 3.61E-01 6. 36F-01 7.47E-01 6.31F-02 8.85E-01 1.5KE+00 6.32E-01 6.11F-01 7.08E-01 9. 98 E-01 5.01E-02 1.09E+00 1.95E+00 8.47F-01 7.55E-01 7.66E-01 1.26E+00 3.98E-02 1.30E+00 2.33E+00 9.95E-01 1.05E+00 8.02E-01 1.49E+00 3.16E-02 1.53E+0O 2".66E + 00 1. 16E + 00 1. 34E+00 8.83F-01 1.84E+00 2.51F-02 1.77E+00 3. 10E + 00 1.31E+00 1.59E+00 1 .03E + 00 2.07E+00 1.99E-02 1.96E+00 3.42E+00 1.38E+00 1.R4E+00 1. 13E+00 2.32E+00 1 .5SE-02 2. 15E+00 3.83E+00 1.46E+00 2.09E+00 1 .2 1E+00 2.48E+00 1.26F-02 2.34E+00 4.29F+00 1.57E+00 2.23E+00 1.27E+00 2.60E+00 l.OOE-02 2.48E+00 4.66F+00 1 .64E+00 2.38E+00 1.32E+00 2.67E+00 7.94F-03 2.62E+00 4.85F+00 1.72E+00 2.57E+00 1.37E+00 2.90F+00 6.31E-03 2.74E+00 5.23E+00 1.74E+00 2.71E+00 1 .40F+00 2.93E+00 5.01E-03 2.R5E+00 5.51E+00 1.78E+00 2.79E+00 1 .45E+00 2.99E+00 3.98E-03 2.92E+00 5.64F+00 1.80E+00 2.92E+00 1 .47E + 00 3.0RE+00 3. 16F-03 3.02E+00 5.90F+00 1.81E+00 3.07E+00 1.50F+00 3.08E+00 2.51E-03 3.0BE+00 6.09E+00 1 .86F + 00 3.10E+00 1 .53E+00 3.09E+00 2.00E-03 3.16E+00 6.41E+00 1.87E+00 3. 14E+00 1.54F+00 3.09F+00 1.58E-03 3.22E+00 6.62F+00 1 .8SE + 00 3.16E+00 1 ,t>5F+00 3. 16F+00 1.26E-03 3.28E+00 6.86E+00 1.88F+00 3. 16E + 00 1.56F+00 3. 16F + 00 1.00E-03 3.30F+00 6.97F+00 1 .88F + 00 3.16E+00 1.56E+00 3. 17E+00 7.94E-04 3.31E+00 6.99E+00 1.89E+00 3. 16F+00 1. 56E+00 3. 17E+00 6.31E-04 3.32E+00 7.06E+00 1.89F+00 3.16E+00 1.66E+00 3.17E+00 5.01E-04 3.34F+00 7.07F+00 1.90F+00 3.21E+00 1.5AE+00 3. 17E+00 3.98E-04 3.35F+00 7. 1 1F+00 1.90E+O0 3.21E+00 1 .S6F+00 3.19F+00 3. 16E-04 3.35E+00 7. 1 1F + 00 1.90E+00 3.21F+00 1.56E+00 3. 19E + 00 2.51E-04 3.36E+00 7. 1HE+00 1 .90E + 00 3.22E+00 1.56E+00 3. 19E + 00 2.00E-04 3.37E+00 7.20E+00 1.90E+00 3.22F+00 1 . 59E+00 3. 19F + 00 1.58F-04 3.37F+00 7.20F+00 1.90E+00 3.22E+00 1.59E+00 3. 19F + 00 1.26E-04 3.37F+00 7.20F+00 1.90E+00 3.22E+00 L.59E+00 3. 19F + 00 1.00E-04 3.41F+00 7.28E+00 1.90E+00 3.23F+00 1 .6SE+00 3. 19E + 00 OPERATION 196506 409 8 6 44640 4 3? on 44640 23040 TIME (MIN) -CORRECTFI) SEPTEMBER 1973 -47- TABLE 29. FREQUENCIES OF 2-MINUTF AVEKAGF PREC I P I T A T I ON RATES FOR THF 4-GAGE (9.4-MILE) EAST-WEST LINE riF GAGES IN CENTRAL ILLINOIS, PROP APRIL 1 THRMUGH AUGUST 16, 1970 THRESHOLD RA TE ( MM/ HI N) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 7.94E-01 6.31E-01 S.OIE-Ol 3.98E-01 3.16E-01 2.51E-01 1.99E-01 1.58E-01 1.26E-01 l.OOE-Ol 7.94E-02 6.31E-02 6.01F-02 3.98E-0? 3.16F-02 2.51E-02 1.99E-02 1.58E-02 1.26E-02 1.00E-02 7.94E-03 6.31E-03 5.01E-03 3.98E-03 3.16E-03 2.51F-03 2.00E-03 1.58E-03 1.26E-03 l.OOE-03 7.94E-04 6.31E-04 5.01F-04 3.98F-04 3.16E-04 2.51E-04 2.00E-04 1.58E-04 1.26E-04 1.00E-04 7.94F-05 6.31E-05 5.01E-05 3.98E-05 3.16E-05 2.02E-03 1.21F-02 2.93E-02 5.25E-02 8.68E-02 1.24E-01 1.64E-01 2.11F-01 3.19E-01 4.76F-01 6.99E-01 9.34F-01 1.14E+00 1.38E+00 1.66E+00 1.95E+00 2.22E+00 2.45E+00 2.66E+00 2.82E+00 3.01E+OO 3.20E+00 3.34E+00 3.47E+00 3.58E+00 3.67E+00 3.75E+0O 3.84E+00 3.96E+00 4.00E+00 4.07E+00 4. 12E+00 4.13E+00 4.16E+00 4.17E+00 4.18E+00 4.19E+00 4.21E+00 4.21E+00 4.21E+00 4.21E+00 4.23E+00 4.25E+00 4.25E+00 4.27E+00 O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 2.3SE-02 4.70E-02 1.03E-01 1.64E-01 3.90E-01 7.33F-01 1. 19E+00 1.63F+O0 2.04F+00 2.45E+00 2.87E+00 3.40E+00 3.85E+00 4.26E+00 4.65F+00 4.93E+00 5.22E+00 5.60E+00 5.93E+00 6.27E+00 6.46E+00 6.74F+00 6.88E+00 7.09E+00 7.51E+00 7.67F+00 7.96E+00 8.17E+00 8.22E+00 8.30E+00 8.31E+00 8.31E+00 8.37E+00 8.39E+00 8.39E+00 8.40F+00 8.40E+00 8.40E+00 8.48E+00 8.48E+00 8.56F+00 4.48E-03 2.24E-02 6.27E-02 9.86E-02 1.25E-01 1.66E-01 2.O6E-01 2.51E-01 3.36E-01 4.35E-01 5.42F-01 8.02E-O1 9.59F-01 1.16E+00 1.34E+00 1.47E+00 1.60E+00 1.73E+00 1.88E+00 1.95E+00 2.07E+00 2.20E+00 2.23E+00 2.31E+00 2.34E+00 2.39E+00 2.42E+00 2.49E+00 2.51E+00 2.52E+00 2.53E+00 2.53E+00 2.53E+00 2.53E+00 2.53E+00 2.54E+00 2.54E+00 2.54E+00 2.54E+00 2.55E+00 2.55E+00 2.55E+00 2.55E+00 2.55E+00 2.55E+00 O.OOE+OO O.OOE+OO O.OOE+OO 4.63E-03 9.26E-03 4.63E-02 6.48E-02 9.26E-02 1.25E-01 1.76E-01 3.43E-01 4.91E-01 6.48E-01 8.89E-01 1.30E+00 1.68E+00 2.00E+00 2.29E+00 2.52E+00 2.74E+00 2.97E+00 3.20E+00 3.38E+00 3.46E+00 S.SBE+OO 3.64F+00 3.76E+00 3.84E+00 3.92E+00 3.93E+00 3.94E+00 3.94E+00 3.95E+00 4.01E+00 4.01E+00 4.03E+00 4.04E+00 4.07E+00 4.07E+00 4.07E+00 4.07F+00 4.08E+00 4.08E+00 4.08E+00 4.G9E+00 4.48E-03 3.14E-02 6.27E-02 1.16E-01 1.93E-01 2.46E-01 2.91E-01 3.54E-01 4.30E-01 5.20E-01 6.00F-01 6.85E-01 7.75E-01 9.14E-01 1.02E+00 1.19E+00 1.33E+00 1.43E+00 1.49E+00 1.56E+00 1.75E+00 1.82E+00 1.89F+00 1.9bE+00 1.98F+00 2.03E+00 2.07E+00 2.08E+00 2. 10E+00 2.1 1E+00 2. 12E+00 2. 12E + 00 2. 13E+00 2. 16E + 00 2. 16E+00 2.16E+00 2. 17E+00 2.18E+00 2. 18E+00 2.18E+00 2. 18E+00 2.27E+00 2.27E+00 2.27E+00 2.27E+00 O.OOE+OO O.OOE+OO 8.68E-03 2.60E-02 6.94E-02 9.55E-02 1.30E-01 1.65E-01 3.04E-01 5.S6E-01 9.55E-01 1.22E+00 1.46F+00 1.68E+00 1.95E+00 2.15E+00 2.53E+00 2.80E+00 3.02E+00 3.21E+00 3.30E+00 3.39E+00 3.48E+00 3.52E+00 3.73E+00 3.76E+00 3.81E+00 3.85E+00 3.85E+00 3.87E+00 3.87E+00 3.88E+00 3.88E+00 3.88E+00 3.88E+00 3.88E+00 3.89E+00 3.89E+00 3.89E+00 3.89E+00 3.89E+00 3.89E+00 3.89E+00 3.89E+00 3.89E+00 OPFRATION TIMF (MIN) 198090 42570 44640 43200 44640 23040 -CORRECTED SEPTEMBER 1973 -48- TABLE 30. FREQUENCIES OF 2-MINUTE AVERAGE PRECIPITATION RATES FOR THE 6-GAGE (14.9-MILF) EAST-WEST LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATF (MM/MIN) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 6.31E-01 5.01E-01 3.98E-01 3.16E-01 2.51E-01 1.99E-01 1.58E-01 1.26E-01 1.00E-01 7.94E-02 6.31F-02 5.01F-02 3.98E-02 3.16E-02 2.51E-02 1.99E-02 1.58E-02 1.26E-02 1.00E-02 7.94E-03 6.31E-03 5.01E-03 3.98E-03 3.16E-03 2.51E-03 2.00E-03 1.58E-03 1.26F-03 1.00E-03 7.94F-04 6.31E-04 5.01E-04 3.98E-04 3. 16F-04 2.51F-04 2.00E-04 1.58E-04 1.26E-04 1.00F-04 7.94E-05 6.31F-05 5.01E-05 3.98E-05 3. 16E-05 2.51F-05 2.00E-05 1.58E-05 4.05E-03 1.32E-02 3.85E-02 6.49E-02 1.04F-01 1.64E-01 2.32E-01 3.44E-01 4.8RE-01 6.87E-01 9.73F-01 1. 18E+00 1 .36E+00 1.64E+00 1.95E+00 2.21E+00 2.49F+00 2.70E+00 2.88E+00 3.03E+00 3.21E+00 3.39E+00 3.55E+00 3.70E+00 3.82E+00 3.95E+00 4.05E+00 4. 14E+00 4.24E+00 4.32E+00 4.36E+00 4.40E+00 4.43E+00 4.45E+00 4.49E+00 4.50E+00 4.52E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.53E+00 4.56E+00 4.57E+00 4.57E+00 4.57E+00 4.57F+00 O.OOE+OO O.OOE+00 4.78E-03 2.39F-02 5.26E-02 l.OOE-01 1.96E-01 4.35E-01 8.17E-01 1. 15F+00 1.58E+00 1.91E+00 2.21E+00 2.66F+00 3.10E+00 3.42E+00 3.74E+00 3.93E+00 4.23E+00 4.52E+00 4.R5E+00 5. 13E+00 5.48E+00 5.85E+00 6.20F+00 6.51E+00 6.78E+00 6^99E+00 7.19E+00 7.42E+00 7.55E+00 7.69E+00 7.80F+00 7.86E+00 7.93F+00 8.00E+00 8.06E+00 8.08F+00 8.08E+00 8.08F+00 8.08E+00 8.08E+00 8.08E+00 8. 12E+00 8.13E+00 8. 136+00 8.13E+00 1.34E-02 4.03E-02 9.86E-02 1.34E-01 1.79E-01 2.51E-01 3.23E-01 3.90E-01 4.57E-01 6.32E-01 8.83E-01 1.09E+00 1.24E+00 1.42E+00 1.58E+00 1.77E+00 2.06E+00 2.21E+00 2.33E+00 2.43E+00 2.52E+00 2.71E+00 2.82E+00 2.91E+00 2.97E+00 2.99E+00 3.03E+00 3.06E+00 3.10E+00 3. 10E+00 3.12E+00 3. 13E+00 3.14E+00 3.15E+00 3.16E+00 3.16E+00 3.17E+00 3. 17E+00 3.17E+00 3. 17E+00 3.17E+00 3.17E+00 3.17E+00 3. 18E+00 3.18E+00 3. 18E+00 3.18E+00 O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+OO 4.63E-03 3.24E-02 6.94E-02 8.80E-02 1.76E-01 3.38E-01 5.69E-01 7.08E-01 8.84E-01 1.24E+00 1 .69E+00 2.07E+00 2.48E+00 2.77E+00 3.02E+00 3.21E+00 3.43E+00 3.59E+00 3.77E+00 3.90E+00 3.98E+00 4.05E+00 4.12E+00 4.20E+00 4.30E+00 4.38E+00 4.41E+00 4.41E+00 4.41E+00 4.43E+00 4.50E+00 4.50E+00 4.53E+00 4.54E+00 4.54E+00 4.54E+00 4.54E+00 4.54E+00 4.55E+00 4.55E+00 4.55E+00 4.56E+00 4.56E+00 4.48E-03 1.79E-02 6.72E-02 1.21E-01 1.97E-01 2.78E-01 3.58E-01 4.48E-01 5.20E-01 6. 18E-01 7.62E-01 8.69E-01 9.72E-01 1. 10E+00 1.31E+00 1.44E+00 1.56E+00 1.67E+00 1.76E+00 1.81E+00 1.88E+00 2.02E+00 2.09E+00 2. 16E+00 2.21E+00 2.29E+00 2.36E+00 2.45E+00 2.52E+00 2.54E+00 2.58E+00 2.59E+00 2.61E+00 2.62E+00 2.64E+00 2.64E+00 2.64E+00 2.64E+00 2.64E+00 2.64E+00 2.64E+00 2.64E+00 2.73E+0O 2.73E+00 2.73E+00 2.73E+00 2.73E+00 O.OOE+00 O.OOE+00 O.OOE+00 1.74E-02 6.08E-02 1.39E-01 1.82E-01 3.65E-01 4.77E-01 7.47E-01 1.21E+QD 1.51E+00 1.74E+00 2.01E+00 2.31E+00 2.61E+00 2.85E+00 3.24E+00 3.41E+00 3.57E+00 3.73E+00 3.78E+00 3.85E+00 3.96E+00 3.97E+00 4. 17E+00 4.20E-+00 4.25E+00 4.32E+00 4.33E+00 4.36E+00 4.36E+00 4.37E+00 4.37E+00 4.37E+00 4.37E+00 4.37E+00 4.37E+00 4.37E+00 4.37E+00 4.38E+00 4.38E+00 4.38E+00 4.38E+00 4.38E+00 4.38E+00 4.38E+00 OPERATION TIMF (MINI 197372 41852 44640 43200 44640 23040 -CORRECTED SEPTEMBER 1973 -49- TABLE 31. FREQUENCIES OF 2-MINUTE AVERAGE PRECIPITATION RATES FDR THE 8-GAGE (21.2-MILE) EAST-WEST LINE (IF GAGES IN CENTRAL ILLINOIS, FROK APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATE ( MM/ MI N) PERCENT OF TIME THAT RATE IS GREATER THAN THRFSHOLD ALL DATA APR MAY JON JUL AUG 5.01F-01 3.98E-01 3. 166-01 2.51E-01 1.99E-01 1.58E-01 1.26F-01 l.OOE-01 7.94E-02 6.31E-02 5.01E-O2 3.98E-02 3.16E-02 2.51E-02 1.99F-02 1.58E-02 1.26F-02 l.OOF-02 7.94F-03 6.31 F-03 5.01E-03 3.98F-03 3.16E-03 2.51F-03 2.00E-03 1.58E-03 1.26F-03 1 .OOE-03 7.94E-04 6.31E-04 5.01E-04 3.98F-04 3.16E-04 2.51E-04 2.00E-04 1.58E-04 1.26E-04 1.00F-04 7.94E-05 6.31E-05 5.01F-05 3.98E-05 3.16E-05 2.51E-05 2.00E-05 1.58E-05 1.26E-05 4.06E-03 2.43E-02 5.88E-02 1.08F-01 1.70E-01 2.68E-01 3.72E-01 5.39E-01 7.26E-01 9.61E-01 1.21E+00 1.48E+00 1.71E+00 2.00E+00 2.30E+00 2.54E+00 2.76E+00 2.99E+00 3.19E+00 3.41F+00 3.58E+00 3.79E+00 3.99E+00 4.17E+00 4.29E+00 4.43E+00 4.54E+00 4.63E+00 4.73E+00 4.80E+00 4.90E+00 4.94E+00 5.01E+00 5.04E+00 5.07E+00 5.09F+00 5. 13E+00 5. 13E+00 5.14E+00 5.14E+00 5.14E+00 5.14F+00 5.15E+00 5.17E+00 5.17E+0O 5.17E+00 5.17E+00 4.80E-03 1.44E-02 1.92F-02 1.01E-01 1.63E-01 2.98E-01 4.56E-01 8.94E-01 1.23E+00 1.66E+00 2.07E+00 2.43E+00 2.83E+00 3.18F+00 3.55E+00 3.77E+00 4.02E+00 4.30E+00 4.S9F+00 5.02E+00 b.30E+00 5.59F+00 6.04E+00 6.47E+00 6.75E+00 7.11F+00 7.40E+00 7.60E+00 7.79E+00 8.O3E+00 8.25E+00 8.39E+00 8.69E+00 8.S0E+00 8.88E+00 8.89E+00 9.01E+00 9.03E+00 9.05E+00 9.05E+00 9.05E+00 9.05E+00 9.05E+00 9.09E+00 9.09E+00 9.10F+00 9.10E+00 1.34E-02 6.72E-02 1.30E-01 1.97E-01 2.55F-01 3.41E-01 4.21E-01 5.02E-01 6. 14E-01 8.56E-01 1.10E+00 1.31E+00 1.52E+00 1.70E+00 1.96E+00 2.19E+00 2.37E+00 2.61E+00 2.72E+00 2.86F+00 2.94F+00 3.14E+00 3.2bE+00 3.32F+00 3.36E+00 3.42E+00 3.45F+00 3.49E+00 3.56E+00 3.56E+00 3.60E+00 3.63E+00 3.64E+00 3.66E+00 3.67E+00 3.67E+00 3.67E+00 3.68E+00 3.68E+00 3.68E+00 3.68F+00 3.68E+00 3.68E+00 3.68E+00 3.68E+00 3.68E+00 3.68E+00 O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00 2.78E-02 8.33E-02 1.67E-01 2.45E-01 4.44E-01 5.88E-01 7.92E-01 1.05E+00 1.24E+00 1 .64E+00 2.05E+00 2.47E+00 2.84E+00 3.07E+00 3.33E+00 3.53F+00 3.71F+00 3.94E+00 4. 18E+00 4.32E+00 4.43E+00 4.52E+00 4.61E+00 4.69E+00 4.75E+00 4.84E+00 4.91E+00 4.94E+00 4.96E+00 4.97E+00 4.99E+00 5.04E+00 5.09E+00 5.09F+00 5. 10E+00 5.10E+00 5. UE + OO 5.11E+00 5.11E+00 5.12E+00 S. 12E+00 S.12E+00 5.12E+0O O.OOE+OO 2.69E-02 1. 12E-01 1.75E-01 2.78E-01 3.76E-01 4.61E-01 5.65E-01 6.59E-01 7.48E-01 8.60E-01 9.81E-01 1.09E+00 1.26E+00 1.43E+00 1.55E+00 1.67E+00 1.78E+00 1.91E+00 2.05E+00 2. 15E+00 2.28E+00 2.37E+00 2.49E+00 2.58E+00 2.65E+00 2.69E+00 2.75E+00 2.83E+00 2.85F+00 2.93F+00 2.93F+00 2.94E+00 2.95E+0O 2.96E+00 2.97F+00 2.97E+00 2.97E+00 2.97E+00 2.97E+00 2.97E+00 2.97E+00 3.00E+00 3.06E+00 3.06E+00 3.06E+00 3.06E+00 O.OOE+OO O.OOE+00 O.OOE+OO 1.74E-02 7.81E-02 2.08E-01 3.39E-01 4.69E-01 6.86E-01 1.02E+00 1.35E+00 1.83E+00 2. 17E + 00 2.53E+00 2.86E+00 3.06E+00 3.26E+00 3.54E+00 3.79E+00 4.00E+00 4.26E+00 4.44E+00 4.53F+00 4.63E+00 4.69E+00 4.77E+00 4.94E+00 5.03E+00 5. 10E+00 5. 10E+00 5. 13E+00 5.13E+00 5. 13E + 00 5.14E+00 5. 15E + 00 5.15E+00 5. 16E+00 5.16E+00 5.16E+00 5.17E+00 5. 17E+00 5.17E+00 5. 17E + 00 5.17E+00 5. 17E + 00 5.17E+00 5.17E+00 OPFRAT ION TIMF (MIN) 197146 41626 44640 43200 44640 23040 -CORRECTED SEPTEMBER 1973 •50- TABLB 32. FRFOUEiMCIES OF 2-MINUTE AVERAGE PRECIPITATION RATES FOR THE 10-GAGE (26.9-MILE) EAST-WEST LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRFSHOLD RATF (MM/MIN) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 5.01E-01 3.98E-01 3.16E-01 2.51F-01 1 .99F-01 1.58F-01 1.26F-01 l.OOE-01 7.94E-02 6.31E-02 5.01F-02 3.9RF-02 3.16F-02 2.51F-02 1.99F-02 1 .58F-02 1 .26F-02 l.OOF-02 7.94F-03 6.31F-03 5.011-0 3 3.98F-03 3.16E-03 2.51F-03 2.00F-03 I . 58F- 03 1.26F-03 1.00F-03 7.94F-04 6.31F-04 5.01 f -04 3.98F-04 3.16F-04 2.51F-04 2.00E-04 1.58F-04 1 .26F-04 1.00F-04 7.94F-05 6.31F-0S 5.01 F-05 3.98F-05 3.16F-0 5 2.51F-0S 2.O0F-05 1.5HF-05 1.26F-0S 3.05E-03 1.62E-02 3.76E-02 9.14E-02 1.61E-01 2.61E-01 3.75F-01 5.37E-01 7.14E-01 9.48E-01 1.21E+00 1.52E+00 1.78F+00 2.03E+00 2.32E+00 2.60E+00 2.R7F+00 3.10E+00 3.37E+00 3.63E+00 3.87E+00 4.08E+00 4.28F+00 4.49E+00 4.66E+00 4.79E+00 4.93F+00 5.08F+00 5.21 E+00 5.31E+00 5.41E+00 5.48E+00 5.54F+00 5.61F+00 5.65E+00 5.69F+00 5.70F+00 5.72E+00 5.73F+00 5.74E+00 5.74E+00 5.75E+00 5.75F+00 5.76E+00 5.78F+00 5.78E+00 5.78F+00 1.45E-02 2.41E-02 2.89F-02 6.27E-02 1.69F-01 3.04F-01 5.01E-01 8.63E-01 1.22E+00 1.67E+00 2.14E+00 2.66E+00 2.93^+00 3.27F+00 3.56F+00 3.85E+00 4.12F+00 4.52F+00 4.75E+00 5.06F+00 5.45E+00 5.77E+00 6.13E+00 6.53E+00 6.86E+00 7. 17E+00 7.62E+00 8.00E+00 8.24E+00 8.44E+00 8.65F+00 8.82E+00 8.89F+00 9. 19E+00 9.31F+00 9.40E+00 9.41F+00 9.47E+00 9.47E+00 9.48F+00 9.48E+00 9.48E+00 t >.48E+00 9.48F+00 9.53F+00 9.53E+00 9.53E+00 O.OOE+OO 3.58E-02 9.41E-02 1.88E-01 2.64E-01 3.32E-01 3.94F-01 4.79F-01 5.73E-01 7.75E-01 1 .03E + 00 1.33F+00 1 .58F + 00 1.76E+00 1.98F+00 2.23F+00 2.47E+00 2.61E+00 2.86E+00 3.02E+00 3.20E+00 3.36E+00 3.52E+00 3.70E+00 3.82E+00 3.89E+00 3.92E+00 3.98E+00 4.05F+00 4. 12E+00 4.14E+00 4. 18F + 00 4.26F+00 4.27E+00 4.28F+00 4.29E+00 4.29F+00 4.30F+00 4.30E+00 4.31E+00 4.31E+00 4.31E+00 4.31F+00 4.31E+00 4.31F+00 4.31F+00 4.31F+00 O.OOE+OO O.OOE+OO O.OOE+OO 9.26E-03 5.09E-02 1. 16E-01 1.67E-01 3.01E-01 4.77E-01 6.71E-01 8.75E-01 1. 10E+00 1.36E+00 1.63F+00 2.12E+00 2.52E+00 2.96E+00 3.26F+00 3.62E+00 3.94E+00 4.20E+00 4.42E+00 4.56E+00 4.76E+00 4.89E+00 4.95E+00 5.04E+00 5. 13E+00 5.26E+00 5.33E+00 5.43E+00 5.49E+00 5.55E+00 5.56F+00 5.59E+00 5.61E+00 5.66E+00 5.69F+00 5.71E+00 5.71E+00 5.72F+00 5.73F+O0 5.73E+00 5.73F+00 5.73E+O0 5.73E+00 5.73E+00 O.OOE+OO 1.34E-02 4.48E-02 1.48E-01 2.28E-01 3.58E-01 4.53E-01 5. 38E-01 6.41E-01 7.12E-01 7.97F-01 9.27E-01 1.06E+00 1.22E+00 1.38E+00 1.55E+00 1.73E+00 1.85E+00 2.03E+00 2.22E+00 2.38E+00 2.47E+00 2.60E+00 2.71 E+00 2.80E+00 2.8S*F + 00 2.95E+00 3.02E+00 3.09F+00 3. 19E+00 3.22F+00 3.29E+00 3. 3 1 E + 00 3.31E+00 3.34F+00 3. 35F+00 3. -16E+00 3. 36E+00 3.36F+00 3.36E+00 3.36F+00 3. 37 E+00 3.37E+00 3.40F+00 3.45E+00 3.45E+00 3.45E+00 O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 2.60E-02 1.30E-01 3.47E-01 5.03E-01 6.51E-01 9.64E-01 1.31F+00 1.80E+00 2.31E+00 2.66E+00 2.93E+00 3.23E+00 3.42E+00 3.65F+O0 4.03E+00 4.36E+00 4.57E+00 4.92E+00 5.14E+00 5.30E+00 5.48E+00 5.60E+00 5.72E+00 5.87F+00 5.97E+00 6.03E+00 6.21E+00 6.25E+00 6.31E+00 6.34F+00 6.35E+00 6.36E+00 6.36E+00 6.39E+00 6.40E+00 6.40E+00 6.45E+00 6.4i>F + 00 6.48F+00 6.48F+00 6.48F+00 6.48F+00 6.48F+00 (1PFRAT KIM TIMF (MINI 1^7010 41490 44640 43200 44640 23040 -CORRFCTED SEPTEMBER 1973 -51- TABLE 33. FREQUENCIES OF 2-MINUTE AVERAGE PREC I P I T AT I ON RATES FOR THE 12-GAGE (33.3-MILE) EAST-WEST LINE OF GAGES IN CFNTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATF (MM/MIN) PERCENT OF TIMF THAT RATE IS GREATER THAN THRESHOLD ALL DATA APR MAY JUN JUL AUG 5.01E-01 3.98E-01 3.16E-01 2.51E-OI 1.99F-01 1.58E-01 1.26E-01 l.OOE-01 7.94E-02 6.31E-02 5.01E-02 3.9HF-02 3.16F-02 2.S1F-02 1.99E-02 1.5HE-02 1.26E-02 l.OOF-02 7. 94 E -0 3 6.31F-03 5.01F-03 3.98E-03 3.16F-03 2.51E-03 2.00F-03 1.58E-03 1.26F-03 1 .OOE-03 7.94E-04 6.31E-04 5.01 : -04 3.98E-04 3.16E-04 2.51E-04 2.00E-04 1.58F-04 1.26E-04 1.00E-04 7.94E-05 6.31F-05 5.01E-05 3.98E-05 3.16F-05 2.51h-0S 2.00E-05 1.58E-0b 1.26E-05 1. OOF-OS 1.02E-03 1.62E-02 3.45F-02 5.99E-02 1 .39F-01 2.30E-01 3.42F-01 5. 16F-01 7.21F-01 9.51E-01 ] .21F + 00 1.51E+00 1.R7E+00 ?. 10E+00 2.41F+00 2.72E+00 3.02E+00 3.34E+00 3.64F+00 3.97E+00 4.23E+00 4.48E+00 4.71F+00 4.91E+00 5. 14E+00 5.33E+00 5.49E+00 5.61E+00 5.74E+00 5.86E+00 5.97E+00 6.05E+00 6. 14E+00 6.19E+00 6.27E+00 6.32E+00 6.35E+00 6.36F+00 6.37F+00 6.3RF+00 6.3RF+00 6.39E+00 6.39F+00 6.39E+00 6.40E+00 6.42E+00 6.42E+00 6.42E+00 O.OOF+OO 2.41F-02 2.90E-02 3.38E-02 1.54E-01 2.90E-01 4 . 6 3 F -0 1 7.97E-01 1.22E+00 1.66F+00 ? . 12F+00 2.63F+O0 3.02F+00 3.37E+00 3.67F+00 3.97F+00 4.23F+00 4.56F+00 4.99F+00 5.34E+00 5.62F+00 5.92E+00 6.31F+00 6.58E+00 7.00F+00 7.42F+00 7.77F+00 8. 13E+00 8.44E+00 8.64E+00 8.81F+00 8.99F+00 9. 17E + 00 9.29E+00 9.51F+00 9.62E+00 9.71E+00 9.7 1F+00 9.73F+00 9.73E+00 «.74F+00 9.74F+00 9.74F+O0 9.74F+00 9.74F+00 9.HOE+00 9.R0F+00 9.80F+00 4.48E-03 2.24E-02 7.17E-02 L.48F-01 2.46E-01 3.05E-01 3.81E-01 4.70E-01 5.73E-01 6.99E-01 9.77F-01 1.27F+00 1.54F+00 1.77F+00 1.99E+00 2.28F+00 2.57E+00 2.87F+00 3.07E+00 3.35E+00 3.54E+00 3.76E+00 3.94E+00 4. 15E+00 4.30E+00 4.45E+00 4.56F+00 4. 6] F+00 4.68E+00 4.74E+00 4.90E+00 4.91E+00 4.99E+00 5.03E+00 5.11F+00 5. 12E+00 5.13E+00 5. 13E+00 5.13E+00 5. 14F+00 5. 14E+00 5. 14E + 00 S.14E+00 5. I4E+00 5.15F+00 5. 15F + 00 5.15F+00 5. 15F+00 O.OOE+OO O.OOE+OO 4.63E-03 4.63E-03 3.24E-0? 1.30E-01 1.90E-01 2.92E-01 5.32F-01 7.64E-01 9.77E-01 1.23F+00 1 .54F+00 1.85E+00 2.40E+00 2.84E+00 3.20E+00 3.58E+00 3.90F+00 4.27F+00 4.60F+00 4.83E+00 5.03F+00 5.22E+00 5.45E+00 5.56E+00 5.67F+00 5.75E+00 5.84E+00 5.98E+00 6.0 1F+00 6. 11E+00 6.17E+00 6.20E+00 6.21 F + 00 6.25E+00 6.26E+00 6.31E+00 6.35F+00 6. 35F+00 6.36E+00 6.36E+00 6.37E+00 6.37F+00 6.37E+00 6.37F+00 6.37F+00 6. 37F+00 O.OOE+OO 2.69E-02 4.93E-02 8.06E-02 1 .R8E-01 2.H7E-01 4.08E-01 5.38F-01 6.14F-0 1 7.08F-01 7.89F-01 9.05F-01 1.08F+00 1.23F+00 1.41E+00 1.64F+00 1.86E+00 2.05F+00 2.24E+00 2.44E+00 2.62E+00 2.84E+00 2.94E+00 3. 11 E + 00 3.21E+00 3.32F+00 3.38F+00 3.46E+00 3.48E+00 3.57E+00 3.63F+00 3.64E+00 3.75E+00 3.77E+00 3.83F+00 3.86F+00 3.89E+00 3.90E+00 3.90F+00 3.90E+00 3.9OF+00 3.90E+00 3.90F+00 3.90F+00 3.93E+00 3.99F+00 3.99F+00 3.99F+00 O.OOE+OO O.OOE+OO O.OOE+OO O.OOF+OO 8.68E-03 5.21E-02 2.08F-01 4.77E-01 6.77E-01 9.90F-01 1.24F+00 1.65E+00 2. 18E + 00 2.57F+00 2.92E+00 3. 18E+00 3.61E+00 4. 11E + 00 4.57E+00 5.08E+00 5.49E+00 5.79E+00 6.11E+00 6.30E+00 6.55E+00 6.74E+00 6.91E+00 6.93E+00 7.12E+00 7.27E+00 7.36E+00 7.50E+00 7.52E+00 7.55E+00 7.56E+00 7.S8E+00 7.59E+00 7.59E+00 7.60E+00 7.62E+00 7. 62 E+00 7.62F+00 7.62E+00 7.62E+00 7.62F+00 7.62F+00 7.62F+00 7.62E+00 OPFH A I IHN TIMF < MIN) I 96946 41 426 44640 43200 44640 23040 -CORRECTED SFPTFMRFR 1973 .CI- TABLE 36. A SUMMARY OF THE FREQUENCIES OF 2-MINOT6 AVERAGF PRECIPITATION RATES FOR VARIOOS LENGTHS OF NORTH-SOUTH LIMES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD PE RCENT OF TIM F THAT RATE IS GR6AT6R T HAN THR6SHUL I) RATE (MM/MIN) 14-GAG6 12-GAGE 10-GAGE 8-GAGE 6-GAGE 4-GAGE 2-GAGE 1-GAG6 1. 266 + 00 O.OOE+00 O.OOF+OO O.OOE+OO O.OOE+OO 2.03F-03 2.026-03 2.046-03 3.036-03 l.OOE+00 O.OOE+00 O.OOE+00 O.OOF+OO 2.03E-03 4.05E-03 4.04E-03 4.07E-03 1.016-02 7.946-01 O.OOE+00 O.OOE+00 3.046-03 5.07E-03 8. 10E-03 9.086-03 1.22E-02 2.026-02 6.31E-01 1.02E-03 3.046-03 6.08E-03 R.11F-03 1.22E-02 1.41F-02 2.756-02 4.046-02 5.016-01 5.086-03 7. 10F-03 1.22F-02 1.426-02 2.03F-02 3. 136-02 4.686-02 6.576-02 3.98E-01 1.63E-02 2.23E-02 2.436-02 3.146-02 3.44E-02 5.856-02 7.136-02 8. 696-02 3.16F-01 3.76E-02 4. 776-02 5.37E-02 5.986-02 7. 496-02 8.376-02 9.886-02 1.10E-01 2.516-01 7.01E-0? 8.426-02 9.23E-02 1.10E-01 1.27E-01 1.246-01 1 .356-01 1.33E-01 1.99F-01 1.31E-01 1.466-01 1. 65F-01 1.736-01 1.72E-01 1.66E-01 1.706-01 1.746-01 1.58E-01 2.22F-01 2.22E-01 2.41E-01 2.21E-01 2.196-01 2.25E-01 2.096-01 2.296-01 1.26F-01 3.55E-01 3.506-01 3.56E-01 3.536-01 3.29F-01 3. 166-01 3. 17E-01 3.566-01 l.OOE-01 5.386-01 5.30E-01 5. 356-01 5.206-01 4.H8F-01 4.856-01 4.766-01 5.136-01 7.946-02 7.446-01 7.466-01 7.50E-01 7.556-01 7.086-01 6.966-01 6.736-01 7. 376-01 6.31E-02 1.02E+00 1.01E+00 1 .OOE+OO 9. -116-01 9. 186-01 9.106-01 8.886-01 9.20F-01 5.016-02 1.27F+00 1.26E+00 1.26F+00 1. 216+00 1. 156+00 1. 146 + 00 1. 13E+00 1. 156 + 00 3.9RF-02 1.57E+00 1.57E+00 1.54F+00 1 .506+00 1.416+00 1.406+00 1.366+00 1.38 6+0 3. 16E-02 1.92E+00 1.87E+00 1.83F+00 1.77E+O0 1.636+00 1.646+00 1.61E+00 1.586+00 2.51E-0? 2.26E+00 2. 19E+00 2.17E+00 2.086+00 1.946+00 1.886+00 1 .856+00 1.826+00 1.99E-02 2.596+00 2.526+00 2.46E+00 2.406+00 2.226+00 2. 156 + 00 2.056+00 2.04E+00 1.58F-02 2.916+00 2.82E+00 2.77F+00 2.67E+00 2.506+00 2.386+00 2.296+00 2.226+00 1.26F-02 3.26E+00 3.11E+00 3.046+00 2.92E+00 2.746+00 2.606+00 2.516+00 2.426+00 l.OOE-02 3.56E+00 3.436+00 3.3OE+O0 3.22E+00 2.976+00 2.816+00 2.706+00 2.566+00 7.94E-03 3.846+00 3.70F+00 3.56E+00 3.44E+00 3. 206+00 3.026+00 2.83F+00 2.676+00 6.316-03 4.136+00 3.97E+00 3.82E+00 3. 656+00 3.45E+00 3.226+00 2.956+00 2.806+00 5.01F-03 4.42E+00 4.226+00 4.066+00 3.89E+00 3.68E+00 3.38E+00 3.036+00 2.87E+00 3.986-03 4.69E+00 4.466+00 4.306+00 4. 12E + 00 3.88E+00 3.556+00 3.116+00 2.96E+00 3. 16F-03 4.99E+O0 4.746+00 4. 55E+00 4. 34E+00 4.05F+00 3.696+00 3. 176 + 00 3.046+00 2.516-03 5.326+00 5.02E+00 4.806+00 4.546+00 4.23F+00 3.816+00 3.24E+00 3.096+00 2.00E-03 5.606+00 5.266+00 5. OOE+OO 4.72F+00 4. 356+00 3.906+00 3.30E+00 3. 12E + 00 1.58E-03 5.S4E+00 5.476+00 5.196+00 4.90E+00 4.486+00 4.056+00 3.36E+00 3.13E+00 1.26E-03 6.08E+00 5.65E+00 5.346+00 5.066+00 4.596+00 4. 146+00 3.40E+00 3. 14E + 00 l.OOE-03 6.31F+00 5.816+00 5.486+00 5.15E+00 4.716+00 4.186+00 3.43E+00 3.166+00 7.946-04 6.496+00 5.996+00 5.57E+00 5.2 5E+00 4.806+00 4.296+00 3.43E+00 3. 166+00 6.316-04 6.636+00 6. 146+00 5.666+00 5.33E+00 4.896+00 4.366+00 3.45E+00 3.16E+00 5.016-04 6.75E+00 6.256+00 5.806+00 5.45E+00 5.026+00 4.406+00 3.46E+00 3. 196+00 3.986-04 6.R8E+00 6.38F+00 5.93E+00 5.50E+00 5.08E+00 4.52E+00 3.476+00 3. 196 + 00 3.16E-04 6.97E+00 6.52E+00 6.01E+00 5.606+00 5. 106+00 4. 546+00 3.476+00 3. 196+00 2.51E-04 7.08E+00 6.60E+00 6.12F+00 5.686+00 5.14E+00 4.556+00 3.496+00 3. 196+00 2.006-04 7. 15E+00 6.68E+00 6. 156+00 5.726+00 5. 196+00 4.58E+00 3.49E+00 3.216+00 1.586-04 7.20E+00 6.71E+00 6.17E+00 5.776+00 5.20E+00 4.596+00 3.49E+00 3.216+00 1. 266-04 7.256+00 6.756+00 6.22E+00 5.77E+00 5.226+00 4.596+00 3.496+00 3.216+00 1.00E-04 7.296+00 6.786+00 6.22E+00 5.776+00 5.23E+O0 4.596+00 3.506+00 3.216+00 7.946-05 7.33F+O0 6.82E+0U 6.23F+00 5. 796+00 5.236+00 4.59E+00 3.506+00 3.21E+00 6. 316-05 7.356+00 6.85E+00 6.23E+00 5.796+00 5.236+00 4.60E+00 3.506+00 3.216+00 5.016-05 7.37E+00 6.856+00 6.246+00 5.816+00 5.236+00 4.606+00 3.50E+00 3.216+00 3.986-05 7.38E+O0 6.886+00 6.256+00 5.816+00 5.256+00 4.60E+00 3.506+00 3.21E+O0 3.16E-05 7.406+00 6.88E+00 6.256+00 5.816+00 5.256+00 4.616+00 3.506+00 3.216+00 2.51E-05 7.40E+00 6.88E+00 6.25F+00 5.826+00 5.256+00 4.61E+00 3.506+00 3.216+00 2.006-05 7.40E+00 6.88E+00 6.28E+00 5.826+00 5. 256+00 4. 616+00 3.506+00 3.216 + 0') 1.586-05 7.406+00 6.89E+00 6.286+00 5.826+00 5.256+00 4.616+00 3.506+00 3.216+00 1.26E-05 7.406+00 6.89E+00 6.28F+00 5.82E+00 5.256+00 4.616+00 3.50E+00 3.2 16 + 00 l.OOE-05 7.40E+00 6.89E+00 6.28E+00 5.82E+00 5.25E+00 4.616+00 3.506+00 3.216+00 7.946-06 7.41E+00 6.89E+00 6.28E+00 5.82E+00 5.256+00 4.616+00 3.50E+00 3.216+00 OPERATION 196760 1971 18 197284 19/292 197492 198244 196444 197830 TIMF (MINI -CORRECTED SEPTEMBER 1973 -55- TABLE 37. A SUMMARY OF THE FREQUENCIES f)F 2-MINUT6 AVFRAGE PREC I P I TA T I UN RATES FOR VARIOUS LENGTHS OF EAST-WEST LINES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 1*, 1970 THRESHOLD RATE (MM/MIN) 14-GAG6 PERCENT OF TIME THAT RATE IS GRFATER THAN THRESHOLD 12-GAG6 10-GAGF 8-GAGE 6-GAGE 4-GAG6 2-GAG6 1-GAGF 1.266+00 l.OOE+00 7.946-01 6.316-01 5.01E-01 3. 986-01 3.16E-01 2.51E-01 1.99F-01 1. 586-01 1.26F-01 l.OOE-01 7.946-02 6.316-02 5.01F-02 3.98E-02 3.166-02 2.516-02 1.996-02 1.586-02 1.266-02 1.006-02 7. 946-03 6.316-03 5.01E-03 3.986-03 3.166-03 2.516-03 2.006-03 1.586-03 1.266-03 1.00E-03 7.946-04 6.31F-04 5.016-04 3.98F-04 3.16E-04 2.51F-04 2. 006-04 1.5HF-04 1.266-04 1.006-04 7.94E-05 6.31F-05 5.01 F -OS 3.98E-05 3.161 -05 2.516-05 2.006-05 1.586-05 1.26E-05 1.00F-05 7.94F-06 0.006+00 O.OOE+OO O.OOE+00 O.OOE+OO O.OOE+00 6.09E-03 2.34E-02 5.286-02 1.106-01 2.25F-01 3.446-01 5.326-01 7.456-01 9. 836-01 1.266+00 1.566+00 1.89E+00 2.196+00 2.53E+00 2.846+00 3.166+00 3.516+00 3.866+00 4. 176 + 00 4. 45F+00 4.706+00 4.986+00 5.246+00 5.45F+00 5.67E+00 5.86E+O0 6.036+00 6.146+00 6.2HF+00 6.396+00 6.49F+00 6.586+00 6.656+00 6.71F+00 6.77E+00 6.81F+00 6.85E+00 6.85F+00 6.866+00 6.871 +00 6.H7E+00 6.87E+00 6. 8 76+00 6.876+00 6.90F+00 6.916+00 6.91F+00 6. 916+00 O.OOE+OO O.OOE+OO O.OOF+00 0.006+00 1.026-03 1.626-02 3.456-02 5.996-02 1.396-01 2.306-01 3.42E-01 5.16E-01 7.216-01 9.516-01 1.216+00 1.516+00 1.82E+00 2.106+00 2.41E+00 2.72E+00 3.026+00 3.346+00 3.646+00 3.976+00 4.236+00 4.486+00 4.71E+00 4.91E+00 5. 14E+00 5.33E+00 5.496+00 5.616+00 5.746+00 5.866+00 5.976+00 6.056+00 6.146+00 6. 14F+00 6.276+00 6.326+00 6. 356+00 6.3AF+00 6.37E+00 6. 38F+00 6. 386+00 6.39F+00 6.39E+00 6. 39F+00 6.40F+0P 6.42F+0O 6.42F+00 6.426+00 6.42F+00 0.006+00 O.OOE+OO 0.006+00 O.OOE+OO 3.056-03 1.62E-02 3.76F-02 9. 14E-02 1.61E-01 2.616-01 3.75E-01 5.37E-01 7.14F-01 9.486-01 1.21F+00 1.526+00 1 .78F + 00 2.O3F+00 2.326+00 2.606+00 2.876+00 3. 106+00 3. 376 + 00 3.636+00 3.87F+00 4.08E+00 4.286+00 4.496+00 4.666+00 4.796+00 4.936+00 5.086+00 5.216+00 5.316+00 5.416+00 5.48E+00 5.546+00 5.61E+00 5.656+00 5.69E+00 5.70E+00 5.726+00 5.73E+00 5. 74E+00 5.74F+00 5.75E+00 5.75E+00 5.76E+00 5.78E+00 5.78E+00 5.78F+00 5.78E+00 5.7SF+00 O.OOF+00 O.OOE+OO 0.006+00 O.OOE+OO 4.066-03 2.436-02 5.886-0? 1.086-01 1 .706-01 2.686-01 3.72E-01 5.39E-01 7.266-01 9.616-01 1.216+00 1.48E+00 1.716+00 2.00E+00 2.30E+00 2.546+00 2.766+00 2.996+00 3.196+00 3.416+00 3.586+00 3.796+00 3.996+00 4. 17F+00 4.296+00 4.436+00 4.546+00 4. 636+00 4.73E+00 4.806+00 4.906+00 4. 946+00 5.016+00 5.046+00 5.076+00 5.09 6+00 5. 13E+0P 5. 13E+00 5.14F+00 5. 141 +0(1 5. 14F+00 5. 14E+00 r >.l 5E + 00 5. 176 + 00 5.176+00 5. 176 + 00 5.176+00 5. 176+00 5.176+00 0.006+00 0.006+00 O.OOE+OO 4.056-03 1. 326-02 3.856-02 6.496-02 1.046-01 1.646-01 2.32E-01 3.446-01 4.886-01 6.876-01 9. 73F-01 1.186+00 1.366+00 1 .64F+00 1.95F+00 ?.?)F+00 2.496+00 2.706+00 2.886+00 3.03E+00 3.216+00 3.396+00 3.556+00 3.706+00 3.826+00 3.956+00 4.05F+00 4.146+00 4.246+00 4.326+00 4.366+00 4.406+00 4. 436+00 4. 456+00 4.49E+00 4.506+00 4.526+00 4.53F+00 4.53F+00 4.53E+00 4.53E+00 4.53E+00 4.56F+00 4.576+00 4.576+00 4.576+00 4.57E+00 4. 5 7 E +00 4.57E+00 4.57E+00 0.006+00 0.006+00 2.026-03 1.216-02 2.936-02 5.256-02 8.686-02 1.246-01 1.646-01 2. 116-01 3.196-01 4.766-01 6.996-01 9.34E-01 1. 14E+00 1.38E+00 1.66E+00 1.95E+00 2.226+00 2.456+00 2.666+00 2.826+00 3.016+00 3.206+00 3.34E+00 3.476+00 3.586+00 3.676+00 3.756+00 3.846+00 3.966+00 4.00E+00 4.07E+00 4. 12F+00 4.13E+00 4. 166+00 4.176+00 4. 18F+00 4.196+00 4.216+00 4.216+00 4.216+00 4.21E+00 4. 236+00 4.25E+00 4. 256 + 00 4.276+00 4.27F+00 4.27E+00 4.276+00 4.276+00 4.276+00 4.276+00 0.006+00 2.046-03 7.12E-03 2.65E-02 4.17E-02 6.316-02 9.57E-02 1.266-01 1.64E-01 2.22E-01 3.046-01 4.566-01 6.386-01 8.856-01 1.096+00 1.30E+00 1.53E+00 1.77E+00 1.96E+00 2.156+00 2.34E+00 2.48E+00 2.62E+00 2.74E+00 2.856+00 2.926+00 3.026+00 3.0H6+00 3. 16E+00 3.22E+00 3.28E+00 3.30E+00 3.316+00 3.32E+00 3. 446+00 3.356+00 3.356+00 3.366+00 3.376+00 3.376+00 3.37F+00 3.41E+00 3.416+00 3.41E+00 3.416+00 3.416+00 3.41E+00 3.41E+00 3.416+00 3.416+00 3.416+00 3.416+00 3.416+00 3.036-03 1.016-02 2.026-02 4.046-02 6.576-02 8.696-02 1.10E-01 1.336-01 1.746-01 2.296-01 3.56 6-01 5.136-01 7.376-01 9.20E-01 1.156+00 1.386+00 1.586+00 1.826+00 2.04E+0 2.22E+00 2.426+00 2.566+00 2.676+00 2.U0E+O0 2.876+00 2.96E+00 3.046+00 3.09 6+00 3. 126+00 3.136+00 3. 14E+00 3. 166 + 00 3. 16F+00 3.166+00 3.196+00 3. 196 + 00 3.19E+00 3. 196+00 3.216+00 3.21 E+00 3. 216 + 00 3.216+00 3.216+00 3.21E+00 3.21 E+00 3.21E+00 3.21E+00 3. 21 6+00 3. 2 IE +00 3.21E+00 3.216+00 3.216+00 3.21E+00 OPFRAT IfTM T I M I (MINI 196906 196946 197010 197146 19737? 198090 196S06 197830 -CORR6CT6D S6PTFMHFR 1973 -56- TABLE 38. FREQUENCIES OF 2-MINUTE MAXIMUM PR EC I P I TAT ION RATES FOR THE 2-GAGE (3.1-MILE) NORTH-SOUTH LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATH (MM/MIM) PERCENT OF TIME THAT RATE IS GREATFR THAN THRESHOLD ALL DATA APR MAY J UN JUL AUG 1.58F+00 1.26E+00 l.OOE+00 7.94F-01 6.31E-01 5.01 F-01 3.98E-01 3. 16F-01 2.51E-01 1.99F-01 1.58E-01 1.26E-01 1.0nE-01 7.94E-02 6. 31F-0? 5.01F-02 3.98E-02 3.16E-02 2.51E-02 1.99E-0? 1.58F-02 1.26E-02 1.00F-02 7. 94 E -0 3 6.31F-03 5.01E-03 3.98E-03 3.16F-03 2.5 IF- 3 2.00E-03 1.58E-03 1.26E-03 1.00F-03 7.94E-04 6.31F-04 5.01 E-04 3.98F-04 3.16F-04 2.51E-04 2.00F-04 1.02E-03 7.13F-03 2. 14F-02 3.26F-0? 6.21E-02 9.37E-02 1.25E-01 1.51E-01 1.92E-01 2.56E-01 3.36E-01 5.08F-01 6.97E-01 9.47F-01 1. 18F+00 1.47E+00 1.76F+00 2.02E+00 2.26F+00 2.51E+00 2.69E+00 2.85E+00 2.97E+00 3.08F+00 3. 14F+00 3.22E+00 3.28F+0O 3.34F+00 3.40E+00 3.43F+00 3.43E+00 3.45E+00 3.46E+00 3.47E+00 3.47F+00 3.49F+00 3.49F+00 3.49F+00 3.49F+00 3.SOF+00 O.OOE+OO O.OOF+00 O.OOF+OO O.OOE+OO 4.89E-03 1.95F-02 2.93E-02 5.38F-02 9.29E-02 1 .66E-01 3. 13F-01 7.14F-0] 1.21E+00 1 ,68fc+00 2. 13H + 00 2.70F+00 3. 19F + 00 3.64F+00 4.01E+00 4.' 3 7F + O0 4.76F+00 5.17F+00 5.46E+00 5.7 1 F+00 5.86E+00 6. 10E+00 6.28E+00 6.50F+00 6.67F+00 6.78F+00 6.H0F+00 6.88F+00 6. 8 8 F+00 6.88E+00 6.88E+00 6.95E+00 6.95F+00 6.95F+00 6.95E+00 6.96E+00 4.48E-03 8.96F-03 1.34F-02 3.58F-02 7. 17E-02 1.12F-01 1.57F-01 1.97E-01 2.24E-01 2.78E-01 3. 14F-01 4.12F-01 5. 15E-01 6. 9 E -01 8.60F-01 1.19F+00 1.39E+00 1.49F+00 1.64H+00 1 .73F + 00 1.78F+00 1 .84E + 00 1.90F+00 1 .95E+00 1.96E+00 2.01F+00 2.02F+00 2.03E+00 2.04F+00 2.05F+OO 2.06F+00 2. 06 F+00 2.06E+00 2.07E+00 2.07F+00 2.07F+00 2.07E+00 2.07F+00 2.07F+00 2.07F+O0 O.OOE+OO O.OOE+OO 1.39F-02 1.39E-02 3.24F-02 5.09F-02 6.48E-02 6.48F-02 1. 16E-01 1 .57E-01 2.O4E-01 2.96E-01 4.07F-01 7.40E-01 9.21E-01 1. 17E+00 1.52E+00 1.82E+00 2.09F+00 2.39F+00 2.75E+00 2.95E+00 3.00E+00 3.08E+00 3. 16F + 00 3. 17E+00 3.24F+00 3.27F+00 3.27F+00 3.27E+00 3.2 7F+00 3.28E+00 3.33F+00 3.33E+00 3.33E+00 3.34F+00 3.35F+00 3.35E+00 3.35E+00 3.35E+00 0. OOF+00 2.24F-02 6.72E-02 8.96F-02 1.48E-01 2.06E-01 2.69F-01 3.09E-01 3.67E-01 4.21F-01 4.61 F-01 5.38F-01 5.78E-01 6.36F-01 7.34F-01 8. 06 F-01 9.0SF-01 1.01E+00 1. 19E+00 1.31 F+00 1.42F+00 ] . 50F.+00 1.48 F+00 1.62F+00 1.67 F+00 1.70E+00 1 .73E+00 1.77F+00 1 .80E+00 1 .81F + 00 1.8 1 I- + 00 1.81F+00 1.8] F+00 1.82F+00 1.82E+00 1.82F+00 1 .82E+00 1 .8 2E+00 1 . 82E + 00 1 .88E+00 O.OOE+OO O.OOF+00 O.OOE+OO 8.68E-03 3.47C-02 5.21E-02 6.94F-02 8.68F-02 1. 13F-01 2.34F-01 4.25F-01 6.68F-01 9. 11F-01 1 .12F + 00 1.48E+00 1.68F+00 2.01F+00 2.53E+00 2.73F+00 2.92E+00 3. 10F + 00 3. 14F+00 3.27E+00 3.39E+O0 3.42F+00 3.46F+00 3.50F+00 3. 55F+00 3.56E+00 3.56F+00 3.56E+00 3.56E+00 3.57E+00 3.57E+00 3.57F+00 3.57F+00 3. 57E+00 3.57E+00 3.S7F+00 3.57E+00 riPFRAf ION TIME ( M I N ) 196444 409 2 4 44640 43200 44640 2 3040 -CORRECTED SEPTEMBER 1973 -63- TABLE 45. FREQUENCIES OF 2-MIMUTE MAXIMUM PK FC I P I T A T I DM KATES FOR THE 2-GAGE (3.7-MILE) EAST-WEST LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGOST 16, 1970 THRESHOLD RATE (MM/MIN) PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD ALL OATA APR MAY JON JUL AOG 1.58F+00 1.26E+00 l.OOF+On 7.94F-01 6.31E-01 5.01E-01 3. 9 8 F- 01' 3. 16F-0 1 2.51E-01 1 .996-01 1.58E-01 1.26F-01 l.OOF-01 7.94F-02 6.31F-02 5.01F-02 3.98F-02 3. 16F-02 2.51E-02 1 .99E-02 L.58E-02 1.26F-02 l.OOF-02 7.94F-03 6.31F-03 5.01 F-0 3 3.9RF-03 3.16F-03 2.51F-03 2.00E-03 1.58F-03 1.26F-03 1 .OOE-03 7.94F-04 6.31F-04 5.01 E-04 3.98F-04 3.16F-04 2. 5 IF- 04 2.00F-0^ 2.04E-03 7.12F-03 1 .83E-02 3.87F-02 6.R2F-02 1 .02F-01 1.27E-01 1.55E-01 2.09F-01 2.70E-O1 3.41F-01 4.«8F-01 27F-01 94E-01 20E+00 46F+00 69F+00 93F+00 1 7E+00 32F+00 50E+00 6RF+00 2.R3F+00 2.90E+00 3.00F+00 3.O7F+O0 3. ] 5E+00 3.22F+00 3.2HE+00 3.30F+00 3.31F+00 3.32E+00 3.34E+00 3.35F+00 3.35E+00 3.36F+00 3.37F+00 3.37F+00 3.37F+00 3.4] F+00 O.OOF+OO O.OOF+OO O.OOE+00 O.OOF+00 9.76F-03 2.44F-02 3.42F-02 4.R8F-02 9.76E-02 1.85F-01 2.88F-01 6.34F-01 1. L2F+00 1.53F+O0 1.99F+00 2.52E+00 2.89F+00 3.2 5F+00 3.76F+00 4. 16F+00 4.48F+00 5.05E+00 5.43F+00 5.61E+00 5.85E+00 6.05E+00 6.36E+00 6. 6 1 F+00 6.85F+00 6.97E+00 6.99E+00 7.06F+00 7.08F+00 7. 1 1F+00 7. 1 1E+00 7. 18F+00 7.20F+00 7.20F+00 7.20F+00 7 .2RF+00 O.OOF+OO O.OOE+00 8.96E-03 3.58E-02 6.27E-02 1 .0PE-01 1.57E-01 1 .93E-01 2.42E-01 2.96F-01 3.45E-01 4.26E-01 5.96E-01 8.02E-01 9.86F-01 1 .16E+00 1.28F+O0 I .43F+00 1.5 5E+00 1.57E+00 ] .65F + 00 1 .6RE+00 1.77E+00 1 .80F + 00 U81E + 00 1 .86F + 00 1.87F+00 1 .88F + 00 1 . 88F+00 1.88F+00 1.89F+00 1.89E+00 1.90E+00 1 .90F+00 1.90E+00 I .90F+00 1.90F+00 1 .90F+00 1.90F+00 1 .90F+00 O.OOE+OO O.OOE+00 O.OOE+00 4.63F-03 9.26F-03 24F-02 09E-0? 56E-02 06F-01 39E-01 1.67E-01 2.73E-01 4.40F-01 8. 66 E -01 1.02F+00 1 .77F+00 1.51E+00 1 .83E+00 2.07E+00 2.27E+00 2.54E+00 2.70F+00 82F+00 91E+00 06F+00 09E+00 14F+00 16F+00 16E+00 3. 16E + 00 3. 16E + 00 3. 16F+00 3.21F+00 3.21F+00 3.21E+00 3.22E+00 3.22E+00 3.22F+00 3.? 2 F+00 3.23F+00 8.96F-03 3.14E-02 6.72E-02 1.12F-01 1 .84F-01 2.28E-01 2.55F-01 3.18E-01 3.94E-01 4 . 5 7 F -0 1 5 . 2 E -0 1 5. 8 7 F-0 1 6. 6 31—01 7. 26 E -01 7.89E-01 8.7 4F-01 9.90F-01 1. 11F+00 1 .20F+00 1.27F+00 ) .31 F+00 1 .37F+00 1.42 F+00 1 .44E+00 1.49F+00 1 .53F+00 1 .54E+00 1 .5SF+00 1.56 F+00 1 .^6F+00 1.56E+00 U56E + 00 1.56E+00 1 .56E+00 1.56E+00 1 .56E +00 1 . 56E+00 1.56E+00 1 . 56E+00 1 .65F+00 O.OOE+OO O.OOF+OO 8.68E-03 3.47E-02 6.94F-02 1. 13E-01 1.30F-01 1.39E-01 1.74E-01 2.52E-01 4.08E-01 6.42E-01 9.46F-01 1. 18F+00 1.36E+00 1.65E+O0 2.03E+00 2.35F+00 2.58F+00 2.61F+00 2.83F+00 2.90F+00 2.99E+00 3.06E+00 3.06F+00 3.09F+00 3.09E+00 3. 16F+00 3. 16 F+00 3. 17 F + 00 3. 17F + 00 3. 17E+00 3. 19E + 00 3. 19F+00 3. ] 9F + 00 3. 19F+: 3. 19 F+00 3. 1 9F+00 3. 19 F+00 3. 19F+00 OPERA I ION T I M I- ( M I N 196506 409H6 4 4 6 4 4 -S200 44640 23040 -CORRECTED SEPTFMRFR 1973 -64- TABLE 46. FRFOUENCIFS OF 2-MINUTE MAXIMUM PRECIPITATION RATES FOR THE 4-GAGF (9. 4-MILE) EAST-WEST LINE OF GAGES IN CFNTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD PE 3CENT OF TIM E THAT RATE IS GREATER T HAN THRESHOL 3 RATF (MM/MIN) ALL DATA APR MAY JON JUL AUG 1.58F+00 5.05E-03 O.OOE+00 8.96E-03 O.OOF+00 1.34E-02 O.OOF+OO 1.26E+00 1.51E-02 0. OOF +00 2.24E-02 4.63E-03 4.03E-02 O.OOE+00 l.OOF+00 3.84E-02 4.70F-03 6.27E-02 9.26E-03 8.96E-02 8.68E-03 7.94F-01 7.67E-02 1 .41E-02 1 .21F-01 1.39E-02 1 .70F-01 4.34E-02 6.31E-01 1. 19F-01 4.70E-02 1.66E-01 2.31E-02 2.51E-01 8.68F-02 5.01E-01 1.72E-01 8.93F-02 2.28E-01 5.09E-02 3.2 3E-01 1.4RE-01 3.98F-01 2.32E-01 1.46F-01 3.09F-01 7.87F-02 3.81E-01 2.43F-01 3.16F-01 3.00E-01 2.30F-01 3.81F-01 1 .02F-01 4.7 OF -01 3.12E-01 2.51F-01 3.97E-01 3.48F-01 4.70F-01 1 .67F-01 4.78E-01 4.25F-01 1.99E-01 5.00F-01 5.2 IF -0 1 5.51 F-01 2.27F-0] 6.54F-01 5.73F-01 1.58F-01 6.45E-01 7.66F-01 ft.68F-01 3.01E-01 7. J .0F-0 1 8. 59F-01 1.26E-01 8.93F-01 1.34F+00 7.62E-01 4.63F-01 R.33E-01 1 .23F + 00 l.OOF-01 1. 18F+00 1.89F+00 9.8rfSF-01 7.36E-01 9 . 3 6 F - 1 1 .51F+00 7.94E-02 1.48E+00 2.41F+00 1 .21F + 00 1 . 18E + 00 1.02E+00 1.77F+O0 6.31E-02 1.76E+00 2.97E+00 1.48E+00 1.41F+00 1. lrSF + OO 1.93F+00 5.01F-02 2.07E+00 3.54F+00 1.60E+00 1 .84E+00 1 .25E+00 2.23E+00 3.98F-02 2.35E+00 3.93F+00 1.81E+00 2. 18E+00 1.44 F+00 2.57F+00 3.16F-02 2.66F+00 4.43F+00 1 .99F+00 2.56E+00 1.59E+00 2.9RE+00 2.51F-02 2.91F+00 4.92F+00 2. 16E+00 2.87F+00 1.6RE+00 3. 16F + 00 1 .99E-02 3.08F+00 5.28F+00 2.21E+00 3.05E+00 1 .ROE+00 3.26E+00 1.5BE-02 3.28F+00 5.71F+00 2.26F+00 3.26F+00 1.H9E+00 3. 49 F+00 1.26F-02 3.49E+00 6.33E+00 2.31F+00 3.47E+00 1 .^7F + 00 3.56F+00 l.OOF-02 3.64E+00 6.66E+00 2.40E+00 3.61E+00 2.00F+00 3.72E+00 7.94F-03 3.74F+00 6.89F+00 2.43F+00 3.73E+00 2.04E+00 3.7RE+00 6.31E-03 3. 8 3F+00 7.08E+00 2.45F+00 3.87E+00 2.07F+00 3.83E+00 5.01F-03 3.91E+00 7.35E+00 2.51F+00 3.88E+00 2.09E+00 3. 8 7 F + 00 3.9RF-03 3.99F+00 7.63F+00 2. 52E+00 3.94E+00 2. 11 F+00 3.88F+O0 3.16F-03 4.04F+00 7.84E+00 2.53E+00 3.44F+00 2. 12F + 00 3.88F+00 2.51F-03 4. 1 OF+00 8.05F+00 2.53E+00 3.95F+00 2. 15F+00 3.88E+00 2.00E-03 4. 13F+00 8.21F+00 2.53F+00 3.95E+00 2.15F+00 3.H8! +00 1.58F-03 4. 15F+00 8.23F+00 2.54F+00 3.98E+00 2. 16E + 00 3.88F+00 1.26F-03 4. 16F+00 8. 30 E +00 2.54F+00 3.99E+00 2. 16E + 00 3.88E+00 l.OOE-03 4. 19^+00 8.33F+00 2.54E+00 4.07F+00 2. 18F+00 3.8BF+00 7.94E-04 4.20E+00 8.34F+00 2.54F+00 4.07E+00 2. 18E+00 3.89F+O0 6.31E-04 4.20E+00 8.34E+00 2.54E+0O 4.07F+00 2. 1BE+00 3.89F+00 5.01 F-04 4.21F+00 8.39E+00 2.S4F+00 4.07F+00 2. 1RF+00 3.89E+00 3.98F-04 4.21 F+00 R.40E+00 2. 5 5E+00 4.0RE+00 2. 1 8F+00 3.89F+00 3. 1 6F-04 A. 2 ) F+00 B.40F+00 2.55F+00 4 .08F+00 2. 18E + 00 3.89F+00 2.51E-04 4.21 F+no 8.40F+00 2. 55F+00 4.0RF+00 2. 1 RE+OO 3.89F+00 2 .00F-04 4.27F+00 R . 56F+00 2.55F+00 4 .OQF+00 2.27F+00 3.89F+O0 UPFRAT ION 198090 42 5 70 44640 432 00 ■'.4 6 40 2 3040 T I M F ( Ml M ) -CORRECTED SEPTEMBER 1973 -65- TABLF 47. FREQUENCIES OF 2-MINUTE MAXIMUM PR EC I P I T A T I ON RATFS FOR THF 6-GAGE (14.9-MILE) EAST-WEST LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD PFRCENT OF TIME THAT RATE IS GRFATFR THAN THRESHOLD RATE (MM/MIN) ALL DATA APR MAY JUM JUL AUG 1.58F+00 1.01E-02 1.43F-02 8.96E-03 O.OOF+OO 2.24E-02 O.OOF+OO 1.26E+00 2.63F-02 2.39E-02 3. 14E-02 4.63E-03 5.82F-02 O.OOF+OO l.OOF+OO 6.59E-02 6.21E-02 9.41F-02 1.85E-02 1. 16F-01 8. 68F-03 7.94F-01 1.28E-01 1.00F-01 1.84E-01 2.78E-07 2.37F-01 4.34F-02 6.31F-01 1.94E-01 1.48F-01 2.64F-01 4. 17F-02 3.58E-01 1.04F-01 5.01E-01 2.60E-01 2.01F-01 3.23F-01 7.87E-02 4.66E-01 1.91E-01 3.9PF-01 3.34F-01 2.44E-01 4.30E-01 1. 16E-01 5.42E-01 3.21F-0 1 3.16F-01 4.2HF-01 3.44F-01 5.15F-0 1 1.48E-0] 6.72F-01 4.60E-01 2.51F-01 5.46F-01 4.83F-01 6.41F-01 2. 1RF-01 7.89F-01 6.2 5E-01 1 .99F-01 6.77F-01 6.74F-01 7. 66 E -0 1 3.0 1E-0 1 8.96F-01 7.90E-01 1.58F-01 8.70E-01 9.80F-01 9. 18 F- 1 4.35E-01 9.9 5F-01 1. 15E+00 1.76F-01 1. 13F + 00 1.47E+00 1 .08E + 00 6.39E-01 1 .10F+00 1.57F+00 l.OOF-01 1.44E+00 1.99E+00 1.3RE+00 9. 72E-01 1.2 3 F+00 1 .«7F + 00 7.94F-02 1.76F+00 2 .45F+00 1 .64F + 00 1.49F+00 1.32E+00 2. 1 1F + 00 6.31^-02 2.08F+00 3.05F+00 1.97F+00 1.85E+00 1.43F+00 2.25E+00 5.01F-02 2.40E+00 3.45E+00 2.18E+00 2.36F+00 1.56E+00 2.60F+00 3.98E-02 2.6HF+00 3.87E+00 2.34F+00 2.65F+00 1.73E+00 3. 10F+00 3.16E-02 2.99F+00 4.32F+00 2.54F+00 3.O7F+00 1 .89F+00 3.47E+O0 2.51F-02 3.24E+00 4.70F+00 2.73F+00 3.43E+00 2.00F+00 3.65F+00 1.99F-02 3.43F+00 5.0 7 F+00 2.79F+00 3.62F+00 7.14E+0O 3.86F+00 1.58F-0? 3.64F+00 5.46F+00 2.90E+00 3.R8E+00 2.26E+00 4.U2F+00 1.26F-02 3.88E+00 6.13F+00 2.97E+00 4.08F+00 2.37F+00 4.09F+00 l.OOF-02 4.03F+00 6.55F+00 3.04E+00 4. 17F+00 2.45F+00 4.21F+00 7.94F-03 4. 1 1F + 00 6.71F+00 3.06F+00 4.26E+00 2.50F+00 4.2 5E+00 6.31F-03 4. 19F+00 6.94E+00 3.O7F+O0 4.35F+00 2.53F+00 4.31F+00 5.01 F-03 4. ?6F +00 7. 16F+00 3. 1 1F+00 4.36F+00 2.55F+00 4.35E+00 3.98F-03 4.33F+00 7.41F+00 3. 12F+00 4. 4 1 F+00 2. 57 F+00 4.36E+00 3. 16F-03 4.3HF+00 7.57F+00 3.14F+00 4.43E+00 2.59F+00 4.36F+00 2.51F-03 4.42E+00 7.73F+00 3. 15F+00 4.44F+00 2.61F+00 4 . i 6 F + 2.00F-03 4.45E+00 7.H4F+00 3. 15F + 00 4 . 4 4 F + 2.67F+O0 4.37E+00 1.58F-03 4.46F+00 7.86F+00 3. 16E+00 4.45F+00 2.62E+00 4. 37 F+00 1.26F-03 4.47F+00 7.93F+00 3. 16F+00 4.45F+00 2.63F+00 4. 37F+00 1.00F-03 4.53F+00 8.08F+00 3. 17F+00 4.53F+00 2. 64 F+00 4. 37F+00 7.O4F-04 4.53F+00 8.0RF+00 3. 17F + 00 4.53F+00 2.64F+00 4.3 7F+00 6.31F-04 4. 53F+00 8.08F+00 3. 17E+00 4.53E+00 7.64F+00 4.37F+00 5.01F-04 4.53F+O0 8.08F+00 3. 17F+00 4.64E+00 2.64F+00 4.37F+00 3.9PF-04 4 . 5 4 E + K.08F+00 3. 1 7F+00 4.5 5F+00 2.65E+00 4.38F+0H 3. 16F-04 4.54F+00 8.08F+00 3. 17E+00 4.66F+00 2.65F+00 4.38F+00 2.51F-04 4. 54F+00 H.08F+00 3. 17F+00 4. 5 5F+00 2. 65 F+00 4. 38F+00 2.00F-04 4.57F+00 8. 13F + 00 3. IP F+00 4 . 5 6 E + 2.73F+00 4.3 8F+00 OPFRA I I IN 197372 41H52 44640 43200 44640 2 3 040 1 I M F ( M I N ) -CORRFCTFI) SEPTEMBER 1973 -67- TABLE 49. FREQUENCIES OF 2-MINUTF MAXIMUM PRECIPITATION RATES FOR THE 10-GAGE (?6. 9-MILE) EAST-WEST LINE OF GAGES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLD RATE ( MM/MI N) ALL OATA APR MAY JUN JUL AUG 2.51F+00 1.02E-03 4.82E-03 O.OOF+OO O.OOE+OO O.OOF+OO O.OOE+OO 1.99F+00 4.06F-03 4. 82 F-0 3 4.48F-03 O.OOE+00 8.9 6E-03 O.OOE+00 L58F + 00 2.54E-02 2.41F-02 2.24E-02 1.85E-02 4.936-02 O.OOE+OO 1 .26F- + 00 6. 19E-02 6.27F-02 7.17E-02 3.70E-02 1.08E-01 O.OOF+OO 1 .006+00 1.25E-01 1.01E-01 1.79E-01 1.06E-01 1.70E-01 8.68F-03 7.94E-01 2.09E-01 1.59E-01 2.91E-01 1.67E-01 2.96F-01 5.21F-02 6.31F-01 3. 10E-01 2.55F-01 3.94F-01 2. 18F-01 4.35E-01 1. 746-01 5.01F-01 4.12F-01 3. 47 F -0 1 4.70F-0 1 3.29E-01 5.56E-01 2. 9 56-01 3. 9 HI— 01 5.34F-01 4.24F-01. 6 . 2 7 F - 1 4. 1 2F-01 6.546-01 5.47F-01 3.16E-01 6. 65 F -01 5. 9 8 F -0 1 7.48E-01 4.58F-01 7.89F-01 7.73F-01 2.51F-01 8.37E-01 8.34F-01 9. 32F-01 5.56E-01 9. 146-01 1.03E+00 1.99F-0 1 1.05E+00 1.20F+00 1.14F+00 7.08F-01 1 .036 + 00 1 .28 6+00 1.58F-01 1.326+00 1.66F+00 1.36F+00 9 . 2 1 F - 1 1. 15F+00 1 . 706 + 00 1 .26F-01 1 .64F+00 2.20F+00 1.58E+00 1 .23F+00 1.286+00 2 . 2 F + l.OOF-01 1 .9HE+00 2.69F+00 1.92E+00 1.67E+00 1.436+00 2.476+00 7.<44F-0? 2.36F+00 3.2 ft: +00 2.22E+00 2.25F+00 1.556+00 2.73F+O0 6.31F-02 2.71F+00 3.79F+00 2.606+00 2. 6 2 F+OO 1.706+00 3.09F+00 5.01 F-02 3. 10F+00 4.22F+00 2.88E+00 3.24E+00 1. 89F+00 3.60F+00 3.9«F-02 3.46E+00 4.6 5F+00 3. 13F+00 3.66E+00 2. 1 1F+00 4. 196 + 00 3. 16F-0? 3.82F+00 5. 10F+00 3.386+00 4. 1 OF+00 2.31 F+OO 4.74E+00 2.51F-02 4. 15F+00 5.64F+00 3.62F+00 4.48F+00 2.45F+00 5. 15F+00 1.99F-0? 4.41F+00 6. 14E+00 3.71 E+00 4.68F+00 2.706+00 5.48F+00 1.58F-02 4.66F+00 6.64F+00 3.8 56+00 4.91E+00 2.856+00 5.74F+00 1 .261-0? 4.89F+00 7.33F+00 3.956+00 5.04F+00 2.946+00 5. 816+00 1 .001-0? 5.06F+00 7.H6F+00 4.00F+00 5. 10E + 00 3.06F+00 6.9 1F + 00 7.94F-03 5. 1 RF+OO 8.04F+00 4.05F+0O 5.2 5F+00 3.14F+00 6. 02 F+OO 6. 31 F-03 5.28F+00 8.22E+00 4. 11E+00 5.38F+00 3. 1 9E+00 6. 12 F+OO 5.01 F-03 5.37F+O0 8. 48 F +00 4. 16E+00 5.44F+00 3.21F+00 6.20E+00 3. 9 P F-0 3 5.47E+00 8.72F+00 4. 17F+00 5.51E+00 3.2 56+00 6.32E+00 3. 16F-03 5.53F+00 H.88F+00 4.24F+00 5. 5 2 F+OO 3.3OF+O0 6.3 5F+00 2.511-03 6.58F+00 9.01F+00 4.27E+00 5.56F+00 3. 3 1 F+OO 6. 35F+00 2.00F-03 5.66F+00 9.33F+00 4.2RF+00 5.59F+00 3. 33F+O0 6. 3 7 F + OO 1.68F-03 6.67F+00 9.34F+00 4.296+00 5.61E+00 3. 33E+00 6.37F+00 1 .26F-03 5.69F+00 9.42F+00 4.29F+00 5.62E+00 3. 33E+00 6.38F + (>0 1 .001-03 5.73E+00 9.47F+00 4. 30F+00 5.69F+00 3. 35 E+00 6.44E+00 7.94F-04 6.74F+00 9. 48 F +00 4.30F+00 5.71F+00 3. 36F+00 6.45F+00 6.31F-04 5. 74F+00 9.486+00 4. 306+00 5.71F+00 3. 36 6+00 6.46F+00 5.0 1 F-04 5.741 +00 9.4HF+00 4.31F+00 5. 7 2 F+OO 3.36F+00 6.48E+00 3.98F-04 5.75F+00 9. 486+00 4. 31 F+OO 5. 73 F+OO 3. 366+00 6.48 6+00 3. 16F-04 5.75F+00 9. 48 F +00 4.31F+00 5.7 3F+00 5. ',h F + oo 6. 48 F+OO 2. 51 F-04 5. 75F+00 9. 48 F+OO 4. 3 1 F+OO 6. 7 3F+00 3. 166+00 6.48E+00 2.00F-04 5.7RF+00 9.53F+00 4. 3 I F + OO 5.73E+00 3.456+00 6.4HF+00 OPFRA i ION 1970 10 4] 4 90 44640 43 200 44640 ? 3 04 TIME ( M I M ) ■CORRECTED SFkIFMKER 1973 TABLE 52. A SUMMARY OF THE FREQUENCIES OF 2-MINUTE MAXIMUM PRECIPITATION RATES FOR VARIOUS LENGTHS OF NORTH-SOUTH LINES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATF ( MM/MI N ) 3. 16E+00 2.51F+0O 1 .99F+00 1.58E+O0 1.26F+00 l.OOE+00 7.94F-01 6.31E-01 5.01F-01 3.9RE-01 3. 16F-01 2.51E-01 1.99F-01 1.5RE-01 1 .26F-01 l.OOF-01 7.94F-02 6.31F-02 5.01E-02 3.9RF-0? 3.16F-02 2.51 I -0 2 1.99F-02 1 .58F-02 1.26F-02 1 .001 -02 7.94E-03 6.31 E-03 5.01F-03 3.98F-03 3. 16F-03 2.51E-03 2.00F-03 1 .5RF-03 1.26E-03 1.00F-03 7.94F-04 6.31E-04 5.01F-04 3.9RF-04 3. 16F-04 2.5 1 F-04 2. 00 F-04 OPFR ATION f I M F (MINI PERCENT OF TIME THAT RATE IS GREATER THAN THRESHOLII 14-GAGE 12-GAGF 10-GAGE 8-GAGE 6-GAGE 4-GAGE 2-GAGE 1-GAGE 3.05E-03 3.04F-03 3.04E-03 1.01F-03 O.OOE+00 O.OOE+OO O.OOE+OO O.OOE+OO R.13E-03 7.10F-03 7.10E-03 4.05E-03 1.01E-03 O.OOE+00 O.OOF+00 O.OOF+00 2.54F-02 1.93E-02 1.82E-02 1.32E-02 6.0HF-03 2.02E-03 O.OOE+OO O.OOE+00 5.79F-02 4.57E-02 4.06E-02 2.R4E-02 1.R2E-02 R.07E-03 1.02E-03 O.OOE+OO 1.20E-01 9.R4F-02 R.82E-02 6.79F-02 3.95F-0? 2.02E-02 7. 13E-03 3.03E-03 2.09E-01 1 .69F-01 1.48E-01 1.23E-01 7.H0E-02 4.64E-02 2.14E-02 1.01E-02 3.35E-01 2.65F-01 2.29E-01 1.93E-01 1. 34E-01 7.87E-02 3.26E-02 2.02E-02 4.71E-01 3.R3F-01 3.32E-01 2.71E-01 1.92E-01 1.24E-01 6.21E-02 4.04E-02 6. 12E-01 5.07F-01 4.39F-01 3.71E-01 2.60E-01 1.79E-01 9.37E-02 6.57E-02 7.56E-01 6.34F-01 5.49F-01 4.65E-01 3.34E-01 2.24E-01 1.25E-01 8.69E-02 9.46E-01 7.R5F-01 6.90E-01 5.H6E-01 4. 14F-01 2.80E-01 1.51E-01 1. 10E-01 1.14F+00 9.63E-01 8.46E-01 7. 12E-01 5. 15F-01 3.47E-01 1.92E-01 1.33E-01 1.42E+00 1.22F+00 1.07E+00 R.97F-01 6.64E-01 4.46E-01 2.56E-01 1.74E-01 1.75E+00 1 .54E+00 1.36F+00 1 . 14E+00 H.65F-01 5.91E-01 3.36E-01 2.29E-01 2.18E+00 1.92E+00 1.71E+00 1.45E+00 1. 1 3 F+00 R. 1RF-01 5iORF-01 3.56E-01 2.66F+00 2.38F+00 2.14E+00 1 .R4E+00 1.47F+00 1.09E+00 6.97E-01 5. 13E-01 3. 13F+00 2.R1E+00 2.53E+00 2.21E+00 1.7HE+00 1.3RE+00 9.47E-01 7.37E-01 3.62E+00 3.31F+00 3.02F+00 2.64F+00 2.1RE+00 1 .7^F+00 1 . 1RE+00 9.20E-01 4.04E+00 3.74F+00 3.42E+00 3.0 3E+00 ?. 57E+00 2.04E+00 1.47E+00 1.15E+00 4.53E+00 4. 16F+00 3.R0E+00 3.41E+00 2.42E+00 2.37E+00 1.76F+00 1.38E+00 4.94F+00 4.54E+00 4. 15F+00 3.73E+00 3.24F+00 2.66F+00 2.02E+00 1.58E+00 5.33E+00 4.R7E+00 4.44E+00 4.06E+00 3.54E+00 2.96E+00 2.26E+00 1.H2E+00 5.65F+00 5. 19E + 00 4.75F+00 4.35F+00 3. 8 1 F+00 3.25E+00 2.51E+00 2.04E+00 5.9RE+00 5.49E+00 5.02E+00 4.62F+00 4.03F+00 3.47E+00 2.69F+00 2.22E+00 6.27F+00 5.74F+00 5.24F+00 4. 79E+00 4.25E+00 3.69E+00 2.R5F+00 2.42E+00 6.51E+00 5.95F+00 5.42E+00 4.97E+00 4.43E+00 3.85E+00 2.97F+00 2.56E+00 6.66E+00 6. 12F+00 5.56F+00 5. 1 1E+00 4.56F+00 3.98E+00 3.0RE+00 2.67E+00 6.78E+00 6.23E+00 5.67F+00 5.21F+00 4.66E+00 4.04E+00 3. 14E+00 2.80E+00 6.90E+00 6.35F+00 5.77F+00 5.31E+00 4.75E+00 4. 16F + 00 3.22E+00 2.87E+00 7.01F+00 6.48F+00 5.89E+00 5.42E+00 4.R5E+00 4.24E+00 3.2RE+00 2.96E+00 7.09E+00 6.59F+00 6.01E+00 5.53E+00 4.94F+00 4.33E+00 3. 35E+00 3.04E+00 7.20F+00 6.69F+00 6. 13F+00 5.64E+00 5.06F+00 4.46E+00 3.40E+00 3.09E+00 7.26E+00 6.76F+00 6. 16F+00 5.71F+00 5. 15E+00 4.52E+00 3.43E+00 3.12E+00 7.29F+O0 6.7RF+00 6.1RE+00 5.72F+O0 5.16F+00 4.52E+00 3.43E+00 3. 13F + 00 7.31E+00 6.R0F+00 6.20F+00 5.74E+00 5. 1RF+00 4.55F+00 3.45E+00 3. 14E+00 7.37E+0O 6.H6F+00 6.23F+00 5.77E+00 5.21E+00 4.57E+00 3.46E+00 3. 16E+00 7.3RF+00 6.R6E+00 6.24F+00 5. 7RF+00 5.22F+00 4.58E+00 3.47E+00 3. 16E+00 7.3RE+00 6.R6F+00 6.24F+00 5.78F+00 5.22F+O0 4.58E+00 3.47E+00 3. 16E+00 7.3RE+00 6.R6F+00 6.24F+00 5. 79E+00 5.23F+00 4.59E+00 3.49E+00 3. 19E + 00 7.40F+00 6.R9F+00 6.28F+00 5.8 I F+00 5.25E+00 4.60E+00 3.49E+00 3. 19E+00 7.40E+00 6.R9F+00 6.28F+00 5.R1F+00 5.25E+00 4.60E+00 3.49E+00 3. 19E + 00 7.40E+00 6.R9E+00 6.28F+00 5.81E+00 5.25E+00 4.60F+00 3.49E+00 3. 19E+00 7.41 F+00 6.R9F+00 6.2RE+00 5. R2F+00 5.25F+00 4.61E+00 3.50E+00 3.21E+00 196760 1 9 7 1 1 R 1972R4 197792 147492 198244 196444 197830 -CORRECTED SEPTEMBER 1973 ■71- TABLF 53. A SUMMARY OF THE FREQUENCIES OF 2-MINUTE MAXIMUM PRECIPITAIION RATES FOR VARIOUS LENGTHS OF EAST-WEST LINES IN CENTRAL ILLINOIS, FROM APRIL 1 THROUGH AUGUST 16, 1970 THRESHOLD RATE (MM/MIN) 14-GAGE PERCENT OF TIME THAT RATE IS GRFATER THAN THRESHOLD 12-GAGF 10-GAGF H-GAGE 6-GAGF 4-GAGF 2-GAGE 1-GAGE 2.51F+00 1.99F+00 1.58F+00 1.26E+00 l.ooF+nn 7.94F-01 6.31F-0 1 5.01F-01 3.98F-01 3. 16F-01 2.51F-01 1.99E-0] 1.58F-01 1.26E-01 l.OOE-01 7.94F-0? 6.31F-0? 5.O1F-02 3.9SF-02 3. 16E-02 2.51F-02 1.99I--02 1.58E-02 1.26E-02 l.OOF-n? 7.94F-03 6.31F-03 5.01E-03 3.98F-03 3. 16E-03 2.51 F-D3 ?.ooe-o3 1 .5BF-03 i.2*sr-03 1 .OOF-03 7.94E-04 6.31 E-04 5.01E-O4 3.9RF-04 3.16E-04 2.51F-04 2.00F-04 4.06E-03 9. 14E-03 4.37E-02 1.04F-01 1.92E-01 3.15E-01 4.63F-01 6.26E-01 7.85F-ni 9.65F-01 1. 1 7E+00 l.ME + OO 1.73E+00 2. 10F+00 2.49F+00 2.94E+00 3.42E+00 3.R9E+00 4.31E+00 4.76F+00 5.14F+00 5.44E+00 5.72F+00 5.96E+00 6.15F+00 6.29F+00 6.39F+00 6.5nE+on 6.60E+00 6.67E+00 6.73E+00 6.81E+00 6.82F+00 6.R4E+00 6.87E+00 6.87E+00 6.87F+00 6.87F+00 6.8HE+00 6.88F+00 6.88F+00 6.9i f+ on 1.02F-03 5.0RF-03 2.9AF-02 7.51F-02 1.48F-01 2.50F-O1 3.72F-01 5.09F-01 6.61 F-01 8.25F-01 l.OlE+00 1.23F+00 1.53F+00 1.87F+00 2.25F+00 2.66F+00 3.08F+00 3.54E+00 3.91E+00 4.32E+00 4.68F+00 4.98E+00 5.25E+00 5.48F+00 5.6RF+00 5.81F+00 5.92F+00 6.00F+00 6. 1 1F+00 6. 18E+00 6.23F+00 6. 31E+00 6.32F+00 6.35E+00 6.38F+00 6.38F+00 6.38E+00 6.38F+00 6.39F+00 6.39F+00 6.39F+00 6.42E+00 1.02E-03 4.06F-03 2.54E-02 6. 19F-02 1.25E-01 2.09E-01 3.10F-01 4. 12E-01 5.34F-01 6.65F-01 8.37E-01 1.05F+00 1.32E+00 1.64F+00 1 .98E+00 2.36E+00 2.71E+00 3. 10E+00 3.46E+00 3.82E+00 4.15E+00 4.41F+00 4.66E+00 4.89E+00 5.06E+00 5. 18F+00 5.2RE+00 5.37E+00 5.47F+00 5.53E+00 5.58E+00 5.66E+00 5.67E+00 5.69E+00 5.73F+00 5.74E+00 5.74F+00 4.74F+00 5.75F+O0 5. 7SF+00 5.75F+00 5. 7RF+00 O.OOF+OO 1.01F-03 1.42E-02 4.77F-02 1 .01F-01 1.77F-01 2.62E-01 3.48F-01 4.49E-01 5.55E-01 7.01F-01 8.72E-01 1. 12E+00 1.40E+00 1 .72E+00 2.08E+00 2.41E+00 2.74F+00 3.04E+00 3.37E+00 3.65E+00 3.89E+00 4.1 1E + 00 4.36E+00 4.53E+00 4.61E+00 4.69P +00 4. /9E+00 4.87F+00 4.92F.+00 4.97E+00 5.04E+00 5.05E+00 5.O7F+00 5. 13E+00 5. 13F + 00 5. 13F+00 5. 14F+00 5.14F+00 5. 14F+00 5. 14F+00 5. 17F+00 O.OOF+OO O.OOF+OO 1 .01E-02 2.63F-02 6.59F-02 1.28E-01 1.94E-01 2.60E-01 3.34E-01 4.28F-01 5.46E-01 6.77F-01 R.70E-01 1. 13E+00 1.44F+00 1.76E+00 2.08F+00 2.40F+00 2.68E+00 2.99E+00 3.24E+00 3.4 3E+00 3.64E+00 3.88F+00 4.03F+00 4. 1 1 F+00 4. 19F + 00 4.26F+00 4.33F+00 4.38E+00 4.42E+00 4.45E+00 4.46F+00 4.^7F+00 4.53E+00 4. 5 fF + OO 4.53F+0O 4.53F+00 4.54F+00 4.54E+00 4.H4E+00 4.57F+00 O.OOE+OO O.OOF+OO 5.05E-03 1.51F-02 3.84E-02 7.67E-02 1.19E-01 1.72F-01 2.32E-01 3.00F-01 3.97E-01 5.00F-01 6.45E-01 8.93F-01 1.18E+00 1.48E+00 1.76E+00 2.07F+00 2.35E+00 2.66E+00 2.91E+00 3.08F+00 3.28E+00 3.49E+00 3.64E+00 3.74E+00 3.83E+00 3.91E+00 3.99E+00 4.04E+00 4.10E+00 4. 13F+00 4. 15F + 00 4. 16F+00 4. 19E+00 4.20E+00 4.20F+00 4.21F+00 4.21E+00 4.21F+00 4.21F+00 4.27E+00 O.OOE+OO O.OOE+OO 2.04E-03 7. 12E-03 1.83E-02 3.87E-02 6.82E-02 1.02F-01 1.27E-01 1.55E-01 2.09E-01 2.70F-01 3.41F-01 4.98E-01 7.27E-01 9.94E-01 1.20F+00 1.46E+00 1.69E+00 1.93F+00 2.17E+00 2.32E+00 2.50E+00 2.68F+00 2.83E+00 2.90E+00 3.00E+00 3.07E+00 3.15E+00 3.22E+00 3.28E+00 3.30E+00 3.31E+00 3.32E+00 3.34F+00 3.35E+0O 3. 4SF+00 3.36E+00 3.37E+00 3.37E+00 3.37F+00 3.41E+00 O.OOE+OO O.OOE+OO O.OOE+OO 3.03E-03 1.01E-02 2.02F-02 4.04E-02 6.57F-02 8.69E-02 1.10E-01 1.33E-01 1.74F-01 2.29F-01 3.56E-01 5.13E-01 7.37E-01 9.20E-01 1. 15E+00 1.38E+00 1.58F+00 1.82E+00 2.04E+00 2.22E+00 2.42E+00 2.56E+00 2.67E+00 2.80E+00 2.87E+00 2.96E+00 3.04E+00 3.09E+00 3. 12E+00 3.13E+00 3. 14E+00 3.16F+00 3.16E+00 3. 16E+00 3. 19E+00 3.19E+00 3. 19E+00 3.19E+00 3.21F+00 0PFRA1 ION T I M F (MINI 196906 196946 197010 197146 197372 198090 196S06 197830 -CORRECTED SFPIFMHFR 1973 UNIVERSITY OF ILLINOIS-UBBANA 3 0112 104637225