Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05439500 SOUTH BRANCH KISHWAUKEE RIVER NR FAIRDALE, IL
| Water year | Segment | Discharge code | Cumulative reservoir storage (acre-feet) | Urban fraction | Precipitation (inches) | Observed peak discharge (ft3/s) | Adjusted peak discharge (ft3/s) | Exceedance probability |
| 1940 | 1 | -- | 1127 | 0.025 | 0.003 | 1350 | 1520 | 0.926 |
| 1941 | 1 | -- | 1127 | 0.025 | 0.043 | 2380 | 2610 | 0.780 |
| 1942 | 1 | -- | 1127 | 0.025 | 0.693 | 4530 | 4880 | 0.392 |
| 1943 | 1 | -- | 1127 | 0.026 | 0.709 | 5680 | 6070 | 0.252 |
| 1944 | 1 | -- | 1127 | 0.026 | 1.172 | 5850 | 6240 | 0.235 |
| 1945 | 1 | -- | 1127 | 0.026 | 1.518 | 2510 | 2740 | 0.760 |
| 1946 | 1 | -- | 1127 | 0.027 | 0.569 | 6840 | 7280 | 0.160 |
| 1947 | 1 | -- | 1127 | 0.027 | 0.680 | 2210 | 2420 | 0.809 |
| 1948 | 1 | -- | 1127 | 0.027 | 1.757 | 5680 | 6060 | 0.253 |
| 1949 | 1 | 2 | 1127 | 0.028 | 0.299 | 6000 | 6390 | 0.221 |
| 1950 | 1 | -- | 1127 | 0.028 | 1.446 | 4530 | 4860 | 0.394 |
| 1951 | 1 | -- | 1127 | 0.029 | 2.425 | 6670 | 7080 | 0.171 |
| 1952 | 1 | -- | 1127 | 0.030 | 0.486 | 4690 | 5020 | 0.374 |
| 1953 | 1 | E | 1127 | 0.031 | 0.735 | 1290 | 1440 | 0.932 |
| 1954 | 1 | E | 1127 | 0.032 | 1.092 | 2340 | 2540 | 0.790 |
| 1955 | 1 | -- | 1127 | 0.033 | 3.470 | 5910 | 6270 | 0.233 |
| 1956 | 1 | E | 1127 | 0.034 | 0.709 | 1740 | 1910 | 0.882 |
| 1957 | 1 | E | 1127 | 0.034 | 0.566 | 2000 | 2180 | 0.844 |
| 1958 | 1 | -- | 1127 | 0.035 | 1.830 | 4290 | 4570 | 0.438 |
| 1959 | 1 | 2 | 1127 | 0.036 | 0.459 | 2900 | 3110 | 0.696 |
| 1960 | 1 | -- | 1127 | 0.037 | 0.576 | 5240 | 5550 | 0.309 |
| 1961 | 1 | E | 1127 | 0.038 | 1.287 | 1010 | 1120 | 0.956 |
| 1962 | 1 | -- | 1127 | 0.039 | 0.319 | 4760 | 5040 | 0.371 |
| 1963 | 1 | E | 1127 | 0.040 | 0.872 | 1510 | 1650 | 0.911 |
| 1964 | 1 | E | 1127 | 0.041 | 0.734 | 1090 | 1200 | 0.951 |
| 1965 | 1 | 2 | 1127 | 0.042 | 0.112 | 4000 | 4240 | 0.492 |
| 1966 | 1 | -- | 1127 | 0.043 | 0.519 | 5060 | 5330 | 0.335 |
| 1967 | 1 | -- | 1127 | 0.044 | 0.998 | 2850 | 3030 | 0.710 |
| 1968 | 1 | E | 1127 | 0.045 | 1.512 | 4460 | 4700 | 0.417 |
| 1969 | 1 | -- | 1127 | 0.046 | 0.126 | 5030 | 5290 | 0.340 |
| 1970 | 1 | -- | 1127 | 0.047 | 1.929 | 3910 | 4120 | 0.513 |
| 1971 | 1 | -- | 1127 | 0.047 | 0.492 | 3930 | 4140 | 0.510 |
| 1972 | 1 | -- | 1127 | 0.048 | 1.647 | 6020 | 6290 | 0.231 |
| 1973 | 1 | -- | 1127 | 0.049 | 1.696 | 8460 | 8800 | 0.088 |
| 1974 | 1 | -- | 1127 | 0.050 | 1.368 | 6780 | 7060 | 0.173 |
| 1975 | 1 | -- | 1127 | 0.051 | 0.025 | 3740 | 3930 | 0.551 |
| 1976 | 1 | -- | 1127 | 0.052 | 1.130 | 6690 | 6950 | 0.179 |
| 1977 | 1 | -- | 1127 | 0.053 | 1.423 | 799 | 866 | 0.974 |
| 1978 | 1 | -- | 1127 | 0.054 | 1.180 | 5470 | 5690 | 0.293 |
| 1979 | 1 | -- | 1127 | 0.055 | 0.343 | 7600 | 7880 | 0.128 |
| 1980 | 1 | -- | 1127 | 0.056 | 0.454 | 3390 | 3550 | 0.622 |
| 1981 | 1 | -- | 1127 | 0.056 | 2.078 | 2840 | 2980 | 0.720 |
| 1982 | 1 | -- | 1127 | 0.057 | 0.270 | 3460 | 3610 | 0.611 |
| 1983 | 1 | -- | 1127 | 0.057 | 1.730 | 7220 | 7470 | 0.149 |
| 1984 | 1 | -- | 1127 | 0.057 | 0.670 | 4400 | 4580 | 0.437 |
| 1985 | 1 | -- | 1127 | 0.058 | 1.309 | 5200 | 5400 | 0.327 |
| 1986 | 1 | -- | 1127 | 0.058 | 1.134 | 3120 | 3260 | 0.671 |
| 1987 | 1 | -- | 1127 | 0.059 | 2.950 | 5300 | 5490 | 0.316 |
| 1988 | 1 | -- | 1127 | 0.059 | 0.260 | 3680 | 3830 | 0.571 |
| 1989 | 1 | -- | 1127 | 0.060 | 1.423 | 5370 | 5560 | 0.308 |
| 1990 | 1 | -- | 1127 | 0.060 | 0.550 | 2880 | 3010 | 0.715 |
| 1991 | 1 | -- | 1127 | 0.061 | 0.740 | 3070 | 3200 | 0.682 |
| 1992 | 1 | E | 1127 | 0.062 | 0.631 | 1250 | 1320 | 0.941 |
| 1993 | 1 | -- | 1127 | 0.063 | 1.698 | 8190 | 8420 | 0.100 |
| 1994 | 1 | -- | 1127 | 0.065 | 0.839 | 8790 | 9020 | 0.082 |
| 1995 | 1 | -- | 1127 | 0.066 | 0.898 | 2610 | 2710 | 0.765 |
| 1996 | 1 | -- | 1127 | 0.067 | 4.011 | 25400 | 25900 | 0.003 |
| 1997 | 1 | -- | 1127 | 0.068 | 2.175 | 9940 | 10200 | 0.059 |
| 1998 | 1 | -- | 1127 | 0.069 | 0.794 | 3160 | 3260 | 0.671 |
| 1999 | 1 | -- | 1127 | 0.070 | 1.101 | 12200 | 12400 | 0.032 |
| 2000 | 1 | -- | 1127 | 0.071 | 0.874 | 2650 | 2730 | 0.762 |
| 2001 | 1 | -- | 1127 | 0.074 | 0.707 | 3900 | 3990 | 0.539 |
| 2002 | 1 | -- | 1127 | 0.076 | 2.261 | 11000 | 11200 | 0.045 |
| 2003 | 1 | E | 1127 | 0.078 | 0.712 | 1820 | 1860 | 0.887 |
| 2004 | 1 | -- | 1127 | 0.080 | 1.384 | 5110 | 5180 | 0.353 |
| 2005 | 1 | -- | 1127 | 0.083 | 0.607 | 1700 | 1730 | 0.902 |
| 2006 | 1 | E | 1127 | 0.085 | 1.176 | 882 | 898 | 0.971 |
| 2007 | 1 | -- | 1127 | 0.087 | 2.542 | 7980 | 8030 | 0.120 |
| 2008 | 1 | -- | 1127 | 0.089 | 0.294 | 4850 | 4870 | 0.393 |
| 2009 | 1 | -- | 1127 | 0.092 | 0.832 | 5010 | 5020 | 0.373 |