Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05447500 GREEN RIVER NEAR GENESEO, 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 | -- | 1394 | 0.008 | 0.531 | 3750 | 3780 | 0.753 |
| 1941 | 1 | -- | 1394 | 0.008 | 1.298 | 4350 | 4380 | 0.678 |
| 1942 | 1 | -- | 1394 | 0.008 | 1.083 | 5240 | 5270 | 0.567 |
| 1943 | 1 | -- | 1394 | 0.008 | 1.706 | 5890 | 5930 | 0.480 |
| 1944 | 1 | -- | 1394 | 0.008 | 1.546 | 6730 | 6770 | 0.388 |
| 1945 | 1 | -- | 1394 | 0.008 | 1.530 | 4930 | 4960 | 0.610 |
| 1946 | 1 | -- | 1394 | 0.008 | 0.704 | 8050 | 8090 | 0.278 |
| 1947 | 1 | -- | 1394 | 0.008 | 2.233 | 6400 | 6440 | 0.422 |
| 1948 | 1 | -- | 1394 | 0.008 | 1.188 | 6670 | 6710 | 0.394 |
| 1949 | 1 | -- | 1394 | 0.009 | 0.061 | 6310 | 6340 | 0.432 |
| 1950 | 1 | -- | 1394 | 0.009 | 1.691 | 5590 | 5620 | 0.518 |
| 1951 | 1 | -- | 1394 | 0.009 | 2.124 | 6940 | 6970 | 0.369 |
| 1952 | 1 | -- | 1394 | 0.009 | 0.587 | 5230 | 5260 | 0.569 |
| 1953 | 1 | -- | 1394 | 0.009 | 1.517 | 3970 | 3990 | 0.726 |
| 1954 | 1 | -- | 1394 | 0.009 | 1.893 | 2630 | 2650 | 0.872 |
| 1955 | 1 | -- | 1394 | 0.009 | 3.101 | 8900 | 8940 | 0.218 |
| 1956 | 1 | -- | 1394 | 0.009 | 0.489 | 3790 | 3810 | 0.750 |
| 1957 | 1 | -- | 1394 | 0.009 | 0.656 | 1340 | 1350 | 0.961 |
| 1958 | 1 | -- | 1394 | 0.009 | 1.147 | 3320 | 3340 | 0.801 |
| 1959 | 1 | -- | 1394 | 0.009 | 0.373 | 7100 | 7130 | 0.356 |
| 1960 | 1 | -- | 1456 | 0.010 | 0.383 | 8500 | 8530 | 0.246 |
| 1961 | 1 | -- | 1456 | 0.010 | 2.433 | 4690 | 4710 | 0.638 |
| 1962 | 1 | -- | 1456 | 0.010 | 0.324 | 7100 | 7130 | 0.356 |
| 1963 | 1 | 2 | 1456 | 0.010 | 0.539 | 3600 | 3620 | 0.770 |
| 1964 | 1 | -- | 1456 | 0.010 | 1.467 | 2380 | 2390 | 0.894 |
| 1965 | 1 | -- | 1456 | 0.010 | 1.057 | 5910 | 5930 | 0.479 |
| 1966 | 1 | -- | 1456 | 0.010 | 1.538 | 5240 | 5260 | 0.569 |
| 1967 | 1 | -- | 1456 | 0.010 | 0.824 | 4500 | 4520 | 0.661 |
| 1968 | 1 | -- | 1456 | 0.010 | 0.689 | 1690 | 1700 | 0.942 |
| 1969 | 1 | 2 | 1456 | 0.010 | 0.292 | 8000 | 8020 | 0.283 |
| 1970 | 1 | -- | 1456 | 0.011 | 1.806 | 9820 | 9850 | 0.172 |
| 1971 | 1 | 2 | 1456 | 0.011 | 0.525 | 9000 | 9020 | 0.212 |
| 1972 | 1 | -- | 1456 | 0.011 | 1.377 | 7600 | 7620 | 0.315 |
| 1973 | 1 | -- | 1456 | 0.011 | 1.911 | 10900 | 10900 | 0.130 |
| 1974 | 1 | -- | 1456 | 0.011 | 1.655 | 12100 | 12100 | 0.092 |
| 1975 | 1 | -- | 1456 | 0.011 | 0.002 | 6160 | 6170 | 0.451 |
| 1976 | 1 | -- | 1456 | 0.011 | 1.310 | 6740 | 6750 | 0.389 |
| 1977 | 1 | -- | 1456 | 0.012 | 1.038 | 2300 | 2310 | 0.901 |
| 1978 | 1 | -- | 1456 | 0.012 | 1.574 | 8100 | 8110 | 0.276 |
| 1979 | 1 | -- | 1456 | 0.012 | 0.372 | 12000 | 12000 | 0.094 |
| 1980 | 1 | -- | 1456 | 0.012 | 0.921 | 2500 | 2510 | 0.884 |
| 1981 | 1 | -- | 1456 | 0.012 | 2.187 | 7870 | 7880 | 0.294 |
| 1982 | 1 | -- | 1456 | 0.012 | 1.198 | 7910 | 7920 | 0.291 |
| 1983 | 1 | -- | 1456 | 0.012 | 1.356 | 7870 | 7880 | 0.294 |
| 1984 | 1 | -- | 1456 | 0.012 | 0.678 | 4450 | 4460 | 0.668 |
| 1985 | 1 | -- | 1456 | 0.012 | 1.068 | 8060 | 8070 | 0.280 |
| 1986 | 1 | -- | 1456 | 0.012 | 1.510 | 8560 | 8570 | 0.243 |
| 1987 | 1 | -- | 1456 | 0.012 | 2.102 | 10100 | 10100 | 0.162 |
| 1988 | 1 | -- | 1456 | 0.012 | 0.625 | 6430 | 6440 | 0.422 |
| 1989 | 1 | -- | 1456 | 0.012 | 1.168 | 3380 | 3380 | 0.795 |
| 1990 | 1 | -- | 1456 | 0.013 | 2.047 | 10100 | 10100 | 0.162 |
| 1991 | 1 | -- | 1456 | 0.013 | 0.848 | 6710 | 6720 | 0.393 |
| 1992 | 1 | -- | 1456 | 0.013 | 1.969 | 5550 | 5550 | 0.527 |
| 1993 | 1 | -- | 1456 | 0.013 | 1.894 | 9600 | 9610 | 0.183 |
| 1994 | 1 | -- | 1456 | 0.013 | 0.775 | 7370 | 7370 | 0.335 |
| 1995 | 1 | -- | 1456 | 0.013 | 1.337 | 7050 | 7050 | 0.362 |
| 1996 | 1 | -- | 1456 | 0.013 | 0.980 | 8180 | 8180 | 0.271 |
| 1997 | 1 | -- | 1456 | 0.013 | 2.229 | 10300 | 10300 | 0.154 |
| 1998 | 1 | -- | 1456 | 0.013 | 0.926 | 4800 | 4800 | 0.628 |
| 1999 | 1 | -- | 1456 | 0.013 | 2.490 | 10300 | 10300 | 0.154 |
| 2000 | 1 | -- | 1456 | 0.013 | 0.788 | 4480 | 4480 | 0.665 |
| 2001 | 1 | -- | 1456 | 0.013 | 0.744 | 6520 | 6520 | 0.413 |
| 2002 | 1 | -- | 1456 | 0.013 | 2.216 | 9520 | 9520 | 0.186 |
| 2003 | 1 | -- | 1456 | 0.013 | 1.083 | 5340 | 5340 | 0.557 |
| 2004 | 1 | -- | 1456 | 0.013 | 1.142 | 5840 | 5840 | 0.490 |
| 2005 | 1 | E | 1456 | 0.013 | 0.562 | 2490 | 2490 | 0.886 |
| 2006 | 1 | E | 1456 | 0.013 | 0.783 | 996 | 996 | 0.980 |
| 2007 | 1 | -- | 1456 | 0.013 | 0.519 | 7610 | 7610 | 0.316 |
| 2008 | 1 | -- | 1456 | 0.013 | 3.894 | 9110 | 9110 | 0.206 |
| 2009 | 1 | -- | 1456 | 0.014 | 0.765 | 9930 | 9930 | 0.169 |