Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05439000 SOUTH BRANCH KISHWAUKEE RIVER AT DEKALB, IL

Observed annual peak-flood magnitudes were adjusted to 2010 land-use conditions on the basis of panel data regression model with fixed effect analysis. The symbols presented in the figure are: "observed annual peaks", "adjusted annual peaks", and "fraction of urbanization in the watershed"

Legend for Graph

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
1980 1 -- 0 0.047 1.083 1510 1530 0.179
1981 1 -- 0 0.047 2.171 1050 1070 0.393
1982 1 -- 0 0.048 3.382 718 730 0.655
1983 1 -- 0 0.048 1.905 3500 3540 0.016
1984 1 -- 0 0.048 0.692 787 799 0.604
1985 1 -- 0 0.049 1.348 1130 1150 0.348
1986 1 -- 0 0.049 1.227 910 923 0.495
1987 1 -- 0 0.049 2.132 1600 1620 0.156
1988 1 -- 0 0.050 0.270 694 704 0.675
1989 1 -- 0 0.050 1.244 697 707 0.673
1990 1 -- 0 0.051 0.600 671 680 0.695
1991 1 -- 0 0.051 0.708 1170 1180 0.327
1992 1 E 0 0.051 0.655 323 328 0.925
1993 1 -- 0 0.052 1.022 1310 1320 0.257
1994 1 -- 0 0.052 0.917 1260 1270 0.282
1995 1 C 0 0.053 1.082 806 814 0.591
1996 1 CD 0 0.053 4.560 2280 2300 0.055
1997 1 C 0 0.054 2.242 2170 2180 0.063
1998 1 C 0 0.054 0.984 750 756 0.635
1999 1 C 0 0.055 1.076 1080 1090 0.380
2000 1 CE 0 0.055 1.017 818 824 0.582
2001 1 C 0 0.056 0.703 1080 1090 0.381
2002 1 C 0 0.056 1.761 1090 1100 0.376
2003 1 CE 0 0.057 0.920 760 764 0.629
2004 1 C 0 0.058 1.536 1270 1270 0.280
2005 1 C 0 0.058 0.458 273 275 0.944
2006 1 CE 0 0.059 0.743 136 137 0.987
2007 1 C 0 0.060 3.858 3020 3020 0.023
2008 1 C 0 0.060 5.443 2030 2030 0.076
2009 1 C 0 0.061 1.539 1370 1370 0.235