Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540095 WEST BRANCH DU PAGE RIVER NEAR WARRENVILLE, 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
1969 1 -- 558 0.411 1.356 612 1010 0.810
1970 1 -- 558 0.425 1.405 990 1470 0.508
1971 1 E 558 0.442 0.341 641 1010 0.808
1972 1 -- 558 0.458 2.138 1980 2630 0.091
1973 1 -- 558 0.475 0.805 1200 1660 0.395
1974 1 -- 558 0.491 0.596 1200 1630 0.410
1975 1 -- 558 0.508 1.038 1080 1460 0.514
1976 1 -- 558 0.525 1.148 1520 1940 0.246
1977 1 E 788 0.541 0.911 300 487 0.982
1978 1 -- 788 0.558 1.570 916 1200 0.693
1979 1 D 788 0.574 0.274 1740 2100 0.193
1980 1 -- 788 0.591 0.818 761 985 0.823
1981 1 -- 788 0.596 1.889 970 1210 0.685
1982 1 E 788 0.601 0.362 1210 1470 0.507
1983 1 -- 788 0.606 1.973 2160 2520 0.108
1984 1 E 788 0.611 0.683 1170 1410 0.545
1985 1 -- 788 0.616 1.059 1620 1890 0.264
1986 1 E 788 0.621 0.857 1310 1560 0.457
1987 1 -- 788 0.626 2.804 3050 3450 0.035
1988 1 E 788 0.631 1.036 888 1080 0.770
1989 1 E 788 0.636 0.940 750 920 0.858
1990 1 -- 788 0.641 1.334 1520 1750 0.340
1991 1 -- 788 0.645 1.587 1310 1520 0.480
1992 1 E 1030 0.648 0.487 580 724 0.938
1993 1 C 1480 0.652 0.755 1010 1180 0.707
1994 1 C 1480 0.655 3.018 1590 1800 0.311
1995 1 C 1480 0.659 1.500 1360 1550 0.461
1996 1 C 1480 0.663 3.597 3470 3790 0.025
1997 1 C 1480 0.666 2.428 2640 2910 0.063
1998 1 C 1480 0.670 1.349 1500 1680 0.382
1999 1 C 1480 0.673 0.787 1630 1810 0.304
2000 1 CE 1480 0.677 1.499 1590 1760 0.332
2001 1 C 1480 0.687 0.644 1560 1710 0.361
2002 1 C 1480 0.697 2.131 2130 2290 0.153
2003 1 C 1480 0.707 1.736 1460 1580 0.445
2004 1 CD 1480 0.717 1.039 1240 1330 0.600
2005 1 CE 1480 0.727 0.787 1100 1170 0.713
2006 1 C 1480 0.737 1.116 1100 1160 0.722
2007 1 C 1480 0.747 1.332 1780 1830 0.290
2008 1 C 1480 0.757 4.631 4930 5000 0.012
2009 1 C 1480 0.767 1.076 2780 2800 0.071