Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05530990 SALT CREEK AT ROLLING MEADOWS, 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
1974 1 -- 0 0.726 1.033 540 622 0.679
1975 1 -- 0 0.738 0.797 910 1000 0.222
1976 1 D 0 0.749 1.387 731 809 0.431
1977 1 E 0 0.761 1.001 213 252 0.984
1978 1 -- 0 0.773 1.671 642 695 0.573
1979 1 -- 0 0.784 0.585 755 804 0.437
1980 1 -- 0 0.796 0.909 422 452 0.885
1981 1 -- 537 0.800 1.659 575 606 0.704
1982 1 -- 537 0.804 0.533 609 638 0.656
1983 1 -- 1109 0.808 1.773 1060 1090 0.175
1984 1 -- 1109 0.812 0.703 548 570 0.749
1985 1 -- 1327 0.816 1.573 763 785 0.460
1986 1 -- 2163 0.820 0.837 887 907 0.304
1987 1 -- 2163 0.824 2.167 1650 1670 0.038
1988 1 -- 2163 0.828 0.211 535 545 0.778
1989 1 -- 2163 0.832 2.249 1110 1120 0.164
1990 1 -- 2163 0.836 2.021 1010 1020 0.215
1991 1 -- 2163 0.836 1.842 673 677 0.596
1992 1 E 2163 0.837 1.584 444 447 0.890
1993 1 CD 2163 0.838 0.999 1080 1080 0.180
1994 1 C 2163 0.838 1.899 1200 1200 0.130
1995 1 C 2163 0.839 1.838 827 830 0.406
1996 1 C 2163 0.840 1.465 796 798 0.444
1997 1 C 2163 0.840 2.754 1450 1450 0.062
1998 1 CE 2163 0.841 1.421 668 669 0.608
1999 1 C 2163 0.841 1.719 1140 1140 0.156
2000 1 C 2163 0.842 2.410 837 837 0.398
2001 1 C 2163 0.842 2.444 1370 1370 0.076
2002 1 C 2163 0.842 2.297 1450 1450 0.062
2003 1 C 2163 0.842 1.605 811 811 0.429
2004 1 C 2163 0.842 1.187 854 854 0.374
2005 1 CE 2163 0.842 0.745 505 505 0.826
2006 1 C 2163 0.842 1.344 521 521 0.808
2007 1 C 2163 0.842 2.046 1400 1400 0.071
2008 1 C 2163 0.842 3.532 2510 2510 0.011
2009 1 C 2163 0.842 0.920 1470 1470 0.059