Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540195 ST. JOSEPH CREEK AT ROUTE 34 AT LISLE, 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
1989 1 C 0 0.920 2.223 464 486 0.506
1990 1 C 0 0.920 1.748 938 970 0.048
1991 1 C 0 0.920 1.709 715 742 0.143
1992 1 CD 0 0.920 1.336 560 583 0.297
1993 1 C 0 0.920 1.091 390 410 0.677
1994 1 C 0 0.920 1.572 542 565 0.337
1995 1 CE 0 0.920 1.219 322 340 0.821
1996 1 C 0 0.920 5.119 1280 1320 0.018
1997 1 C 0 0.920 2.545 898 929 0.057
1998 1 C 0 0.920 1.828 641 665 0.196
1999 1 C 0 0.920 1.485 491 513 0.451
2000 1 C 0 0.920 1.307 474 495 0.486
2001 1 C 0 0.924 0.756 429 447 0.583
2002 1 C 0 0.928 2.020 796 819 0.096
2003 1 C 0 0.932 1.124 404 418 0.655
2004 1 C 0 0.936 1.520 533 547 0.381
2005 1 CE 0 0.940 1.577 467 478 0.522
2006 1 C 0 0.944 2.258 346 353 0.796
2007 1 C 0 0.948 3.274 975 985 0.046
2008 1 C 0 0.952 2.868 764 770 0.125
2009 1 C 0 0.956 2.344 886 889 0.068