Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540091 SPRING BK AT FOREST PRESERVE NR 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
1992 1 CE 0 0.729 2.198 118 152 0.782
1993 1 C 0 0.731 0.983 194 237 0.363
1994 1 C 0 0.732 2.696 297 352 0.096
1995 1 C 0 0.734 1.583 213 256 0.276
1996 1 C 0 0.736 7.806 393 457 0.036
1997 1 C 0 0.738 2.723 310 365 0.083
1998 1 C 0 0.740 1.122 179 219 0.451
1999 1 C 0 0.742 0.892 203 244 0.327
2000 1 C 0 0.743 1.646 282 331 0.123
2001 1 C 0 0.761 0.970 177 212 0.484
2002 1 C 0 0.779 3.568 364 411 0.051
2003 1 C 0 0.797 2.139 178 205 0.515
2004 1 C 0 0.815 0.885 180 203 0.523
2005 1 CE 0 0.832 1.465 190 210 0.492
2006 1 C 0 0.850 2.473 201 217 0.457
2007 1 C 0 0.868 3.356 333 349 0.099
2008 1 C 0 0.886 2.990 391 403 0.055
2009 1 C 0 0.903 1.025 372 378 0.072