Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05551675 BLACKBERRY CREEK NEAR MONTGOMERY, 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
1998 1 C 283 0.219 0.863 603 736 0.291
1999 1 C 283 0.225 1.128 1040 1230 0.062
2000 1 C 283 0.231 1.578 278 359 0.802
2001 1 C 283 0.250 0.664 544 652 0.386
2002 1 C 438 0.269 1.553 608 709 0.320
2003 1 CE 438 0.288 1.009 344 407 0.739
2004 1 CE 438 0.307 1.608 425 485 0.623
2005 1 CE 438 0.325 0.746 255 294 0.879
2006 1 CE 633 0.344 0.902 143 165 0.967
2007 1 7C 633 0.363 0.513 754 796 0.236
2008 1 C 1114 0.382 4.117 1740 1790 0.018
2009 1 C 1114 0.401 0.902 821 836 0.204