Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540130 WEST BRANCH DU PAGE RIVER NEAR NAPERVILLE, 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 8320 0.659 2.211 977 1200 0.869
1990 1 C 8320 0.665 1.828 2290 2600 0.233
1991 1 C 8320 0.669 1.414 3420 3820 0.063
1992 1 CD 8562 0.672 1.525 2020 2300 0.343
1993 1 C 9012 0.675 1.691 1530 1760 0.598
1994 1 C 9012 0.679 3.016 2320 2600 0.233
1995 1 C 9012 0.682 1.549 2150 2410 0.293
1996 1 C 9012 0.686 4.474 6620 7170 0.009
1997 1 C 9012 0.689 2.527 3260 3590 0.079
1998 1 C 9012 0.692 1.162 2020 2250 0.364
1999 1 C 9012 0.696 0.805 1960 2180 0.398
2000 1 CE 10410 0.699 1.472 2040 2260 0.361
2001 1 C 10410 0.709 0.716 1910 2100 0.435
2002 1 C 10410 0.719 2.452 3090 3320 0.108
2003 1 C 10410 0.728 1.809 1530 1660 0.652
2004 1 CD 10410 0.738 1.224 1580 1690 0.634
2005 1 CE 10410 0.748 0.919 1450 1540 0.717
2006 1 CE 10410 0.758 1.426 1110 1180 0.878
2007 1 C 10410 0.767 1.418 1940 2000 0.480
2008 1 C 10410 0.777 4.208 4160 4230 0.044
2009 1 C 10410 0.787 1.054 2640 2660 0.216