Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528400 DES PLAINES RIVER AT WHEELING, 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
1962 1 -- 7266 0.136 0.003 2300 3250 0.293
1963 1 -- 7266 0.140 1.412 660 1150 0.919
1967 1 -- 7483 0.158 0.774 1730 2490 0.509
1969 1 -- 7483 0.166 1.365 1940 2740 0.431
1970 1 -- 7483 0.171 1.659 3240 4310 0.133
1972 1 -- 8383 0.184 1.065 1870 2600 0.472
1973 1 -- 8383 0.191 1.392 2450 3270 0.287
1974 1 -- 8383 0.197 0.285 2100 2850 0.397
1975 1 -- 8383 0.204 0.873 1160 1680 0.784
1976 1 -- 8383 0.211 0.021 2400 3160 0.314
1977 1 -- 8383 0.217 0.825 610 975 0.946