Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540110 FERRY CREEK AT 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
1961 1 -- 0 0.131 1.352 81 121 0.508
1962 1 -- 0 0.136 0.301 71 107 0.611
1963 1 -- 0 0.141 1.314 40 67 0.871
1964 1 -- 0 0.146 1.797 214 285 0.047
1965 1 -- 0 0.152 0.135 45 72 0.838
1966 1 -- 0 0.157 1.344 102 144 0.362
1967 1 -- 0 0.162 1.349 108 151 0.327
1968 1 -- 0 0.167 1.389 60 90 0.730
1969 1 -- 0 0.172 0.587 72 104 0.628
1970 1 -- 0 0.177 1.439 66 96 0.684
1971 1 2 1500 0.184 0.362 62 91 0.724
1972 1 -- 1500 0.191 2.184 180 234 0.087
1973 1 -- 1500 0.198 1.356 74 104 0.630
1974 1 -- 1500 0.205 1.227 93 127 0.466
1975 1 -- 1500 0.212 1.021 74 103 0.640
1976 1 -- 1500 0.219 1.108 134 173 0.223
1977 1 -- 1500 0.226 1.257 60 84 0.766
1978 1 -- 1500 0.233 1.949 187 235 0.087
1979 1 -- 1500 0.240 0.924 110 143 0.370