Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540080 SPRING BROOK AT WHEATON, 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 0.741 1.703 158 201 0.219
1962 1 2 0 0.749 0.303 70 101 0.870
1963 1 -- 0 0.756 1.850 103 136 0.620
1964 1 -- 0 0.764 3.628 120 155 0.491
1965 1 -- 0 0.771 1.729 147 184 0.296
1966 1 -- 0 0.779 1.973 144 180 0.325
1967 1 -- 0 0.786 1.635 166 202 0.215
1968 1 -- 0 0.794 3.492 222 266 0.083
1969 1 -- 0 0.801 1.479 177 212 0.187
1970 1 -- 0 0.809 1.274 152 183 0.299
1971 1 -- 0 0.821 1.081 147 176 0.350
1972 1 -- 0 0.834 4.240 552 617 0.004
1973 1 -- 0 0.846 1.764 152 177 0.342
1974 1 -- 0 0.859 0.589 113 133 0.648
1975 1 -- 0 0.871 1.567 172 194 0.246
1976 1 -- 0 0.884 1.241 162 181 0.311
1977 1 -- 0 0.896 2.289 84 98 0.889
1978 1 -- 0 0.909 2.013 232 251 0.106
1979 1 -- 0 0.921 1.427 178 191 0.257