Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05536560 MELVINA DITCH NEAR OAK LAWN, 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 -- 0 0.972 0.283 137 382 0.140
1963 1 2 0 0.973 1.608 67 187 0.776
1964 1 2 0 0.974 0.783 35 98 0.983
1965 1 2 0 0.975 0.496 56 156 0.895
1966 1 -- 0 0.976 1.591 143 397 0.121
1967 1 -- 0 0.977 1.179 91 253 0.493
1968 1 -- 0 0.978 1.507 117 324 0.227
1969 1 -- 0 0.979 0.735 79 219 0.634
1970 1 -- 0 0.981 1.232 183 505 0.045
1971 0 -- 165 0.981 0.452 100 215 0.656
1972 0 -- 165 0.981 1.142 104 173 0.830
1973 0 -- 165 0.982 1.272 110 142 0.932
1974 2 -- 165 0.982 1.012 166 167 0.856
1975 2 -- 165 0.982 1.361 231 231 0.575
1976 2 -- 165 0.983 0.983 408 409 0.106
1977 2 -- 165 0.983 1.566 234 234 0.564
1978 2 -- 165 0.983 1.025 256 256 0.478
1979 2 -- 165 0.984 1.164 352 352 0.179
1980 2 -- 165 0.984 1.022 230 230 0.581