Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540150 EAST BR DU PAGE RIVER AT GLEN ELLYN, 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 0.546 2.083 207 310 0.441
1963 1 -- 0 0.582 1.336 82 148 0.948
1964 1 2 0 0.600 0.815 64 119 0.974
1965 1 2 0 0.619 0.113 107 171 0.909
1966 1 -- 0 0.637 1.450 468 591 0.048
1967 1 -- 0 0.655 1.419 303 387 0.217
1968 1 -- 0 0.673 1.865 220 289 0.511
1969 1 -- 0 0.691 1.318 227 292 0.501
1970 1 -- 0 0.709 1.263 354 428 0.164
1971 1 2 0 0.722 0.327 145 191 0.852
1972 1 -- 0 0.735 2.026 912 1040 0.008
1973 1 -- 0 0.749 0.842 278 331 0.370
1974 1 -- 0 0.762 0.533 242 287 0.516
1975 1 -- 0 0.775 1.168 303 349 0.307
1976 1 -- 0 0.788 1.028 318 360 0.275
1978 1 -- 0 0.815 1.529 227 255 0.629
1979 1 -- 0 0.828 0.978 360 390 0.213
1980 1 -- 0 0.842 0.333 218 239 0.701