Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05534300 NORTH BRANCH CHICAGO RIVER AT LAKE FOREST, 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 0.070 1.144 124 282 0.696
1962 1 -- 0 0.077 0.211 192 391 0.408
1963 1 -- 0 0.084 1.445 107 253 0.775
1964 1 -- 0 0.091 0.833 134 292 0.667
1965 1 -- 0 0.098 0.178 167 343 0.527
1966 1 -- 0 0.105 0.587 225 428 0.324
1967 1 -- 0 0.112 0.963 240 445 0.286
1968 1 2 0 0.119 0.386 108 247 0.790
1969 1 -- 0 0.126 2.806 299 524 0.172
1970 1 -- 0 0.133 2.285 290 507 0.188
1971 1 -- 0 0.143 0.311 255 455 0.267
1972 1 -- 0 0.152 3.948 295 507 0.188
1973 1 -- 0 0.162 1.589 242 432 0.313
1974 1 -- 0 0.172 1.445 230 414 0.354
1975 1 2 0 0.181 1.398 90 207 0.880
1976 1 -- 0 0.191 2.210 196 360 0.485