Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05534400 NORTH BRANCH CHICAGO RIVER AT BANNOCKBURN, 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
1960 1 -- 0 0.113 0.467 321 606 0.243
1961 1 -- 0 0.122 1.199 175 385 0.663
1962 1 -- 0 0.132 0.220 250 503 0.421
1963 1 -- 0 0.141 1.368 117 291 0.850
1964 1 -- 0 0.151 0.810 174 375 0.687
1965 1 -- 0 0.160 0.538 202 414 0.605
1966 1 -- 0 0.170 0.546 269 515 0.397
1967 1 -- 0 0.179 1.372 355 623 0.221
1968 1 2 0 0.189 0.506 145 320 0.799
1969 1 -- 0 0.198 2.440 319 569 0.301
1970 1 -- 0 0.208 2.055 278 512 0.403
1971 1 2 0 0.218 0.329 300 538 0.357
1972 1 -- 0 0.228 3.167 339 582 0.280
1973 1 -- 0 0.238 1.420 327 563 0.311
1974 1 -- 0 0.248 1.223 268 480 0.465
1975 1 -- 0 0.259 0.409 156 316 0.807
1976 1 -- 0 0.269 1.912 282 492 0.443