Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05535300 WF OF NB 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
1961 1 -- 0 0.242 1.383 166 357 0.593
1962 1 -- 0 0.260 0.249 128 296 0.760
1963 1 -- 0 0.277 1.130 111 266 0.829
1964 1 -- 0 0.294 1.779 162 336 0.649
1965 1 -- 0 0.311 0.504 160 328 0.670
1966 1 -- 0 0.328 0.417 245 448 0.364
1967 1 -- 0 0.345 1.470 325 545 0.188
1968 1 -- 0 0.363 1.146 112 249 0.870
1969 1 -- 0 0.380 1.287 301 499 0.251
1970 1 -- 0 0.397 1.335 265 450 0.359
1971 1 -- 0 0.411 0.386 193 345 0.624
1972 1 -- 0 0.424 0.693 387 599 0.144
1973 1 -- 0 0.438 1.386 299 476 0.296
1974 1 -- 0 0.451 0.524 231 384 0.519
1975 1 -- 0 0.465 0.953 178 310 0.724
1976 1 -- 0 0.478 0.976 256 409 0.459