Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05536630 MILL CREEK AT PALOS PARK, 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
1955 1 7 0 0.233 3.301 2050 2610 0.000
1961 1 2 143 0.324 1.419 174 237 0.518
1962 1 2 143 0.336 0.282 117 166 0.782
1963 1 2 143 0.347 1.533 109 154 0.820
1964 1 -- 143 0.359 0.736 61 94 0.954
1965 1 2 143 0.371 0.885 107 147 0.840
1966 1 -- 143 0.382 1.425 558 659 0.024
1967 1 2 143 0.394 1.153 251 307 0.290
1968 1 -- 143 0.405 1.421 130 168 0.776
1969 1 2 143 0.417 0.407 98 129 0.892
1970 1 -- 143 0.429 1.092 526 603 0.033
1971 1 2 143 0.437 0.902 59 80 0.968
1972 1 -- 143 0.445 1.212 188 224 0.568
1973 1 -- 143 0.453 1.344 125 153 0.825
1974 1 -- 143 0.462 1.139 411 463 0.080
1975 1 -- 143 0.470 1.075 429 480 0.071
1976 1 -- 143 0.478 0.986 309 345 0.205
1977 1 -- 143 0.486 1.448 130 152 0.827
1978 1 -- 143 0.495 1.076 325 357 0.188
1979 1 -- 143 0.503 0.862 762 817 0.014