Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05536510 NAVAJO CREEK AT PALOS HEIGHTS, 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 2 0 0.631 1.428 260 293 0.393
1962 1 -- 0 0.631 0.277 166 192 0.758
1963 1 -- 0 0.632 1.543 225 255 0.522
1964 1 -- 0 0.632 0.737 133 157 0.869
1965 1 -- 0 0.633 0.899 166 192 0.759
1966 1 -- 0 0.633 1.332 222 252 0.534
1967 1 -- 0 0.633 1.150 232 263 0.497
1968 1 -- 0 0.634 1.382 273 306 0.349
1969 1 -- 0 0.634 0.420 186 213 0.684
1970 1 -- 0 0.635 1.118 423 467 0.092
1971 1 -- 0 0.644 0.933 150 172 0.822
1972 1 -- 0 0.653 1.208 221 245 0.558
1973 1 -- 0 0.663 1.314 241 264 0.492
1974 1 -- 0 0.672 1.141 377 403 0.157
1975 1 -- 0 0.681 1.068 196 212 0.689
1976 1 -- 0 0.691 0.977 434 455 0.100
1977 1 -- 0 0.700 1.436 244 256 0.518
1978 1 -- 0 0.709 1.086 375 387 0.175
1979 1 -- 0 0.719 0.853 204 210 0.695