Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528440 BUFFALO CREEK NEAR LAKE ZURICH, 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 0.333 1.214 44 109 0.809
1962 1 2 0 0.342 0.261 53 122 0.724
1963 1 -- 0 0.350 1.258 34 94 0.902
1964 1 -- 0 0.358 1.731 30 88 0.929
1965 1 -- 0 0.367 0.094 72 147 0.531
1966 1 -- 0 0.375 0.475 64 134 0.629
1967 1 -- 0 0.384 0.923 64 133 0.636
1968 1 2 0 0.392 1.246 52 115 0.769
1969 1 -- 0 0.400 1.340 76 149 0.518
1970 1 -- 0 0.409 1.509 193 315 0.042
1971 1 -- 0 0.455 0.415 83 152 0.496
1972 1 -- 0 0.501 1.197 203 308 0.045
1973 1 -- 0 0.547 1.434 121 188 0.264
1974 1 -- 0 0.593 1.113 125 186 0.273
1975 1 -- 0 0.639 0.820 155 216 0.171
1976 1 -- 0 0.685 1.256 118 165 0.413