Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05550430 EAST BRANCH POPLAR CREEK NEAR PALATINE, 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 -- 633 0.178 1.270 72 100 0.383
1962 1 -- 633 0.193 0.269 88 117 0.259
1963 1 -- 633 0.208 2.007 41 59 0.774
1964 1 -- 633 0.224 3.865 22 35 0.941
1965 1 -- 633 0.239 0.579 61 81 0.561
1966 1 -- 633 0.254 0.559 92 115 0.269
1967 1 -- 633 0.270 1.226 275 321 0.012
1968 1 2 633 0.285 4.144 71 89 0.482
1969 1 -- 633 0.300 2.457 88 106 0.332
1970 1 -- 633 0.316 2.866 80 96 0.415
1971 1 -- 633 0.331 0.240 76 90 0.468
1972 1 -- 633 0.346 1.748 96 110 0.301
1973 1 -- 633 0.361 2.197 164 183 0.065
1974 1 -- 633 0.376 1.128 106 118 0.252
1975 1 -- 633 0.391 1.847 86 95 0.423
1976 1 -- 633 0.406 1.887 114 123 0.224
1977 1 -- 633 0.421 1.598 63 68 0.690