Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05550470 POPLAR CREEK TRIBUTARY NEAR BARTLETT, 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 0.389 1.304 97 151 0.688
1962 1 -- 0 0.433 0.274 75 123 0.845
1963 1 -- 0 0.476 1.214 72 115 0.883
1964 1 -- 0 0.519 1.760 167 206 0.375
1965 1 -- 0 0.562 0.577 128 159 0.639
1966 1 -- 0 0.605 1.295 164 188 0.473
1967 1 -- 0 0.648 1.192 565 549 0.013
1968 1 -- 0 0.691 1.573 144 154 0.671
1969 1 -- 0 0.735 0.808 173 173 0.554
1970 1 -- 0 0.778 1.495 226 211 0.344
1971 1 -- 0 0.791 0.226 201 187 0.477
1972 1 -- 0 0.805 1.361 255 229 0.254
1973 0 -- 77 0.818 1.349 248 239 0.224
1974 0 -- 154 0.832 0.624 156 166 0.594
1975 2 -- 154 0.845 0.824 158 179 0.520
1976 2 -- 154 0.859 1.299 116 133 0.796
1977 2 -- 154 0.872 0.868 102 116 0.881
1978 2 -- 154 0.886 1.385 168 182 0.505
1979 2 -- 154 0.899 0.316 346 363 0.048