Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05533200 SAWMILL CREEK TRIBUTARY NEAR TIEDTVILLE, 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 0.600 2.199 200 292 0.263
1962 1 -- 0 0.626 0.420 178 262 0.389
1963 1 -- 0 0.653 1.400 49 97 0.981
1964 1 4B 0 0.679 0.420 48 91 0.984
1965 1 -- 0 0.706 0.980 219 289 0.272
1966 1 -- 0 0.732 4.049 254 323 0.191
1967 1 -- 0 0.759 1.180 225 283 0.293
1968 1 -- 0 0.785 3.069 257 311 0.213
1969 1 -- 0 0.812 1.739 202 246 0.460
1970 1 -- 0 0.838 1.230 166 199 0.673
1971 1 -- 0 0.850 0.560 168 199 0.676
1972 1 -- 0 0.863 1.450 256 290 0.269
1973 1 -- 0 0.875 0.600 300 333 0.176
1974 1 -- 0 0.887 1.609 282 310 0.216
1975 1 -- 0 0.899 2.299 286 311 0.214
1976 1 -- 0 0.912 0.960 315 338 0.169
1977 1 -- 0 0.924 1.360 289 307 0.223
1979 1 -- 0 0.948 1.140 276 287 0.277