Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05530400 HIGGINS CREEK NEAR MOUNT PROSPECT, 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 0.244 2.199 63 110 0.828
1962 1 2 0 0.261 0.130 50 91 0.903
1963 1 -- 0 0.279 0.353 95 147 0.643
1964 1 -- 0 0.296 0.806 16 35 1.000
1965 1 -- 0 0.313 0.149 38 70 0.954
1966 1 -- 0 0.330 1.419 158 217 0.301
1967 1 -- 0 0.347 1.540 382 480 0.021
1968 1 -- 0 0.365 1.298 156 208 0.337
1969 1 -- 0 0.382 1.298 195 249 0.197
1970 1 2 0 0.399 1.252 343 419 0.036
1971 1 2 0 0.413 0.622 133 173 0.506
1972 1 -- 0 0.427 1.064 463 545 0.016
1973 1 -- 0 0.441 0.809 324 384 0.047
1974 1 -- 0 0.455 0.495 87 113 0.816
1975 1 -- 0 0.469 1.042 184 219 0.291
1976 1 -- 0 0.484 0.905 116 141 0.676
1977 1 -- 0 0.498 1.123 114 137 0.702
1978 1 -- 0 0.512 1.540 145 169 0.527
1979 1 -- 0 0.526 0.875 115 134 0.718