Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528360 APTAKISIC CREEK AT APTAKISIC, 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 0.062 1.379 34 172 0.938
1962 1 2 0 0.064 0.249 100 292 0.558
1963 1 -- 0 0.066 1.128 38 180 0.927
1964 1 -- 0 0.069 1.774 47 195 0.890
1965 1 2 0 0.071 0.091 78 250 0.713
1966 1 2 0 0.073 0.416 79 251 0.708
1967 1 -- 0 0.075 1.466 147 371 0.299
1968 1 -- 0 0.077 1.142 62 221 0.814
1969 1 2 0 0.080 1.285 123 334 0.418
1970 1 2 0 0.082 1.333 300 643 0.042
1971 1 2 0 0.112 0.385 157 377 0.280
1972 1 -- 0 0.142 0.692 390 750 0.020
1973 1 -- 0 0.172 1.383 173 386 0.255
1974 1 2 0 0.202 0.523 126 308 0.500
1975 1 -- 0 0.232 0.951 114 280 0.605
1976 1 -- 0 0.262 0.974 166 357 0.344