Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05527050 PRAIRIE CREEK NEAR FRANKFORT, 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
1956 1 -- 0 0.005 0.634 171 211 0.106
1957 1 -- 0 0.005 3.145 786 917 0.000
1958 1 -- 0 0.005 0.606 63 84 0.691
1959 1 2 0 0.005 1.362 100 128 0.387
1960 1 -- 0 0.005 0.412 55 74 0.757
1961 1 -- 0 0.005 1.458 140 173 0.188
1962 1 -- 0 0.005 0.302 44 61 0.837
1963 1 2 0 0.005 1.439 65 86 0.674
1964 1 2 0 0.005 1.019 10 17 1.000
1965 1 -- 0 0.005 0.979 80 104 0.545
1966 1 -- 0 0.005 1.580 92 118 0.443
1967 1 -- 0 0.005 1.181 64 85 0.682
1968 1 -- 0 0.005 1.676 96 123 0.413
1969 1 -- 0 0.005 0.713 105 134 0.357
1970 1 -- 0 0.005 1.722 105 134 0.357
1971 1 -- 0 0.006 0.289 35 50 0.895
1972 1 -- 0 0.006 1.563 170 209 0.109