Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528200 HAWTHORN DRAINAGE DITCH NEAR MUNDELEIN, 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 0 -- 910 0.452 1.970 206 -- --
1962 0 -- 1404 0.460 0.258 125 -- --
1963 1 -- 1404 0.468 1.264 106 209 0.880
1964 1 -- 1404 0.477 1.759 148 261 0.735
1965 1 -- 1404 0.485 0.563 197 323 0.532
1966 1 -- 1404 0.493 0.476 230 366 0.411
1967 1 -- 1404 0.502 1.284 273 413 0.276
1968 1 -- 1404 0.510 1.195 277 415 0.271
1969 1 -- 1404 0.518 1.362 416 595 0.079
1970 1 -- 1404 0.527 1.525 543 748 0.034
1971 1 -- 1404 0.550 0.417 214 326 0.524
1972 1 -- 1404 0.572 1.203 433 590 0.081
1973 1 -- 1404 0.595 1.421 146 230 0.825
1974 1 -- 1404 0.618 0.641 152 231 0.821
1975 1 2 1404 0.641 0.784 206 288 0.645
1976 1 -- 1404 0.664 1.272 100 160 0.956