Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05535800 NORTH BRANCH CHICAGO RIVER AT MORTON GROVE, 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
1960 1 2 0 0.500 0.385 1220 1320 0.345
1961 1 -- 0 0.512 1.402 1190 1290 0.378
1962 1 -- 0 0.524 0.227 971 1060 0.561
1963 1 -- 0 0.536 1.116 827 917 0.698
1964 1 -- 0 0.549 0.883 763 848 0.757
1965 1 -- 0 0.561 0.166 629 716 0.857
1966 1 -- 0 0.573 1.315 1280 1290 0.371
1967 1 -- 0 0.585 1.655 2130 2040 0.082
1968 1 -- 0 0.598 1.196 793 830 0.771
1969 1 -- 0 0.610 1.680 1350 1310 0.357
1970 0 -- 961 0.622 1.549 1090 1120 0.514
1971 0 -- 961 0.628 0.379 859 939 0.676
1972 0 -- 961 0.634 1.455 1440 1560 0.203
1973 0 -- 1561 0.640 1.202 1040 1210 0.435
1974 2 -- 1561 0.647 1.090 1060 1290 0.376
1975 2 -- 1561 0.653 0.798 1080 1300 0.364
1976 2 -- 1561 0.659 1.354 1500 1750 0.147
1977 2 -- 1561 0.665 0.803 661 822 0.777
1978 2 -- 1561 0.671 1.344 619 770 0.817
1979 0 -- 2961 0.677 0.824 1000 -- --