Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540030 WEST BRANCH DU PAGE RIVER AT WEST CHICAGO, 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
1955 1 7 558 0.232 3.467 1260 2130 0.053
1961 1 -- 558 0.329 1.383 758 1270 0.300
1962 1 -- 558 0.345 0.285 688 1170 0.387
1963 1 2 558 0.362 1.340 415 781 0.761
1964 1 2 558 0.379 2.080 550 948 0.596
1965 1 2 558 0.395 0.115 460 815 0.728
1966 1 -- 558 0.412 1.454 1020 1520 0.172
1967 1 -- 558 0.429 1.276 1080 1580 0.154
1968 1 -- 558 0.445 1.908 748 1150 0.406
1969 1 2 558 0.462 1.355 520 840 0.705
1970 1 -- 558 0.479 1.416 730 1100 0.456
1971 1 2 558 0.500 0.345 506 793 0.751
1972 1 -- 558 0.521 1.989 1670 2200 0.046
1973 1 -- 558 0.541 0.802 869 1200 0.366
1974 1 -- 558 0.562 0.599 740 1020 0.524
1975 1 -- 558 0.583 1.006 651 892 0.649
1976 1 -- 558 0.604 1.146 925 1190 0.369
1977 1 -- 788 0.625 1.339 257 399 0.975
1978 1 -- 788 0.646 0.852 584 762 0.777
1979 1 -- 788 0.667 0.281 1220 1440 0.199