Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540160 EAST BRANCH DU PAGE RIVER NEAR DOWNERS 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
1955 1 7 420 0.480 3.913 1590 2190 0.007
1961 1 -- 420 0.614 2.197 652 876 0.162
1963 1 -- 420 0.648 1.376 299 438 0.784
1964 1 -- 420 0.665 0.838 227 351 0.913
1965 1 -- 420 0.681 1.198 265 385 0.867
1966 1 -- 420 0.698 1.577 993 1210 0.047
1967 1 -- 420 0.715 1.423 675 828 0.189
1968 1 -- 420 0.732 2.182 728 877 0.162
1969 1 -- 420 0.749 1.342 420 523 0.630
1970 1 -- 420 0.765 1.264 725 848 0.178
1971 1 -- 420 0.774 0.313 321 403 0.839
1972 1 -- 420 0.783 2.469 1720 1920 0.011
1973 1 -- 420 0.791 0.859 786 897 0.152
1974 1 2 420 0.800 0.545 530 616 0.472
1975 1 -- 420 0.808 1.244 661 747 0.260
1976 1 -- 420 0.817 1.071 575 653 0.412
1990 1 C 420 0.872 1.378 881 933 0.133
1991 1 C 516 0.873 1.770 747 792 0.217
1992 1 CD 516 0.874 0.739 393 427 0.803
1993 1 C 516 0.874 0.884 464 500 0.680
1994 1 C 516 0.875 1.872 617 658 0.405
1995 1 C 516 0.876 1.239 538 575 0.538
1996 1 C 516 0.876 3.897 936 987 0.106
1997 1 C 516 0.877 2.432 925 975 0.112
1998 1 C 516 0.878 1.389 547 583 0.525
1999 1 C 535 0.878 0.653 517 552 0.577
2000 1 C 535 0.879 1.315 535 570 0.547
2001 1 C 535 0.885 0.714 460 489 0.702
2002 1 C 535 0.890 1.967 1040 1080 0.072
2003 1 C 535 0.896 1.854 538 562 0.559
2004 1 C 535 0.901 1.458 372 390 0.858
2005 1 CE 535 0.907 1.420 517 534 0.608
2006 1 C 535 0.912 2.255 386 398 0.846
2007 1 C 535 0.918 3.122 840 853 0.177
2008 1 C 535 0.924 3.339 1190 1200 0.047
2009 1 C 535 0.929 1.113 1040 1050 0.084