Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05539900 WEST BRANCH DU PAGE RIVER NEAR 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
1961 1 -- 0 0.258 1.309 450 701 0.334
1962 1 -- 0 0.280 0.277 361 580 0.518
1963 1 E 0 0.302 1.218 217 393 0.831
1964 1 -- 0 0.324 1.743 201 366 0.869
1965 1 2 0 0.345 0.131 250 416 0.798
1966 1 -- 0 0.367 1.311 537 735 0.285
1967 1 -- 0 0.389 1.194 805 1030 0.093
1968 1 -- 0 0.411 1.556 340 489 0.676
1969 1 -- 0 0.432 1.339 399 545 0.579
1970 1 D 0 0.454 1.481 521 671 0.379
1971 1 E 0 0.477 0.367 333 452 0.742
1972 1 -- 0 0.499 1.406 715 841 0.186
1973 1 -- 0 0.521 0.770 535 646 0.417
1974 1 -- 0 0.544 0.616 522 619 0.459
1975 1 -- 0 0.566 0.844 537 621 0.456
1976 1 -- 0 0.589 1.146 557 628 0.446
1977 0 E 230 0.611 0.865 158 225 0.974
1978 2 -- 230 0.633 0.929 468 581 0.519
1979 2 D 230 0.656 0.832 779 910 0.151
1980 2 -- 230 0.678 0.687 311 383 0.844
1981 2 -- 230 0.683 0.550 483 567 0.541
1982 2 -- 230 0.688 0.343 673 767 0.245
1983 2 -- 230 0.693 1.739 984 1100 0.072
1984 2 E 230 0.698 0.599 392 460 0.729
1985 2 -- 230 0.704 1.277 706 792 0.223
1986 2 E 230 0.709 0.804 613 692 0.345
1987 2 -- 230 0.714 2.239 958 1060 0.085
1988 2 E 230 0.719 0.857 377 434 0.770
1989 2 E 230 0.724 1.214 549 614 0.467
1990 2 E 230 0.729 1.416 571 634 0.436
1991 2 -- 230 0.732 1.701 470 524 0.614
1992 2 E 230 0.735 1.551 278 322 0.922
1993 2 C 230 0.738 0.790 460 510 0.640
1994 2 C 230 0.742 5.058 786 849 0.184
1995 2 C 230 0.745 2.127 643 698 0.334
1996 2 C 230 0.748 1.820 592 644 0.422
1997 2 CE 230 0.751 2.511 892 954 0.129
1998 2 CE 230 0.754 1.198 623 672 0.378
1999 2 C 230 0.757 1.417 666 713 0.310
2000 2 C 230 0.761 1.404 517 556 0.558
2001 2 C 230 0.767 3.898 825 870 0.172
2002 2 C 230 0.774 3.794 913 957 0.127
2003 2 C 230 0.780 2.269 565 594 0.499
2004 2 C 230 0.786 1.402 538 562 0.549
2005 2 CE 230 0.793 0.760 495 514 0.632
2006 2 C 230 0.799 1.608 569 586 0.512
2007 2 C 230 0.806 2.208 1040 1060 0.085
2008 2 C 230 0.812 4.266 1840 1860 0.014
2009 2 C 230 0.819 0.754 1080 1090 0.076