Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05537500 LONG RUN NEAR LEMONT, 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
1951 1 -- 0 0.040 1.451 390 639 0.724
1952 1 -- 0 0.047 1.254 1000 1260 0.154
1953 1 -- 0 0.054 1.418 495 742 0.602
1954 1 E 0 0.061 1.667 658 916 0.399
1955 1 -- 0 0.068 3.386 3160 3330 0.006
1956 1 -- 0 0.075 0.445 348 578 0.792
1957 1 -- 0 0.081 2.286 2390 2560 0.013
1958 1 E 0 0.088 1.474 358 582 0.789
1959 1 E 0 0.095 1.376 397 619 0.751
1960 1 -- 0 0.102 1.858 477 693 0.656
1961 1 -- 0 0.116 0.607 1000 1190 0.180
1962 1 -- 0 0.129 0.296 304 507 0.864
1963 1 E 0 0.143 1.570 348 545 0.827
1964 0 E 859 0.157 0.996 139 354 0.957
1965 2 E 859 0.170 0.890 263 594 0.776
1966 2 -- 859 0.184 1.678 1360 2150 0.020
1967 2 E 859 0.197 1.195 616 1080 0.240
1968 2 -- 859 0.211 0.995 400 772 0.561
1969 2 -- 859 0.225 0.926 333 665 0.692
1970 2 -- 859 0.238 1.006 1140 1800 0.044
1971 2 E 859 0.260 0.439 217 482 0.886
1972 2 -- 859 0.282 1.162 825 1310 0.138
1973 2 -- 859 0.304 0.826 663 1060 0.259
1974 2 -- 859 0.326 1.063 960 1450 0.093
1975 2 -- 859 0.348 1.175 1050 1540 0.074
1976 2 -- 859 0.370 0.953 500 800 0.527
1977 2 E 859 0.392 1.536 179 366 0.954
1978 2 -- 859 0.414 1.010 983 1380 0.114
1979 2 2 859 0.436 0.852 530 789 0.540
1980 2 E 859 0.458 0.867 230 405 0.938
1981 2 -- 859 0.470 2.041 1820 2310 0.018
1982 2 -- 859 0.482 0.307 795 1070 0.252
1983 2 -- 859 0.494 1.555 740 995 0.315
1984 2 -- 859 0.506 0.619 567 780 0.551
1985 2 -- 859 0.518 1.338 686 915 0.402
1986 2 -- 859 0.530 0.871 365 525 0.845
1987 2 E 859 0.542 2.159 394 552 0.820
1988 2 -- 859 0.554 0.358 302 441 0.920
1989 2 E 859 0.566 1.261 521 680 0.675
1990 2 -- 859 0.578 2.443 1200 1450 0.094
1991 2 -- 859 0.590 3.124 1050 1260 0.158
1992 2 E 859 0.602 4.020 707 865 0.455
1993 2 C 859 0.614 1.026 942 1110 0.224
1994 2 CE 859 0.626 0.747 378 482 0.887
1995 2 C 859 0.638 1.170 519 627 0.740
1996 2 C 859 0.650 4.726 5310 5810 0.000
1997 2 C 859 0.662 2.659 1670 1850 0.039
1998 2 C 859 0.674 1.965 820 924 0.392
1999 2 C 859 0.686 0.888 604 682 0.674
2000 2 C 859 0.698 1.386 568 635 0.731
2001 2 C 859 0.706 0.793 635 698 0.652
2002 2 C 859 0.715 2.351 811 876 0.444
2003 2 CE 859 0.724 3.870 1500 1580 0.067
2004 2 C 859 0.733 2.409 1090 1150 0.203
2005 2 C 859 0.742 0.938 668 704 0.645
2006 2 C 859 0.750 1.718 305 326 0.966
2007 2 C 859 0.759 2.366 859 884 0.436
2008 2 C 859 0.768 3.701 1220 1240 0.165
2009 2 C 859 0.777 1.932 1250 1260 0.157