Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05529000 DES PLAINES RIVER NEAR DES PLAINES, 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
1941 1 -- 6283 0.042 0.190 1430 2540 0.668
1942 1 -- 6283 0.045 0.439 2060 3440 0.422
1943 1 -- 6283 0.048 0.102 2470 3960 0.307
1944 1 -- 6283 0.051 1.199 2470 3950 0.309
1945 1 -- 6283 0.055 1.322 1830 3080 0.515
1946 1 -- 6283 0.058 0.706 2510 3980 0.303
1947 1 -- 6283 0.061 1.205 1920 3190 0.484
1948 1 -- 6283 0.064 1.804 3490 5280 0.136
1949 1 -- 6283 0.067 0.310 1700 2860 0.582
1950 1 -- 6283 0.070 1.460 4040 6020 0.086
1951 1 -- 6283 0.077 0.133 2410 3800 0.341
1952 1 -- 6283 0.084 1.286 2690 4120 0.276
1953 1 E 6283 0.091 0.565 669 1370 0.931
1954 1 -- 6283 0.099 1.332 1770 2870 0.579
1955 1 -- 6283 0.106 2.404 1800 2890 0.573
1956 1 E 6283 0.113 1.235 880 1630 0.890
1957 1 -- 6653 0.120 1.312 2610 3910 0.318
1958 1 -- 6653 0.128 0.146 1220 2060 0.796
1959 1 E 6653 0.135 1.266 1190 2010 0.809
1960 1 -- 6822 0.142 0.604 4670 6480 0.068
1961 1 -- 6822 0.148 0.425 1150 1920 0.828
1962 1 E 7316 0.154 0.003 2820 4040 0.290
1963 1 E 7316 0.161 1.395 732 1340 0.934
1964 1 E 7533 0.167 0.715 840 1480 0.916
1965 1 -- 7533 0.173 0.541 2160 3170 0.491
1966 1 -- 7533 0.179 0.496 1920 2840 0.588
1967 1 -- 7533 0.185 1.413 2820 3940 0.310
1968 1 E 7533 0.192 1.006 1730 2560 0.663
1969 1 -- 7533 0.198 1.372 2430 3440 0.423
1970 1 -- 7533 0.204 1.647 3620 4830 0.175
1971 1 -- 7533 0.212 0.077 2440 3400 0.432
1972 1 -- 8433 0.220 1.029 2710 3700 0.363
1973 1 -- 8433 0.229 1.385 2900 3890 0.321
1974 1 -- 8433 0.237 0.652 2480 3370 0.440
1975 1 -- 8433 0.245 0.848 1810 2520 0.675
1976 1 -- 8433 0.253 1.306 2600 3460 0.418
1977 1 E 8433 0.261 0.825 514 863 0.980
1978 1 -- 8433 0.270 1.280 1960 2630 0.643
1979 1 -- 8433 0.278 0.300 3430 4310 0.240
1980 1 -- 8433 0.286 0.294 1440 1980 0.816
1981 1 -- 8433 0.292 1.148 1700 2270 0.746
1982 1 -- 8433 0.298 1.900 3920 4800 0.179
1983 1 -- 8653 0.304 1.529 3900 4750 0.183
1984 1 E 8653 0.310 0.500 1830 2370 0.717
1985 1 -- 8653 0.316 1.081 3490 4240 0.252
1986 1 -- 8653 0.321 0.597 2890 3560 0.394
1987 1 -- 8653 0.327 0.804 4900 5810 0.096
1988 1 -- 8653 0.333 0.567 1810 2290 0.740
1989 1 E 8653 0.339 1.064 1930 2410 0.708
1990 1 -- 9153 0.345 1.566 2430 2960 0.552
1991 1 -- 9153 0.351 0.880 2170 2640 0.641
1992 1 DE 9153 0.357 0.784 1220 1570 0.902
1993 1 C 9153 0.362 0.920 2660 3160 0.494
1994 1 C 9259 0.368 0.742 2700 3190 0.488
1995 1 C 9259 0.374 1.172 2470 2910 0.565
1996 1 C 9259 0.380 0.975 3850 4390 0.229
1997 1 C 9259 0.385 1.891 3540 4030 0.290
1998 1 C 9259 0.391 0.590 1860 2190 0.764
1999 1 C 9259 0.397 1.160 3420 3870 0.325
2000 1 C 9259 0.403 0.086 2460 2810 0.596
2001 1 C 9259 0.414 1.825 2090 2380 0.716
2002 1 C 9259 0.425 1.345 2970 3290 0.462
2003 1 CE 9259 0.437 0.602 1630 1830 0.849
2004 1 C 9259 0.448 0.087 3760 4030 0.291
2005 1 CE 9259 0.460 0.464 1860 2010 0.808
2006 1 C 9259 0.471 0.950 2030 2160 0.773
2007 1 C 9259 0.482 1.039 3780 3910 0.313
2008 1 C 9259 0.494 2.483 3010 3090 0.515
2009 1 C 9259 0.505 0.665 3190 3230 0.477