Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05536290 LITTLE CALUMET RIVER AT SOUTH HOLLAND, 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
1947 1 5 976 0.221 2.881 4760 6670 0.034
1948 1 5 976 0.230 1.043 3810 5440 0.069
1949 1 5 976 0.239 0.901 1580 2500 0.578
1950 1 5 976 0.248 1.321 2780 3990 0.188
1951 1 5 976 0.260 2.244 3360 4730 0.112
1952 1 5 976 0.273 1.001 2480 3550 0.269
1953 1 5 976 0.285 1.406 2420 3440 0.293
1954 1 5 976 0.297 1.449 2100 3030 0.406
1955 1 5 976 0.310 3.710 4210 5600 0.063
1956 1 5 976 0.322 1.346 2420 3340 0.320
1957 1 5 976 0.334 2.240 4440 5760 0.056
1958 1 5 976 0.346 1.442 1930 2680 0.516
1959 1 5 976 0.359 1.431 2820 3680 0.238
1960 1 5 976 0.371 1.528 1860 2530 0.568
1961 1 5 976 0.378 1.876 2410 3170 0.367
1962 1 5 976 0.385 0.230 1280 1810 0.806
1963 1 5 976 0.392 1.690 1400 1940 0.768
1964 1 5 976 0.399 1.079 995 1450 0.901
1965 1 5 976 0.406 0.964 1710 2260 0.660
1966 1 5 976 0.413 1.763 3490 4290 0.156
1967 1 5 976 0.420 1.244 1890 2440 0.601
1968 1 5 976 0.427 1.852 3060 3740 0.228
1969 1 5 1515 0.434 0.505 1340 1780 0.815
1970 1 5 1515 0.441 1.389 2340 2910 0.445
1971 1 5 1515 0.448 1.023 1520 1950 0.764
1972 1 5 1515 0.455 1.319 1820 2270 0.657
1973 1 5 1515 0.462 0.910 3500 4120 0.175
1974 1 5 1515 0.469 1.465 2980 3520 0.273
1975 1 5 1515 0.476 1.372 2480 2960 0.429
1976 1 5 1568 0.483 0.856 2650 3130 0.380
1977 1 5 1568 0.490 1.213 2050 2440 0.601
1978 1 5 1568 0.497 1.192 2860 3310 0.328
1979 1 5 1568 0.504 0.714 3100 3540 0.269
1980 1 5 1568 0.511 0.852 2320 2680 0.517
1981 1 5 1568 0.513 2.033 4070 4560 0.129
1982 1 5 1568 0.515 0.507 2790 3180 0.365
1983 1 5 1568 0.518 2.204 3520 3940 0.196
1984 1 5 1568 0.520 0.927 2550 2900 0.447
1985 1 5 1568 0.522 0.942 2980 3350 0.315
1986 1 5 1568 0.525 1.229 2510 2850 0.464
1987 1 5 1568 0.527 1.321 1950 2230 0.672
1988 1 5C 2657 0.530 0.658 1470 1710 0.833
1989 1 5C 2657 0.532 1.694 3390 3750 0.227
1990 1 5C 2657 0.534 1.565 2070 2340 0.633
1991 1 5C 2657 0.538 2.900 4150 4550 0.131
1992 1 5C 2657 0.541 2.429 1650 1880 0.785
1993 1 5C 2657 0.544 2.020 3020 3320 0.322
1994 1 5C 2657 0.547 0.946 2120 2360 0.626
1995 1 5C 2657 0.551 1.030 2010 2240 0.670
1996 1 5C 2657 0.554 3.832 3870 4180 0.169
1997 1 5C 2657 0.557 2.143 3540 3820 0.215
1998 1 5C 2657 0.561 1.414 2820 3070 0.398
1999 1 5C 2657 0.564 0.720 2630 2860 0.462
2000 1 5C 2657 0.567 1.289 2160 2350 0.630
2001 1 5C 2657 0.574 0.638 2410 2590 0.546
2002 1 5C 2657 0.581 1.692 3620 3820 0.215
2003 1 5C 2657 0.589 0.907 1610 1730 0.829
2004 1 5C 2657 0.596 2.124 1820 1930 0.771
2005 1 5C 2657 0.603 1.095 2310 2410 0.610
2006 1 5C 2919 0.610 2.670 2600 2680 0.516
2007 1 5C 2919 0.617 1.819 2310 2370 0.623
2008 1 5C 2919 0.624 4.428 3930 3980 0.192
2009 1 5C 2919 0.631 1.143 2650 2670 0.520