Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05536265 LANSING DITCH NEAR LANSING, 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
1948 1 5 0 0.040 1.124 461 321 0.028
1949 1 5 0 0.044 0.766 371 266 0.056
1950 1 5 0 0.048 1.171 301 219 0.102
1951 1 5 0 0.063 2.046 425 295 0.040
1952 1 5 0 0.078 0.021 323 228 0.090
1953 1 5 0 0.093 1.106 354 245 0.071
1954 1 5 0 0.107 0.909 362 247 0.070
1955 1 5 0 0.122 3.311 302 207 0.129
1956 1 5 0 0.137 1.425 320 215 0.111
1957 1 5E 0 0.152 2.408 240 163 0.254
1958 1 5E 0 0.167 1.115 150 108 0.601
1959 1 5 0 0.182 1.253 155 109 0.590
1960 1 5 0 0.197 1.049 204 137 0.393
1961 1 5E 0 0.204 1.500 126 90 0.730
1962 1 5E 0 0.212 0.242 77 60 0.905
1963 1 5E 0 0.219 0.563 94 69 0.856
1964 1 5E 0 0.226 0.996 56 46 0.952
1965 1 5 0 0.233 0.898 165 110 0.587
1966 1 5 0 0.241 1.613 272 169 0.228
1967 1 5E 0 0.248 1.151 130 88 0.743
1968 1 5 0 0.255 1.599 260 160 0.266
1969 1 5E 0 0.262 0.923 48 38 0.969
1970 1 5E 0 0.269 1.478 135 89 0.738
1971 1 5 0 0.278 0.931 96 66 0.877
1972 1 5 0 0.286 1.073 105 70 0.852
1973 1 5 0 0.294 0.892 238 144 0.356
1974 1 5 0 0.302 1.309 228 137 0.394
1975 1 5E 0 0.310 1.313 199 120 0.507
1976 1 5 0 0.318 1.553 202 121 0.502
1977 1 5E 0 0.327 1.023 188 112 0.568
1978 1 5E 0 0.335 1.161 138 84 0.769
1979 1 5E 0 0.343 0.801 222 129 0.450
1980 1 5E 0 0.351 0.754 176 102 0.637
1981 1 5 0 0.355 1.851 204 117 0.528
1982 1 5 0 0.358 1.187 198 114 0.555
1983 1 5 0 0.361 1.477 203 116 0.538
1984 1 5 0 0.365 0.675 146 85 0.761
1985 1 5 0 0.368 0.865 187 106 0.609
1986 1 5E 0 0.372 1.077 183 104 0.627
1987 1 5E 0 0.375 1.168 136 79 0.800
1988 0 5E 1089 0.379 0.393 109 90 0.727
1989 2 5E 1089 0.382 1.428 142 163 0.254
1990 2 5E 1089 0.385 2.680 129 149 0.327
1991 2 5E 1089 0.389 3.830 197 222 0.098
1992 2 5C 1089 0.392 0.760 100 116 0.536
1993 2 5C 1089 0.395 2.000 184 207 0.130
1994 2 5C 1089 0.398 1.120 180 202 0.140
1995 2 5C 1089 0.401 0.900 120 137 0.397
1996 2 5C 1089 0.404 4.190 208 231 0.086
1997 2 5C 1089 0.407 2.060 168 187 0.174
1998 2 5C 1089 0.410 1.190 114 129 0.446
1999 2 5C 1089 0.413 0.810 150 167 0.238
2000 2 5C 1089 0.416 2.020 169 187 0.175
2001 2 5C 1089 0.427 0.800 119 132 0.426
2002 2 5C 1089 0.438 2.560 116 127 0.457
2003 2 5C 1089 0.448 1.740 169 181 0.189
2004 2 5C 1089 0.459 2.200 100 108 0.599
2005 2 5C 1089 0.470 1.950 127 135 0.411
2006 2 5C 1089 0.480 5.560 202 210 0.123
2007 2 5C 1089 0.491 2.690 123 127 0.457
2008 2 5C 1089 0.502 5.350 219 223 0.097
2009 2 5C 1089 0.512 1.580 100 101 0.646