Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05549000 BOONE CREEK NEAR MC HENRY, 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
1949 1 -- 0 0.001 0.314 246 386 0.107
1950 1 -- 0 0.001 1.413 190 304 0.218
1951 1 E 0 0.001 2.075 118 205 0.527
1952 1 -- 0 0.001 0.502 186 298 0.231
1953 1 E 0 0.002 0.651 52 108 0.888
1954 1 E 0 0.002 1.417 167 273 0.297
1955 1 -- 0 0.002 0.323 187 299 0.228
1956 1 E 0 0.003 0.414 59 118 0.858
1957 1 E 0 0.003 0.778 90 164 0.696
1958 1 E 0 0.003 0.756 34 79 0.948
1959 1 E 0 0.004 0.433 137 233 0.422
1960 1 -- 0 0.004 0.544 149 249 0.368
1961 1 E 0 0.006 0.979 64 125 0.836
1962 1 E 0 0.008 0.274 88 160 0.711
1963 1 3E 0 0.010 1.284 228 357 0.141
1964 1 E 0 0.012 1.563 81 150 0.754
1965 0 2 400 0.014 0.119 175 276 0.289
1966 2 D 400 0.016 0.510 178 274 0.293
1967 2 E 400 0.017 1.297 112 186 0.611
1968 2 E 400 0.019 1.289 45 92 0.926
1969 2 2 400 0.021 1.362 80 141 0.781
1970 2 -- 400 0.023 1.558 276 404 0.092
1971 2 E 400 0.027 0.429 220 325 0.181
1972 2 -- 400 0.031 1.043 223 328 0.177
1973 2 -- 400 0.035 1.556 162 251 0.364
1974 2 -- 400 0.039 1.137 252 366 0.130
1975 2 -- 400 0.043 0.848 106 173 0.658
1976 2 -- 400 0.047 1.462 258 372 0.123
1977 2 E 400 0.051 0.866 42 84 0.939
1978 2 -- 400 0.055 1.524 209 303 0.218
1979 2 -- 400 0.059 0.295 145 223 0.456
1980 2 E 400 0.062 0.884 61 110 0.884
1981 2 E 400 0.066 1.462 91 150 0.754
1982 2 -- 400 0.070 0.291 196 284 0.267
1983 2 -- 400 0.074 1.614 190 276 0.289
1984 2 -- 400 0.078 0.626 128 196 0.566
1985 2 -- 400 0.082 0.531 116 179 0.633
1986 2 -- 400 0.085 1.468 345 472 0.057
1987 2 -- 400 0.089 0.679 113 174 0.653
1988 2 -- 400 0.093 0.913 115 176 0.646
1989 2 4B 400 0.097 0.119 95 150 0.752
1990 2 -- 400 0.101 0.432 56 98 0.912
1991 2 -- 400 0.113 0.881 162 234 0.420
1992 2 -- 400 0.125 0.967 50 87 0.934