Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05540190 ST. JOSEPH CREEK AT BELMONT, 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
1961 1 -- 0 0.891 1.997 583 624 0.061
1962 1 -- 0 0.895 0.288 139 159 0.960
1963 1 -- 0 0.899 1.450 542 577 0.085
1964 1 -- 0 0.903 0.886 123 140 0.975
1965 1 -- 0 0.907 0.843 253 273 0.705
1966 1 -- 0 0.911 1.783 497 524 0.127
1967 1 -- 0 0.915 1.372 314 333 0.503
1968 1 -- 0 0.919 2.065 569 594 0.074
1969 1 -- 0 0.923 1.272 247 262 0.737
1970 1 -- 0 0.927 1.219 330 345 0.467
1971 1 -- 0 0.928 0.868 267 280 0.677
1972 1 -- 0 0.929 2.153 642 664 0.047
1973 1 -- 0 0.930 0.856 448 464 0.186
1974 1 -- 0 0.931 0.983 344 358 0.429
1975 1 -- 0 0.932 1.323 620 640 0.054
1976 1 -- 0 0.933 0.964 216 227 0.838
1977 1 -- 0 0.934 1.121 213 224 0.848