Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05535150 SKOKIE RIVER AT NORTHFIELD, 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
1960 1 -- 0 0.471 0.436 387 565 0.377
1961 1 -- 0 0.485 1.255 320 473 0.549
1962 1 -- 0 0.499 0.233 374 536 0.431
1963 1 -- 0 0.513 1.262 267 396 0.711
1964 1 -- 0 0.527 0.793 279 405 0.694
1965 1 -- 0 0.540 0.525 285 406 0.691
1966 1 -- 0 0.554 1.148 312 432 0.634
1967 1 2 0 0.568 1.394 567 720 0.178
1968 1 -- 0 0.582 0.766 309 416 0.668
1969 1 -- 0 0.596 1.938 450 574 0.361
1970 0 -- 961 0.610 1.733 420 535 0.434
1971 2 -- 961 0.615 0.349 404 515 0.470
1972 2 -- 961 0.620 2.127 459 574 0.360
1973 2 -- 961 0.625 0.710 385 487 0.522
1974 2 -- 961 0.630 1.230 438 546 0.413
1975 2 -- 961 0.635 0.986 399 498 0.501
1976 2 -- 961 0.640 1.511 499 606 0.300
1978 2 -- 961 0.650 1.524 303 383 0.738
1979 2 -- 961 0.655 1.181 414 505 0.488