Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05550300 TYLER CREEK AT ELGIN, 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
1962 1 -- 0 0.068 0.264 303 424 0.656
1963 1 -- 0 0.072 1.416 74 129 0.977
1965 1 -- 0 0.078 0.711 368 500 0.535
1966 1 -- 0 0.081 0.938 392 528 0.490
1967 1 -- 0 0.084 2.936 333 454 0.613
1968 1 -- 0 0.088 3.327 251 353 0.765
1969 1 -- 0 0.091 0.109 318 432 0.644
1970 1 -- 0 0.094 2.145 306 417 0.668
1971 1 -- 0 0.098 0.346 358 478 0.574
1972 1 -- 0 0.102 1.391 454 592 0.401
1973 1 -- 0 0.106 2.136 488 629 0.357
1974 1 -- 0 0.110 1.133 311 415 0.670
1975 1 -- 0 0.114 1.523 261 355 0.764
1976 1 -- 0 0.118 1.635 324 427 0.652
1978 1 -- 0 0.126 2.389 398 511 0.517
1979 1 -- 0 0.130 1.601 432 550 0.460
1980 1 -- 0 0.134 0.374 208 283 0.855
1998 1 CE 65 0.204 0.627 221 273 0.869
1999 1 C 65 0.208 1.087 953 1080 0.076
2000 1 C 65 0.211 1.024 735 834 0.174
2001 1 C 65 0.225 0.670 602 681 0.296
2002 1 C 65 0.239 1.990 1650 1790 0.016
2003 1 C 65 0.252 0.917 778 850 0.166
2004 1 C 65 0.266 1.501 795 858 0.163
2005 1 CE 477 0.280 0.768 432 468 0.591
2006 1 C 477 0.293 0.299 595 630 0.354
2007 1 C 477 0.307 2.199 1430 1480 0.028
2008 1 C 477 0.321 3.782 1250 1280 0.045
2009 1 C 477 0.335 0.699 886 897 0.143