Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05550500 POPLAR CREEK AT ELGIN, IL
| 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 |
| 1952 | 1 | -- | 633 | 0.075 | 0.458 | 303 | 529 | 0.489 |
| 1953 | 1 | E | 633 | 0.084 | 1.075 | 282 | 494 | 0.551 |
| 1954 | 1 | -- | 633 | 0.092 | 1.218 | 310 | 531 | 0.486 |
| 1955 | 1 | -- | 633 | 0.101 | 2.974 | 291 | 499 | 0.542 |
| 1956 | 1 | -- | 633 | 0.109 | 0.728 | 175 | 333 | 0.819 |
| 1957 | 1 | -- | 633 | 0.117 | 2.103 | 286 | 483 | 0.570 |
| 1958 | 1 | -- | 633 | 0.126 | 0.223 | 210 | 376 | 0.755 |
| 1959 | 1 | -- | 633 | 0.134 | 0.402 | 258 | 437 | 0.649 |
| 1960 | 1 | -- | 633 | 0.143 | 0.466 | 340 | 548 | 0.460 |
| 1961 | 1 | -- | 633 | 0.162 | 1.295 | 327 | 520 | 0.505 |
| 1962 | 1 | -- | 633 | 0.180 | 0.272 | 512 | 741 | 0.211 |
| 1963 | 1 | E | 633 | 0.199 | 1.465 | 171 | 297 | 0.868 |
| 1964 | 1 | -- | 633 | 0.218 | 2.432 | 263 | 409 | 0.699 |
| 1965 | 1 | 2 | 633 | 0.237 | 0.091 | 350 | 512 | 0.518 |
| 1966 | 1 | -- | 633 | 0.255 | 0.509 | 476 | 656 | 0.305 |
| 1967 | 1 | -- | 633 | 0.274 | 1.200 | 797 | 1040 | 0.073 |
| 1968 | 1 | -- | 633 | 0.293 | 2.399 | 298 | 420 | 0.679 |
| 1969 | 1 | -- | 1154 | 0.312 | 1.706 | 247 | 351 | 0.791 |
| 1970 | 1 | -- | 1154 | 0.330 | 1.936 | 560 | 708 | 0.244 |
| 1971 | 1 | E | 1154 | 0.344 | 0.374 | 296 | 396 | 0.722 |
| 1972 | 1 | -- | 1154 | 0.358 | 0.653 | 294 | 387 | 0.736 |
| 1973 | 1 | -- | 1266 | 0.372 | 1.465 | 896 | 1070 | 0.067 |
| 1974 | 1 | -- | 1343 | 0.386 | 1.047 | 552 | 666 | 0.292 |
| 1975 | 1 | D | 1343 | 0.400 | 1.118 | 488 | 589 | 0.399 |
| 1976 | 1 | D | 1343 | 0.414 | 1.394 | 490 | 583 | 0.408 |
| 1977 | 1 | E | 1343 | 0.428 | 1.103 | 117 | 157 | 0.976 |
| 1978 | 1 | E | 1343 | 0.442 | 1.649 | 571 | 653 | 0.308 |
| 1979 | 1 | -- | 1343 | 0.456 | 0.292 | 765 | 853 | 0.146 |
| 1980 | 1 | 2E | 1343 | 0.470 | 1.021 | 370 | 421 | 0.680 |
| 1981 | 1 | E | 1343 | 0.477 | 0.566 | 304 | 347 | 0.798 |
| 1982 | 1 | E | 1343 | 0.485 | 0.490 | 537 | 591 | 0.396 |
| 1983 | 1 | -- | 1343 | 0.493 | 1.845 | 761 | 820 | 0.164 |
| 1984 | 1 | -- | 1343 | 0.501 | 0.723 | 394 | 431 | 0.662 |
| 1985 | 1 | -- | 1343 | 0.508 | 1.484 | 633 | 675 | 0.279 |
| 1986 | 1 | -- | 1343 | 0.516 | 0.815 | 719 | 759 | 0.199 |
| 1987 | 1 | -- | 1343 | 0.524 | 1.785 | 625 | 657 | 0.300 |
| 1988 | 1 | -- | 1343 | 0.532 | 1.002 | 441 | 463 | 0.605 |
| 1989 | 1 | -- | 1488 | 0.540 | 1.907 | 700 | 723 | 0.230 |
| 1990 | 1 | -- | 1488 | 0.547 | 1.756 | 669 | 687 | 0.266 |
| 1991 | 1 | -- | 1488 | 0.550 | 1.643 | 399 | 411 | 0.698 |
| 1992 | 1 | E | 1488 | 0.553 | 0.381 | 212 | 220 | 0.942 |
| 1993 | 1 | C | 1488 | 0.555 | 0.906 | 691 | 704 | 0.248 |
| 1994 | 1 | C | 1488 | 0.558 | 0.616 | 779 | 791 | 0.181 |
| 1995 | 1 | C | 1488 | 0.561 | 2.360 | 580 | 588 | 0.400 |
| 1996 | 1 | C | 1488 | 0.564 | 1.762 | 437 | 443 | 0.641 |
| 1997 | 1 | C | 1488 | 0.566 | 2.758 | 1180 | 1190 | 0.046 |
| 1998 | 1 | CE | 1488 | 0.569 | 1.549 | 400 | 403 | 0.712 |
| 1999 | 1 | C | 1488 | 0.572 | 1.863 | 882 | 884 | 0.131 |
| 2000 | 1 | CE | 1488 | 0.574 | 1.365 | 555 | 555 | 0.451 |
| 2001 | 1 | C | 1488 | 0.574 | 0.734 | 600 | 600 | 0.382 |
| 2002 | 1 | C | 1488 | 0.574 | 3.945 | 637 | 637 | 0.328 |
| 2003 | 1 | C | 1488 | 0.574 | 0.955 | 552 | 552 | 0.455 |
| 2004 | 1 | C | 1488 | 0.574 | 1.464 | 367 | 367 | 0.768 |
| 2005 | 1 | CE | 1488 | 0.574 | 0.823 | 407 | 407 | 0.705 |
| 2006 | 1 | C | 1488 | 0.574 | 1.320 | 461 | 461 | 0.608 |
| 2007 | 1 | C | 1488 | 0.574 | 2.888 | 1120 | 1120 | 0.056 |
| 2008 | 1 | C | 1488 | 0.574 | 3.703 | 1560 | 1560 | 0.019 |
| 2009 | 1 | C | 1488 | 0.574 | 0.935 | 1170 | 1170 | 0.048 |