LOCATION.-- Lat 38°17'12", long 88°52'19" (NAD of 1927), in NE1/4NE1/4 sec.9, T.3 S., R.3 E., Jefferson County, Hydrologic Unit 07140106, on left bank on upstream side of bridge on State Highway 142, 0.2 mi downstream from Sevenmile Creek, about 2 mi southeast of Mt. Vernon, and at mile 18.8. | |
DRAINAGE AREA.-- 76.9 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1985 to current year. | |
STAGE: Water years 1995-2002. October 1985 to September 1994 (8 AM gage heights). Gage-height record for April 1965 to May 1971 available in files of U.S. Army Corps of Engineers. | |
GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, rain gage, and crest-stage gage. Datum of gage is 420.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). | |
REMARKS.-- Sewage-treatment plant upstream at Mt. Vernon. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 16,100 ft3/s, May 17, 1990, gage height 17.03 ft; minimum daily discharge, 0.15 ft3/s, Sept 29, 1989. | |
EXTREMES OUTSIDE PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Flood of Apr. 4, 1968, reached a stage of 14.60 ft, from records of U.S. Army Corps of Engineers. | |
REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream at Mt. Vernon averaged about 4.9 ft3/s. | |
| DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 3.1 | 7.0 | 93 | e11 | 2150 | 49 | 56 | 49 | 12 | 5.7 | 3.1 | 2.7 |
| 2 | 3.0 | 7.1 | 47 | e10 | 258 | 103 | 49 | 45 | 10 | 4.5 | 3.2 | 2.8 |
| 3 | 3.0 | 6.5 | 32 | e9.5 | 106 | 217 | 57 | 33 | 9.5 | 4.2 | 3.1 | 2.9 |
| 4 | 3.2 | 6.2 | 25 | e9.0 | 69 | 69 | 41 | 27 | 8.4 | 4.4 | 3.0 | 2.7 |
| 5 | 4.5 | 5.7 | 22 | e9.5 | 50 | 54 | 32 | 23 | 8.3 | 3.9 | 3.3 | 2.8 |
| 6 | 3.8 | 5.7 | 101 | e10 | 44 | 51 | 28 | 210 | 8.4 | 3.6 | 3.1 | 3.1 |
| 7 | 3.1 | 5.8 | 93 | e11 | 41 | 41 | 25 | 549 | 7.5 | 3.4 | 3.1 | 3.0 |
| 8 | 2.9 | 5.5 | 48 | 12 | 34 | 38 | 232 | 1670 | 7.0 | 3.4 | 3.1 | 3.0 |
| 9 | 2.8 | 5.5 | 31 | 14 | 30 | 1550 | 139 | 1010 | 6.6 | 3.4 | 3.1 | 2.8 |
| 10 | 3.2 | 5.4 | 23 | 16 | 27 | 1190 | 65 | 177 | 6.8 | 3.3 | 3.0 | 2.8 |
| 11 | e6.0 | 4.9 | 19 | 16 | 24 | 130 | 47 | 85 | 8.1 | 3.1 | 3.0 | 2.7 |
| 12 | e30 | 4.9 | 82 | 14 | 21 | 161 | 209 | 177 | 15 | 15 | 2.7 | 2.7 |
| 13 | 543 | 4.9 | 216 | 14 | 19 | 106 | 575 | 3500 | 45 | 6.0 | 3.8 | 2.8 |
| 14 | 730 | 4.7 | 604 | 14 | 17 | 81 | 1150 | 1910 | 12 | 4.3 | 3.2 | 2.8 |
| 15 | 55 | 4.8 | 230 | 13 | 17 | 84 | 266 | 140 | 7.4 | 4.2 | 3.2 | 2.6 |
| 16 | 133 | 4.8 | 639 | 11 | 16 | 282 | 89 | 82 | 6.1 | 4.0 | 3.1 | 2.7 |
| 17 | 40 | 4.8 | 1960 | 11 | 14 | 125 | 58 | 557 | 5.6 | 4.7 | 3.1 | 5.2 |
| 18 | 20 | 4.7 | 752 | 10 | 14 | 106 | 46 | 130 | 4.8 | 5.4 | 3.0 | 4.4 |
| 19 | 14 | 4.8 | 134 | 12 | 87 | 457 | 41 | 69 | 4.2 | 4.0 | 3.8 | 3.6 |
| 20 | 12 | 4.8 | 76 | 13 | 735 | 1090 | 96 | 50 | 4.5 | 3.5 | 3.1 | 20 |
| 21 | 10 | 4.5 | 57 | 13 | 163 | 200 | 76 | 39 | 4.8 | 3.3 | 2.8 | 6.0 |
| 22 | 7.8 | 4.3 | 48 | 13 | 81 | 87 | 256 | 31 | 4.4 | 3.5 | 2.8 | 3.8 |
| 23 | 7.7 | 4.6 | 49 | 14 | 57 | 66 | 65 | 26 | 4.2 | 3.4 | 3.3 | 3.3 |
| 24 | 83 | 12 | 35 | 47 | 46 | 54 | 69 | 22 | 5.2 | 3.3 | 3.0 | 3.1 |
| 25 | 132 | 10 | 27 | 35 | 40 | 687 | 95 | 21 | 120 | 3.3 | 2.8 | 2.8 |
| 26 | 31 | 8.7 | 23 | 22 | 86 | 501 | 47 | 19 | 333 | 3.3 | 2.8 | 2.8 |
| 27 | 17 | 15 | 22 | 19 | 56 | 158 | 209 | 16 | 46 | 3.4 | 2.8 | 2.8 |
| 28 | 12 | 18 | 22 | 18 | 44 | 93 | 276 | 15 | 22 | 3.3 | 3.0 | 2.5 |
| 29 | 9.5 | 49 | 19 | 17 | --- | 307 | 86 | 15 | 9.1 | 3.2 | 2.9 | 2.5 |
| 30 | 8.4 | 414 | 15 | 29 | --- | 154 | 60 | 15 | 6.3 | 3.5 | 3.0 | 2.5 |
| 31 | 7.9 | --- | e12 | 756 | --- | 76 | --- | 14 | --- | 3.2 | 2.9 | --- |
| TOTAL | 1941.9 | 648.6 | 5556 | 1223.0 | 4346 | 8367 | 4540 | 10726 | 752.2 | 130.7 | 95.2 | 110.2 |
| MEAN | 62.64 | 21.62 | 179.2 | 39.45 | 155.2 | 269.9 | 151.3 | 346.0 | 25.07 | 4.216 | 3.071 | 3.673 |
| MAX | 730 | 414 | 1960 | 756 | 2150 | 1550 | 1150 | 3500 | 333 | 15 | 3.8 | 20 |
| MIN | 2.8 | 4.3 | 12 | 9.0 | 14 | 38 | 25 | 14 | 4.2 | 3.1 | 2.7 | 2.5 |
| CFSM | 0.81 | 0.28 | 2.33 | 0.51 | 2.02 | 3.51 | 1.97 | 4.50 | 0.33 | 0.05 | 0.04 | 0.05 |
| IN. | 0.94 | 0.31 | 2.69 | 0.59 | 2.10 | 4.05 | 2.20 | 5.19 | 0.36 | 0.06 | 0.05 | 0.05 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2002, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 10.69 | 87.14 | 62.60 | 110.5 | 132.3 | 143.1 | 174.1 | 140.1 | 52.26 | 24.75 | 8.077 | 16.04 |
| MAX | 62.6 | 542 | 233 | 327 | 383 | 456 | 540 | 809 | 279 | 101 | 28.6 | 155 |
| (WY) | 2002 | 1994 | 1991 | 1993 | 1986 | 1989 | 1996 | 1995 | 2000 | 1993 | 2000 | 1993 |
| MIN | 2.86 | 3.16 | 4.51 | 4.75 | 10.4 | 24.1 | 40.0 | 4.46 | 2.98 | 2.71 | 1.65 | 2.06 |
| (WY) | 1996 | 2000 | 1990 | 2000 | 1996 | 2001 | 2001 | 1988 | 1991 | 1991 | 1990 | 1995 |
| SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1986 - 2002 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 19644.3 | 38436.8 | ||||
| ANNUAL MEAN | 53.82 | 105.3 | 79.72 | |||
| HIGHEST ANNUAL MEAN | 123 | 1994 | ||||
| LOWEST ANNUAL MEAN | 21.3 | 1987 | ||||
| HIGHEST DAILY MEAN | 1960 | Dec 17 | 3500 | May 13 | 9940 | May 18 1995 |
| LOWEST DAILY MEAN | 2.8 | Oct 9 | 2.5 | Sep 28-30 | 0.15 | Sep 29 1989 |
| ANNUAL SEVEN-DAY MINIMUM | 3.0 | Sep 26 | 2.7 | Sep 24 | 0.38 | Dec 11 1989 |
| MAXIMUM PEAK FLOW | 4230 | May 13 | 16100 | May 17 1990 | ||
| MAXIMUM PEAK STAGE | 13.78 | May 13 | 17.03 | May 17 1990 | ||
| INSTANTANEOUS LOW FLOW | 1.5 | Sep 15 | ||||
| ANNUAL RUNOFF (CFSM) | 0.70 | 1.37 | 1.04 | |||
| ANNUAL RUNOFF (INCHES) | 9.50 | 18.59 | 14.09 | |||
| 10 PERCENT EXCEEDS | 85 | 209 | 116 | |||
| 50 PERCENT EXCEEDS | 11 | 14 | 11 | |||
| 90 PERCENT EXCEEDS | 3.2 | 3.0 | 2.9 | |||
|