05536995 DATA: Discharge Tables, 2001

ILLINOIS RIVER BASIN

05536995 CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, IL

LOCATION.-- Lat 41°38'27", long 88°03'35", in SE1/4SW1/4 sec.35, T.37 N., R.10 E., Will County, Hydrologic Unit 07120004, on left bank 40 ft upstream from bridge on Romeoville Road in Romeoville, 5.2 mi upstream from Lockport Lock and Dam, and at mile 6.2.

DRAINAGE AREA.-- 739 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1984 to current year.

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1987-92 and 1999 to current.

WATER TEMPERATURE: Water years 1974-77.

REVISED RECORDS.-- WDR IL-86-2: 1985. WDR IL-89-2: 1986. WDR IL-92-2: 1986-89.

GAGE.-- Acoustical flowmeter and phone telemeter. Datum of gage is 551.89 ft above sea level (U.S. Army Corps of Engineers bench mark).

REMARKS.-- Estimated daily discharges determined from a regression relation between present site and the previous site 5.2 mi downstream. This gaging station provides flow data essential to determine Illinois' diversion of Lake Michigan water. A U.S. Supreme Court Decree limits Illinois' diversion to an average of 3,200 ft³/s. Illinois' diversion includes water diverted from the lake for domestic water supply, for navigation and water-quality improvement in the Chicago Sanitary and Ship Canal system, and the stormwater runoff from a 673 mi² diverted watershed area. Flows recorded at this station also include nondiversion flows.

EXTREMES FOR PERIOD RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 19,466 ft³/s, Feb. 21, 1997, gage-height, 23.95 ft; maximum gage-height, 26.43 ft, Feb. 4, 1996, discharge, 2,876 ft³/s; minimum discharge, no flow or periods of reverse flow at times in most years.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are fair.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	1780	1867	1754	1919	3920	2703	1644	1935	4002	2375	2819	3277
2	1915	1663	1773	2176	2761	2492	1788	1937	3379	2179	11087	2699
3	2339	2171	1791	1636	2903	2368	1611	1862	3011	2582	5569	3378
4	5674	1561	2260	1829	2890	2347	1839	1713	2490	2530	3479	2878
5	3450	1755	1427	1329	1806	1892	2160	1707	4354	2301	3505	3033

6	3005	2410	1669	2140	1887	1498	3260	1779	3604	2357	3231	3602
7	3034	2715	1330	1343	2712	2237	3079	2127	3145	3195	2671	3199
8	3533	2437	1594	1578	3793	1794	2328	1729	2662	2545	2717	3102
9	2212	4609	1930	2564	10176	2015	2416	1785	2730	2384	3794	4099
10	2501	3885	1265	1676	7731	1883	2590	2041	2274	2477	3080	3025

11	2318	3178	1284	1192	6152	1963	2308	2761	2936	2352	3628	2686
12	2100	2840	1697	1631	4482	2404	3356	2953	5698	2122	2814	2571
13	2170	3247	2044	2013	3021	1594	1726	2471	3303	2143	2875	2484
14	1983	2150	1716	2595	3735	2237	2167	2763	3500	2013	2351	2493
15	1994	2798	2041	3576	3747	2270	4142	1923	3257	2267	2468	2299

16	1832	2776	1643	3245	2958	3575	2753	2796	2838	2281	3386	2220
17	2013	2041	2162	2908	2761	3986	2131	2472	2596	2338	2719	2423
18	1723	2194	1979	2330	2481	3560	2396	2114	2597	2584	4140	3259
19	1492	1713	1240	1982	2407	3020	1992	1931	2017	2260	4078	e7364
20	2014	1304	1713	2292	1810	3077	3030	1896	2418	2493	2996	e4596

21	1585	1704	2259	2120	2011	2956	4098	2276	2684	2792	3104	e6899
22	1702	1548	1528	1786	1997	2426	4013	2172	2179	4092	2672	e4103
23	1552	1514	1570	1976	1590	2722	3659	2036	2151	5048	3343	e6369
24	2127	1400	1711	1455	5495	2520	2648	2076	2263	4141	4026	e4571
25	1943	1747	1925	2209	6788	1749	2590	2637	2019	6934	8587	e3452

26	1705	2073	1518	1490	5385	2024	2250	3944	1984	4130	4685	e3487
27	1850	2496	1539	1967	3292	1819	1817	6237	1970	3658	3860	e4369
28	1625	1576	1516	1619	3454	1969	2081	3338	2132	3454	3733	e3791
29	1878	1389	1728	2535	---	1685	2032	3050	1956	2812	3253	e4012
30	1944	1776	1944	4672	---	1528	1697	2790	2184	2384	3330	e3712

31	1433	---	1855	3820	---	2302	---	2774	---	2456	7488	---

TOTAL	68426	66537	53405	67603	104145	72615	75601	76025	84333	89679	121488	109452
MEAN	2207	2218	1723	2181	3719	2342	2520	2452	2811	2893	3919	3648
MAX	5674	4609	2260	4672	10176	3986	4142	6237	5698	6934	11087	7364
MIN	1433	1304	1240	1192	1590	1498	1611	1707	1956	2013	2351	2220

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1985 - 2001, BY WATER YEAR (WY)
MEAN	3164	3020	2660	2840	2999	3179	3521	3500	3958	4078	4319	4052
MAX	5244	5244	3991	4347	4975	4791	5194	5491	6405	5426	6830	5181
(WY)	1987	1986	1988	1993	1997	1985	1992	1990	1993	1986	1987	1986
MIN	2018	1511	1723	1612	2069	1734	2520	2370	2811	2893	2917	2681
(WY)	2000	2000	2001	2000	2000	2000	2001	1994	2001	2001	2000	1999

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1985 - 2001
ANNUAL TOTAL	957875		989309
ANNUAL MEAN	2617		2710		3442
HIGHEST ANNUAL MEAN					4113	1986
LOWEST ANNUAL MEAN					2563	2000
HIGHEST DAILY MEAN	11563	Apr 20	11087	Aug 2	17870	May 10 1990
LOWEST DAILY MEAN	1098 A	Mar 12	1192	Jan 11	941 A	Dec 22 1999
ANNUAL SEVEN-DAY MINIMUM	1500	Dec 5	1500	Dec 5	1320	Dec 21 1999
MAXIMUM PEAK FLOW			15479 B	Aug 2	19466 C	Feb 21 1997
MAXIMUM PEAK STAGE			26.06 D	Oct 24	26.43 E	Feb 4 1996
INSTANTANEOUS LOW FLOW			-511	Feb 23	F
10 PERCENT EXCEEDS	4140		4020		5150
50 PERCENT EXCEEDS	2220		2380		3050
90 PERCENT EXCEEDS	1500		1630		2040

	A - Estimated by regression.
	B - Gage height, 21.99 ft.
	C - Gage height, 23.95 ft.
	D - Discharge, 0.0 ft³/s.
	E - Discharge, 2,876 ft³/s.
	F - No flow or periods of reverse flow at times in most years.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data