05536995 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN

05536995 CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, IL


LOCATION.-- Lat 41°38'27", long 88°03'35" (NAD of 1927), 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 (135th Street) 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 1994-2002.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1987-92 and 1999 to 2001.
	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 NGVD of 1929 (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; 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 COMPUTED FLOW, 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	e2971	e2746	e3081	e1576	e3325	e1856	1934	3150	2417	2464	2887	2953
2	e2656	e2508	e2621	e1642	e1823	e3098	3258	1839	2246	2472	3055	4019
3	e2607	e2917	e1644	e1746	e2684	e3074	2893	2730	3250	2555	3074	2990
4	e3928	e2397	e2206	e1724	e2313	e2536	2451	2423	7564	2640	3719	2983
5	e6603	e2202	e2100	e1576	e1963	e2404	2261	2492	3645	2815	3009	2717

6	e3584	e2290	e1822	e2062	e2058	e2642	2141	2415	3439	2486	3272	2740
7	e3860	e1965	e2040	e1613	e2130	e3272	3447	2468	3077	2369	2889	2589
8	e2759	e2386	e2186	e1650	e2149	e5527	4839	3682	3112	2387	2802	2643
9	e2697	e1787	e1544	e1538	e2798	e7861	5906	4475	3195	4543	2803	2256
10	e2601	e1773	e1977	e1605	e3374	e5505	5598	4038	4677	3160	2841	2344

11	e2884	e2085	e1805	e1573	e2883	e4084	3572	7811	4268	2815	2667	2258
12	e5061	e1681	e2219	e1410	e2873	e3098	3355	14486	3193	2794	e3271	1892
13	e9490	e2051	e1926	e2054	e2630	e1853	3511	9388	2922	2802	e4571	2106
14	e15238	e2975	e2753	e1800	e2380	e2714	2720	6515	3693	2747	e3511	2248
15	e7334	e2424	e2502	e1614	e2204	e2808	2702	4502	3410	2684	e3955	1716

16	e6338	e2325	e2123	e1706	e2473	e3230	e2655	5731	3428	2206	e3280	2013
17	e4091	e1870	e2798	e1656	e1849	e2483	2591	4430	2456	2542	e3424	2236
18	e3418	e1964	e2169	e1854	e1656	e3249	2275	3597	2517	2100	e3282	2523
19	e3297	e1985	e2218	e1449	e2602	e2836	2280	3825	2378	2744	e3348	2986
20	e3168	e915	e2323	e1831	e3873	e3101	4712	2807	2315	2612	e3355	2824

21	e3192	e1313	e2178	e1601	e3276	e2996	4137	2863	2299	2605	e3107	2742
22	e4424	e1350	e1692	e1889	e3325	e2839	3412	2345	2419	2366	12316	2785
23	e2985	e1350	e2311	e1324	e3131	e3019	3046	2648	2590	2706	6662	2173
24	e5314	e1862	e1796	e1692	e2468	e2904	2991	3186	2191	2681	4768	1806
25	e6486	e1912	e2030	e1750	e1954	e2066	3158	3706	3046	2530	3761	1844

26	e5493	e1053	e1359	e1350	e2371	e2377	2537	1926	2957	2521	3657	1958
27	e3178	e1755	e2109	e1632	e2451	e2053	4165	2240	2594	2821	3665	1919
28	e3744	e2244	e1763	e1650	e2050	e1943	4123	1847	2164	2858	3346	1994
29	e3362	e2398	e1754	e1809	---	e1804	3464	1946	2414	2630	3339	2191
30	e3600	e3174	e1497	e1822	---	e1866	2704	2061	2683	3144	3064	2152

31	e3174	---	e1790	e1816	---	e2572	---	2075	---	2866	3306	---

TOTAL	139537	61657	64336	52014	71066	93670	98838	119647	92559	83665	116006	72600
MEAN	4501	2055	2075	1678	2538	3022	3295	3860	3085	2699	3742	2420
MAX	15238	3174	3081	2062	3873	7861	5906	14486	7564	4543	12316	4019
MIN	2601	915	1359	1324	1656	1804	1934	1839	2164	2100	2667	1716

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1985 - 2002, BY WATER YEAR (WY)
MEAN	3238	2966	2628	2775	2974	3170	3509	3520	3910	4002	4287	3961
MAX	5244	5243	3991	4347	4975	4789	5194	5493	6405	5426	6830	5182
(WY)	1987	1986	1988	1993	1997	1985	1992	1990	1993	1986	1987	1986
MIN	2018	1511	1723	1612	2069	1734	2520	2370	2811	2699	2917	2420
(WY)	2000	2000	2001	2000	2000	2000	2001	1994	2001	2002	2000	2002

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1985 - 2002
ANNUAL TOTAL	1066471		1065595
ANNUAL MEAN	2922		2919		3413
HIGHEST ANNUAL MEAN					4113	1986
LOWEST ANNUAL MEAN					2563	2000
HIGHEST DAILY MEAN	15238 A	Oct 14	15238 A	Oct 14	17870	May 10 1990
LOWEST DAILY MEAN	915 A	Nov 20	915 A	Nov 20	915 A	Nov 20 2001
ANNUAL SEVEN-DAY MINIMUM	1390	Nov 20	1390	Nov 20	1320	Dec 21 1999
MAXIMUM PEAK FLOW			17984 B	Aug 22	19466 C	Feb 21 1997
MAXIMUM PEAK STAGE			26.21	Jul 24	26.43 E	Feb 4 1996
INSTANTANEOUS LOW FLOW			0.00	F		G
10 PERCENT EXCEEDS	4140		4100		5110
50 PERCENT EXCEEDS	2530		2630		3020
90 PERCENT EXCEEDS	1760		1750		2010

	A - Estimated by regression.
	B - Measured; gage height, 21.37 ft., may have been greater during periods of missing record during Oct. or Aug. 22.
	C - Gage height, 23.95 ft.
	D - Discharge, 2,184 ft³/s.
	E - Discharge, 2,876 ft³/s.
	F - Many days.
	G - No flow or periods of reverse flow at times in most years.