05536358 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05536358 CALUMET RIVER BELOW O'BRIEN LOCK AND DAM AT CHICAGO, IL


LOCATION.-- Lat 41°38'53", long 87°33'50" (NAD of 1927), in SE1/4SE1/4 sec.36, T.37 N., R.14 E., Cook County, Hydrologic Unit 07120003, on right bank, 0.7 mi downstream of 130^th Street in Chicago, and 1100 ft below the downstream lock gates at the Thomas J. O'Brien Lock and Dam, and at mile 6.9.

DRAINAGE AREA.-- Indeterminate.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1996 to cuurent year.

GAGE.-- Water stage recorder, acoustical flowmeter, and phone telemeter. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City datum).

REMARKS.-- This gaging station provides flow data 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 stormwater runoff from a 673 mi² diverted watershed area. Estimated daily discharges determined from regression equations between USGS mean daily discharges and mean daily discharges for the Obrien Lock and Dam as reported by the Metropolitan Water Reclamation District.

EXTREMES FOR PERIOD OF RECORD.-- --Maximum daily discharge, 1069 ft³/s (estimated), June 21,1997; mimimum daily, -769 ft³/s, Feb. 21, 1997, due to regulation to prevent flooding.

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

Discharge, cubic feet per second, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	279	e81	e36	e35	e26	e29	e46	e63	242	308	590	336
2	239	e46	e36	e35	e29	e35	e49	e69	159	374	568	304
3	300	e46	e32	e51	e38	e34	e55	e60	232	291	342	406
4	360	e48	e30	e56	e27	e30	e36	e50	245	335	410	439
5	280	e43	e41	e52	e37	e39	e44	e50	182	320	424	414

6	168	e50	e39	e43	e32	e41	e39	e41	150	321	404	410
7	247	e42	e32	e54	e49	e31	e54	e27	206	362	354	373
8	268	e32	e30	e52	e31	e25	e48	e64	219	310	469	311
9	299	e40	e37	e56	e54	e38	789	e60	260	252	338	290
10	290	229	e34	e61	e34	e25	e48	e62	406	404	344	308

11	314	e29	e35	e58	236	e34	e50	e59	530	391	364	325
12	266	e33	e26	e52	e30	e29	e37	154	298	361	293	284
13	222	e37	e38	e56	e47	e26	e38	220	331	366	316	248
14	237	e46	e26	e46	e38	e34	e36	e58	295	426	404	244
15	262	e56	e31	e34	e31	e27	182	e71	293	380	388	286

16	204	e36	e31	e26	e35	e50	203	e81	283	414	362	315
17	276	e40	e38	e19	e33	e49	e26	340	305	278	340	268
18	395	e45	e32	e31	224	e29	e42	e42	327	432	252	315
19	222	e35	e29	e42	429	e26	e30	e59	333	494	336	252
20	180	e33	e36	e24	e31	e49	e42	e55	306	430	364	240

21	e57	e39	e60	e44	e33	e30	202	e60	292	371	372	268
22	e51	e62	e31	e25	e32	e57	224	e77	201	380	410	264
23	205	e49	e20	e9.0	e37	237	e25	e59	207	294	300	236
24	222	e42	e19	e5.0	e24	160	e39	e33	227	377	328	298
25	276	e35	e21	e11	e35	e48	e51	e43	314	497	300	312

26	248	e41	e30	e20	e35	e44	e37	e53	284	819	418	282
27	212	e37	e23	e36	e30	e37	e41	e65	276	485	351	186
28	236	e52	e29	e24	e31	e30	e17	e76	251	505	416	673
29	185	e55	e31	e35	---	e26	e28	e82	330	560	393	678
30	209	e34	e35	e28	---	e42	e47	e82	295	593	342	282

31	e74	---	e34	e25	---	e29	---	e76	---	794	358	---

TOTAL	7283	1493	1002	1145.0	1748	1420	2605	2391	8279	12924	11650	9847
MEAN	235	49.8	32.3	36.9	62.4	45.8	86.8	77.1	276	417	376	328
MAX	395	229	60	61	429	237	789	340	530	819	590	678
MIN	51	29	19	5.0	24	25	17	27	150	252	252	186

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 1999, BY WATER YEAR (WY)
MEAN	312	63.7	48.4	60.5	56.2	68.2	93.8	122	354	483	456	402
MAX	490	71.8	58.7	79.5	63.8	95.5	107	150	435	559	567	451
(WY)	1997	1997	1997	1997	1998	1997	1998	1997	1997	1998	1998	1998
MIN	210	49.8	32.3	36.9	42.3	45.8	86.8	77.1	276	417	376	328
(WY)	1998	1999	1999	1999	1997	1999	1999	1999	1999	1999	1999	1999

SUMMARY STATISTICS	FOR 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1997 - 1999
ANNUAL TOTAL	81964		61787.0
ANNUAL MEAN	225		169		211
HIGHEST ANNUAL MEAN					238	1997
LOWEST ANNUAL MEAN					169	1999
HIGHEST DAILY MEAN	965	Aug 25	819	Jul 26	1069 A	Jun 21 1997
LOWEST DAILY MEAN	19 A	Dec 24	5.0 A	Jan 24	-769 B	Feb 21 1997
ANNUAL SEVEN-DAY MINIMUM	25 A	Dec 22	19 A	Jan 22	-98 B	Feb 21 1997
10 PERCENT EXCEEDS	577		389		495
50 PERCENT EXCEEDS	125		60		99
90 PERCENT EXCEEDS	35		29		35

	A - Estimated by regression.
	B - Due to regulation to prevent flooding.