05535500 DATA: Discharge Tables, 2001

Station list Available data
ILLINOIS RIVER BASIN

05535500 WEST FORK OF NORTH BRANCH CHICAGO RIVER AT NORTHBROOK, IL

LOCATION.-- Lat 42°08'18", long 87°50'04", in SW1/4SE1/4 sec.4, T.42 N., R.12 E., Cook County, Hydrologic Unit 07120003, on left bank at upstream side of bridge on State Highway 68 at Northbrook, and at mile 7.9.

DRAINAGE AREA.-- 11.5 mi².

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

DISCHARGE: August 1952 to current year.

STAGE: Water years 1994-2001.

GAGE.-- Water-stage recorder, and phone telemeter. Datum of gage is 637.98 ft above sea level (Cook County Highway Department bench mark).

REMARKS.-- Effluent from sewage-treatment plant 1.7 mi upstream.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,190 ft³/s, Aug. 14, 1987, gage height, 10.10 ft; no flow at times in several years.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. Effluent from sewage - treatment plant averaged about 3.5 ft³/s.

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	3.1	2.0	8.2	6.5	28	20	11	e8.0	28	e3.8	3.8	4.7
2	2.9	3.8	7.0	6.4	21	16	8.4	e7.6	39	e3.7	80	4.1
3	3.5	2.4	6.1	6.5	17	14	7.6	e6.6	28	e3.5	20	5.2
4	47	1.8	5.9	6.4	11	14	7.3	e5.0	19	e3.4	11	5.1
5	16	1.6	5.0	7.0	9.4	13	15	e6.8	28	3.2	7.6	4.2

6	14	13	4.4	7.5	9.0	10	19	e8.1	33	3.4	5.8	22
7	6.4	39	e4.3	7.8	9.5	10	13	e7.8	24	31	4.9	14
8	5.7	11	e4.2	8.1	64	7.5	9.7	e7.0	22	8.7	4.7	6.0
9	4.2	84	e4.1	7.4	207	7.3	17	22	18	5.7	27	13
10	3.4	42	4.2	7.2	83	7.0	12	28	14	4.5	27	9.0

11	3.0	16	e4.5	7.7	32	9.5	26	142	13	3.7	9.6	5.9
12	2.9	11	e5.0	8.2	26	13	41	41	88	3.4	6.2	4.7
13	2.8	19	5.3	11	43	14	19	19	37	3.1	5.4	4.1
14	2.7	11	e5.4	21	58	12	14	19	23	2.8	4.3	3.8
15	2.7	8.2	e5.5	40	44	46	16	32	20	2.7	3.9	3.6

16	3.1	7.9	e5.6	28	17	54	11	34	15	3.1	32	3.6
17	2.7	6.9	e5.7	21	13	45	9.5	28	11	40	9.9	4.9
18	2.5	5.8	5.7	17	9.4	39	8.8	15	10	12	7.8	6.4
19	3.0	5.8	6.3	15	8.3	37	9.2	13	9.7	7.3	50	e337
20	3.2	5.5	6.7	12	9.0	37	20	11	8.0	5.8	18	e74

21	3.2	4.3	6.0	12	12	39	26	10	7.6	4.6	11	87
22	3.0	4.2	e6.2	11	9.3	33	28	9.1	8.1	17	66	27
23	3.6	4.0	e6.0	9.0	10	26	67	8.0	8.0	14	118	65
24	9.5	4.0	5.7	8.5	67	19	34	7.4	e7.5	11	25	36
25	2.9	5.5	e4.8	7.9	101	14	18	7.5	e6.2	13	43	27

26	2.8	14	4.6	9.0	35	11	14	8.0	e5.6	6.4	48	44
27	3.3	8.2	4.8	7.1	25	9.5	12	35	e5.0	5.1	17	36
28	2.4	6.6	4.8	6.5	25	8.5	11	34	e4.7	4.5	12	29
29	2.1	8.0	4.9	37	---	8.4	e10	32	e4.4	4.0	8.3	27
30	2.1	7.5	6.0	88	---	7.9	e9.0	21	e4.0	4.1	12	26

31	2.0	---	6.8	46	---	9.8	---	16	---	4.2	9.1	---

TOTAL	171.7	364.0	169.7	493.7	1002.9	611.4	523.5	648.9	548.8	242.7	708.3	939.3
MEAN	5.54	12.1	5.47	15.9	35.8	19.7	17.5	20.9	18.3	7.83	22.8	31.3
MAX	47	84	8.2	88	207	54	67	142	88	40	118	337
MIN	2.0	1.6	4.1	6.4	8.3	7.0	7.3	5.0	4.0	2.7	3.8	3.6
CFSM	.48	1.06	.48	1.38	3.11	1.72	1.52	1.82	1.59	.68	1.99	2.72
IN.	.56	1.18	.55	1.60	3.24	1.98	1.69	2.10	1.78	.79	2.29	3.04

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 2001, BY WATER YEAR (WY)
MEAN	8.28	11.1	11.9	10.1	14.5	23.0	25.5	16.0	14.4	11.3	10.9	10.4
MAX	23.1	40.4	51.2	40.0	43.2	86.6	57.3	67.3	41.6	59.2	57.5	50.0
(WY)	1987	1986	1983	1974	1997	1979	1983	1996	1978	1982	1987	1986
MIN	.24	.34	.54	.38	1.04	3.01	6.58	4.61	1.51	.50	.47	.24
(WY)	1954	1954	1954	1954	1963	1956	1953	1953	1956	1956	1955	1952

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1952 - 2001
ANNUAL TOTAL	5723.5		6424.9
ANNUAL MEAN	15.6		17.6		14.0
HIGHEST ANNUAL MEAN					22.5	1993
LOWEST ANNUAL MEAN					2.96	1953
HIGHEST DAILY MEAN	217	Apr 20	337 A	Sep 19	753	Aug 14 1987
LOWEST DAILY MEAN	1.0	Jul 23, 24	1.6	Nov 5	.00	B
ANNUAL SEVEN-DAY MINIMUM	1.6	Aug 21	2.2	Oct 30	.00	Oct 27 1956
MAXIMUM PEAK FLOW			624	Sep 19	1190	Aug 14 1987
MAXIMUM PEAK STAGE			7.64	Sep 19	10.10	Aug 14 1987
INSTANTANEOUS LOW FLOW			.72	Nov 5,6
ANNUAL RUNOFF (CFSM)	1.36		1.53		1.21
ANNUAL RUNOFF (INCHES)	18.51		20.78		16.48
10 PERCENT EXCEEDS	39		39		29
50 PERCENT EXCEEDS	5.9		9.0		6.1
90 PERCENT EXCEEDS	2.3		3.6		1.8

	A- Estimated.
	B- At times in several years.