05539900 DATA: Discharge Tables, 1998

Station list Available data
ILLINOIS RIVER BASIN

05539900 WEST BRANCH DU PAGE RIVER NEAR WEST CHICAGO, IL

LOCATION.--Lat 41°54'39", long 88°10'44", in SE1/4NW1/4 sec.35, T.40 N., R.9 E., Du Page County, Hydrologic Unit 07120004, on left bank at downstream side of bridge on State Highway 64, 2 mi northeast of West Chicago, and at mile 49.2.

DRAINAGE AREA.--28.5 mi².

PERIOD OF RECORD.--July 1961 to current year.

REVISED RECORDS.--WDR IL-75-1: Drainage area. WDR IL-77-1: 1966-67(M).

GAGE.--Water-stage recorder. Datum of gage is 717.76 ft above sea level.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Diurnal fluctuation at low flow caused by sewage-treatment plant upstream from station. Gage-height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	18	19	27	23	58	35	159	47	23	23	16	24
2	18	20	23	28	142	31	119	44	21	20	16	22
3	19	20	25	81	85	30	86	41	16	22	16	22
4	23	19	26	159	66	34	73	40	20	90	46	21
5	23	18	22	161	56	34	55	37	21	36	48	e18

6	22	31	20	152	50	35	48	50	22	28	38	e160
7	21	25	17	195	47	34	47	302	22	62	38	e95
8	19	22	20	112	48	93	213	515	21	49	58	e40
9	24	20	19	118	41	163	177	188	33	32	32	e27
10	22	19	27	83	36	99	108	104	30	27	26	23

11	22	19	34	58	92	77	81	83	101	22	22	21
12	21	21	29	49	109	60	63	69	71	21	20	20
13	51	19	26	41	78	56	56	59	41	20	19	21
14	33	19	23	36	65	56	66	52	31	19	18	24
15	24	24	22	33	50	50	56	49	28	18	18	54

16	20	26	24	31	45	48	115	47	25	18	18	30
17	21	23	23	30	73	72	78	36	22	17	18	26
18	20	21	24	28	73	321	61	34	24	17	17	24
19	20	20	24	27	55	218	53	29	65	36	16	22
20	20	20	21	26	52	139	61	28	31	25	16	22

21	18	23	21	24	48	105	198	26	26	20	16	20
22	17	24	22	23	41	72	124	25	23	19	16	15
23	18	22	22	27	38	58	79	25	22	18	17	15
24	22	21	23	28	41	51	64	44	20	17	27	15
25	24	19	34	24	42	46	56	32	20	16	172	15

26	33	19	32	23	35	45	65	28	47	16	62	16
27	93	22	27	26	40	44	56	25	32	17	38	16
28	38	33	25	28	38	48	46	30	50	16	63	15
29	29	34	24	38	---	45	50	31	33	17	44	15
30	23	36	24	44	---	41	49	26	27	16	33	21

31	20	---	22	42	---	127	---	25	---	17	27	---

TOTAL	796	678	752	1798	1644	2367	2562	2171	968	791	1031	879
MEAN	25.7	22.6	24.3	58.0	58.7	76.4	85.4	70.0	32.3	25.5	33.3	29.3
MAX	93	36	34	195	142	321	213	515	101	90	172	160
MIN	17	18	17	23	35	30	46	25	16	16	16	15
CFSM	.90	.79	.85	2.04	2.06	2.68	3.00	2.46	1.13	.90	1.17	1.03
IN.	1.04	.88	.98	2.35	2.15	3.09	3.34	2.83	1.26	1.03	1.35	1.15

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1998, BY WATER YEAR (WY)
MEAN	23.2	32.9	34.5	29.5	38.1	54.3	60.7	44.7	37.3	26.5	29.3	27.1
MAX	68.0	111	134	77.8	118	191	135	113	103	63.8	135	115
(WY)	1987	1986	1983	1993	1997	1979	1983	1996	1996	1993	1987	1972
MIN	1.54	1.62	.97	.87	.75	12.3	14.7	13.9	2.02	5.36	1.50	1.22
(WY)	1964	1963	1963	1963	1963	1968	1963	1971	1963	1966	1961	1962

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1961 - 1998
ANNUAL TOTAL	14758		16437
ANNUAL MEAN	40.4		45.0		36.5
HIGHEST ANNUAL MEAN					58.1	1993
LOWEST ANNUAL MEAN					6.41	1963
HIGHEST DAILY MEAN	630	Feb 22	515	May 8	817	Dec 3 1982
LOWEST DAILY MEAN	13	Jul 30, Aug 1	15	Sep 22-25,28,29	.20	Jul 5 1963
ANNUAL SEVEN-DAY MINIMUM	14	Jul 27	15	Sep 22	.26	Jul 5 1963
INSTANTANEOUS PEAK FLOW			623	May 8	984 A	Dec 3 1982
INSTANTANEOUS PEAK STAGE			9.03	May 8	10.78	Feb 21 1997
INSTANTANEOUS LOW FLOW			9.3	Oct 10	.20	B
ANNUAL RUNOFF (CFSM)	1.42		1.58		1.28
ANNUAL RUNOFF (INCHES)	19.26		21.45		17.39
10 PERCENT EXCEEDS	61		85		75
50 PERCENT EXCEEDS	26		28		23
90 PERCENT EXCEEDS	18		18		7.1

A - Gage height, 10.44 ft.
B - July 1, 5, 8-12, 1963.