05547755 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 42°21'00", long 88°05'18" (NAD of 1927), in SW1/4NE1/4 sec.29, T.45 N., R.10 E., Lake County, Hydrologic Unit 07120006, on left bank at upstream side of bridge on MacGillis Road at Round Lake, and at mile 7.5.

DRAINAGE AREA.-- 17.2 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1989 to current year.
	STAGE: Water years 1994-2002.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 764.94 ft above NGVD of 1929.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 312 ft³/s, July 18, 1993, from rating curve extended above 120 ft³/s on basis of slope-area measurement of peak flow, gage height, 6.42 ft; no flow at times in 1991, 1994 and 1998.

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

DISCHARGE, 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	2.5	35	17	e4.8	e4.8	11	12	5.8	2.6	2.3	0.53	1.5
2	1.8	29	13	e4.7	e4.7	12	14	7.2	2.3	1.9	0.49	6.8
3	1.8	23	11	e4.6	e4.4	14	13	6.6	3.7	1.6	0.49	12
4	1.6	19	10	e4.6	e4.3	17	12	5.5	42	1.5	0.80	7.3
5	3.4	20	9.8	e4.7	e4.3	9.6	10	4.6	63	1.4	0.73	5.1

6	3.0	18	8.4	e4.7	e4.4	9.4	9.6	4.2	68	1.8	0.63	3.8
7	2.5	16	7.4	4.7	4.7	12	11	3.8	157	1.5	0.61	3.1
8	2.2	14	6.8	4.8	5.4	42	28	3.5	87	1.5	0.59	2.6
9	2.1	13	6.1	5.0	7.9	78	74	3.7	43	2.4	0.63	2.3
10	2.4	12	6.8	5.1	20	68	75	3.3	30	1.7	0.63	2.1

11	3.5	11	6.2	4.5	21	55	65	5.7	21	1.5	0.63	2.0
12	17	9.9	5.7	4.1	16	41	45	43	16	1.3	0.65	1.9
13	58	11	12	3.8	13	35	34	42	12	1.1	3.2	2.0
14	132	10	13	4.0	12	29	27	27	11	0.86	2.1	2.1
15	124	9.5	11	3.9	11	22	21	19	9.0	0.78	1.5	2.1

16	85	9.3	10	3.5	9.9	20	17	17	7.9	0.73	1.1	2.0
17	57	7.0	9.6	3.8	9.2	17	12	20	6.5	0.75	0.78	2.0
18	44	7.4	9.1	3.8	13	13	11	16	6.2	0.85	0.69	2.2
19	34	7.8	9.8	3.6	18	14	9.6	12	5.4	1.0	0.95	2.6
20	28	7.2	9.8	3.5	32	15	8.4	11	5.1	0.83	0.71	2.6

21	22	5.8	9.0	3.4	49	16	7.9	8.9	4.3	0.73	1.9	2.5
22	20	5.3	8.5	3.2	40	12	8.1	7.3	3.6	0.69	23	2.5
23	137	5.8	9.2	4.0	30	10	7.3	5.9	3.2	0.66	25	2.3
24	185	7.0	8.2	4.4	23	8.7	6.9	5.2	3.0	0.67	14	2.2
25	174	8.6	e8.0	3.8	18	7.1	6.4	5.3	2.8	0.69	8.4	2.2

26	148	8.2	e7.2	3.7	17	7.4	5.5	5.3	3.3	0.66	5.4	2.1
27	112	7.1	6.6	3.5	15	7.1	5.3	4.7	3.0	0.81	3.9	2.0
28	79	6.2	6.0	3.8	14	7.0	6.9	4.8	2.7	0.73	3.2	2.0
29	56	6.3	5.5	4.1	---	10	6.6	3.9	3.1	0.91	2.6	4.2
30	47	13	5.1	3.8	---	17	5.7	3.5	2.9	0.86	2.2	3.2

31	41	---	e4.9	e4.3	---	15	---	3.1	---	0.70	1.9	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2002, BY WATER YEAR (WY)
MEAN	7.021	12.74	10.88	13.92	24.81	26.16	32.23	26.56	19.10	10.05	2.687	3.445
MAX	52.5	33.6	26.6	40.2	55.4	45.8	79.4	99.6	74.4	54.0	7.60	12.9
(WY)	2002	1993	1992	1999	2001	1990	1993	1996	1996	1993	1990	1992
MIN	0.40	1.16	0.98	3.14	10.9	7.56	9.33	3.36	0.76	0.44	0.19	0.11
(WY)	1995	1997	1990	1994	1995	1996	1994	1994	1992	1991	1991	1994

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1990 - 2002
ANNUAL TOTAL	6229.25		5228.65
ANNUAL MEAN	17.07		14.33		15.72
HIGHEST ANNUAL MEAN					27.6	1993
LOWEST ANNUAL MEAN					9.47	1994
HIGHEST DAILY MEAN	200	Feb 10	185	Oct 24	284	May 21 1996
LOWEST DAILY MEAN	0.39	A	0.49	Aug 2,3	0.00	B
ANNUAL SEVEN-DAY MINIMUM	0.56	Aug 31	0.61	Aug 1	0.00	Sep 10 1994
MAXIMUM PEAK FLOW			236	Jun 7	312 C	Jul 18 1993
MAXIMUM PEAK STAGE			5.64	Jun 7	6.42	Jul 18 1993
INSTANTANEOUS LOW FLOW			0.49	Aug 1-4
ANNUAL RUNOFF (CFSM)	1.00		0.84		0.92
ANNUAL RUNOFF (INCHES)	13.63		11.44		12.56
10 PERCENT EXCEEDS	34		34		39
50 PERCENT EXCEEDS	8.3		6.2		6.6
90 PERCENT EXCEEDS	1.1		1.2		0.65

	A - Aug. 8, Sept. 5.
	B - No flow at times in 1991, 1994 and 1998.
	C - From rating curve extended above 120 ft³/s on basis of slope-area measurement of peak flow.