05439500 DATA: Discharge Tables, 2003

Station list Available data
ROCK RIVER BASIN


LOCATION.-- Lat 42°06'38", long 88°54'02" (NAD of 1927), in SE1/4SE1/4 sec.17, T.42 N., R.3 E., De Kalb County, Hydrologic Unit 07090006, on right bank at downstream side of bridge on Irene Road, 1.2 mi downstream from Owens Creek, 1.8 mi northeast of Fairdale, and at mile 11.0.

DRAINAGE AREA.-- 387 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1939 to current year. Monthly discharge only for some periods, published in WSP 1308.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-81.
	MISCELLANEOUS: Water years 1998 and 2002.

REVISED RECORDS.-- WSP 1508: 1940, 1942(M). WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 733.90 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to May 1, 1940, nonrecording gage at same site and datum. Prior to Nov. 7, 1986, water-stage recorder on left bank at upstream side of bridge at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 25,400 ft³/s, July 18, 1996, gage height 13.37 ft; minimum discharge, 2.1 ft³/s, Jan. 20, 1940.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: A stage of 11.9 ft occurred in March 1937, from information by a local resident.

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

Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	34	35	24	e25	e25	e26	52	358	190	48	185	18
2	39	40	31	e24	e27	e26	45	826	154	45	140	19
3	55	35	30	e24	e30	e25	45	518	141	42	109	24
4	59	36	31	e24	e30	e23	53	338	135	40	131	20
5	99	49	31	e24	e24	e22	77	619	118	44	91	18

6	75	41	31	e24	e26	e25	103	853	109	51	71	16
7	55	39	33	e25	e25	e25	94	547	107	46	58	15
8	50	38	32	e26	e23	e25	85	398	124	61	51	14
9	42	37	29	e26	e23	e30	77	592	144	104	48	13
10	40	38	32	e27	e24	e30	69	1090	130	116	42	14

11	39	39	33	e27	e24	e27	69	1060	116	100	38	14
12	39	40	32	e27	e25	e31	68	1570	107	82	36	17
13	39	38	33	e28	e25	e40	60	1690	101	70	34	22
14	37	37	33	e27	e25	e60	56	973	94	62	31	33
15	37	39	33	e26	e24	126	55	845	89	174	29	24

16	36	36	33	e25	e23	105	54	593	81	250	27	21
17	36	36	34	e24	e23	90	52	454	73	167	25	18
18	36	35	39	e23	e23	79	49	366	69	109	23	16
19	36	39	64	e23	e25	70	49	312	80	79	24	15
20	38	39	72	e23	e26	64	50	353	82	66	22	13

21	35	37	51	e21	e28	70	53	365	81	95	21	12
22	34	34	38	e22	e28	59	47	296	71	75	21	16
23	36	34	29	e22	e28	52	44	257	64	62	19	18
24	33	34	e27	e21	e27	49	41	230	62	52	23	22
25	41	34	e26	e21	e25	53	37	207	56	43	20	17

26	45	34	e26	e21	e25	54	36	185	61	36	23	16
27	46	33	e25	e22	e25	52	37	166	71	34	22	17
28	39	31	e25	e22	e26	51	37	159	58	30	18	25
29	37	35	e26	e21	---	57	38	172	54	30	17	21
30	35	32	e26	e21	---	59	46	168	55	29	19	17

31	37	---	e26	e22	---	52	---	166	---	31	17	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2003, BY WATER YEAR (WY)
MEAN	158	189	200	225	331	517	493	415	390	227	162	141
MAX	1318	1052	1234	946	1244	2392	1782	1316	1734	1863	1202	1181
(WY)	1955	1986	1983	1974	2001	1979	1993	1996	1993	1996	1987	1980
MIN	11.3	12.6	11.3	6.19	15.5	50.2	55.9	47.8	57.4	20.5	17.9	12.3
(WY)	1954	1954	1964	1940	1940	2003	2003	1949	1988	1940	1971	1953

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1940 - 2003
ANNUAL TOTAL	106579		32019
ANNUAL MEAN	292		87.7		287
HIGHEST ANNUAL MEAN					752	1993
LOWEST ANNUAL MEAN					65.7	1977
HIGHEST DAILY MEAN	7040	Jun 4	1690	May 13	14600	Jul 18 1996
LOWEST DAILY MEAN	24	Dec 1	12	Sep 21	3.0	Jan 20 1940
ANNUAL SEVEN-DAY MINIMUM	26	Dec 25	15	Sep 6	4.1	Jan 19 1940
MAXIMUM PEAK FLOW			1820	May 13	25400	Jul 18 1996
MAXIMUM PEAK STAGE			5.81	May 13	13.37	Jul 18 1996
INSTANTANEOUS LOW FLOW			5.0	Sep 9	2.1	Jan 20 1940
ANNUAL RUNOFF (CFSM)	0.75		0.23		0.74
ANNUAL RUNOFF (INCHES)	10.24		3.08		10.07
10 PERCENT EXCEEDS	548		156		665
50 PERCENT EXCEEDS	113		37		130
90 PERCENT EXCEEDS	34		21		20