05580000 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 40°15'17", long 89°07'45" (NAD of 1927), on line between secs.19 and 20, T.21 N., R.1 E., De Witt County, Hydrologic Unit 07130009, on left upstream side of bridge on Waynesville Road, 0.5 mi downstream from Rock Creek, 0.7 mi north of Waynesville, and at mile 25.3.

DRAINAGE AREA.-- 227 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: January 1948 to current year.
	STAGE: Water years 1994-2002.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WSP 1175: 1948-49.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 620.24 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark). Prior to Sept. 8, 1970, nonrecording gage at same site and datum.

REMARKS.-- Diurnal fluctuation of low flows caused by City of Heyworth pumping station 10 mi. upstream at highway 136.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 24,600 ft³/s, Aug. 15, 1981, gage height, 16.91 ft; no flow Sept. 15, 28, 29, 1988.

REMARKS FOR CURRENT YEAR.-- Records fair 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	2.2	45	187	e54	416	213	278	510	194	90	28	84
2	2.1	42	131	e50	388	299	268	443	182	83	22	73
3	2.0	45	98	e52	414	336	222	354	173	79	18	66
4	2.5	34	83	e54	356	362	192	298	167	73	16	60
5	4.7	28	73	e55	302	352	182	263	189	67	14	48

6	19	27	65	e52	273	391	173	256	179	62	12	38
7	9.7	26	56	e46	243	540	173	247	164	56	14	34
8	5.5	25	50	e47	212	509	238	229	154	53	14	30
9	4.2	23	44	e48	196	792	455	381	147	50	15	27
10	4.1	22	39	48	196	550	354	347	154	46	13	24

11	4.1	19	41	43	193	541	316	802	212	44	11	23
12	30	17	43	40	197	532	282	3000	311	41	11	21
13	48	16	57	41	172	480	247	2840	400	38	12	19
14	142	16	70	43	159	427	233	1050	724	33	19	18
15	76	16	66	40	162	378	223	715	371	30	22	19

16	100	16	96	36	148	315	201	599	278	26	1770	25
17	105	18	251	34	133	295	184	674	234	23	1090	21
18	67	19	340	e33	123	278	175	733	208	21	305	23
19	46	18	261	e32	224	256	172	551	192	20	332	30
20	35	18	199	e33	840	251	159	452	180	19	331	29

21	27	19	161	e34	457	224	312	390	167	17	222	39
22	33	18	147	e36	398	201	441	342	156	19	162	27
23	61	17	158	38	371	205	332	315	141	28	1630	25
24	71	24	139	37	329	198	304	354	138	23	1410	30
25	154	40	116	33	290	192	351	298	134	21	513	18

26	147	26	e110	30	271	180	289	263	130	19	350	15
27	97	21	e100	29	245	186	916	246	124	32	263	15
28	71	20	e90	29	225	259	2170	235	113	52	201	15
29	57	20	e82	31	---	289	919	230	101	76	160	14
30	51	72	e72	51	---	388	641	226	94	74	133	14

31	49	---	e62	409	---	314	---	212	---	40	108	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 2002, BY WATER YEAR (WY)
MEAN	54.81	85.51	151.8	160.5	219.6	289.5	330.6	273.3	233.5	121.7	77.09	57.42
MAX	523	877	954	1020	731	1294	1020	976	1100	713	1540	1028
(WY)	1978	1986	1991	1993	1959	1979	1973	1995	1974	1993	1981	1993
MIN	0.31	2.07	0.79	3.69	3.76	19.1	47.7	32.1	9.69	2.40	1.33	0.70
(WY)	1964	1964	1964	1977	1963	2000	1956	1963	1963	1988	1963	1988

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1948 - 2002
ANNUAL TOTAL	48340.2		72953.1
ANNUAL MEAN	132.4		199.9		171.7
HIGHEST ANNUAL MEAN					518	1993
LOWEST ANNUAL MEAN					38.5	1954
HIGHEST DAILY MEAN	2250	Feb 25	3000	May 12	16100	Aug 15 1981
LOWEST DAILY MEAN	1.4	Aug 15	2.0	Oct 3	0.00	A
ANNUAL SEVEN-DAY MINIMUM	1.7	Aug 11	6.0	Oct 1	0.20	Oct 21 1963
MAXIMUM PEAK FLOW			3840	May 12	24600	Aug 15 1981
MAXIMUM PEAK STAGE			13.41	May 12	16.91	Aug 15 1981
INSTANTANEOUS LOW FLOW			1.5	Oct 4
ANNUAL RUNOFF (CFSM)	0.58		0.88		0.76
ANNUAL RUNOFF (INCHES)	7.92		11.96		10.28
10 PERCENT EXCEEDS	322		411		399
50 PERCENT EXCEEDS	62		100		62
90 PERCENT EXCEEDS	4.0		18		4.8

A - Sept. 15, 28, 29, 1988.