05448000 DATA: Discharge Tables, 2002

Station list Available data
ROCK RIVER BASIN


LOCATION.-- Lat 41°26'32", long 90°33'21" (NAD of 1927), in NW1/4NE1/4 sec.25, T.17 N., R.2 W., Rock Island County, Hydrologic Unit 07090005, on right bank at upstream side of Knoxville Road Bridge, 1 mi southeast of Milan, and at mile 1.2.

DRAINAGE AREA.-- 62.4 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: March 1989 to current year. October 1939 to September 1940 (fragmentary), July 1941 to September 1986. Seven-month period (March to September), water years 1987-89.
	STAGE: Water years 1999-2002.

REVISED RECORDS.-- WSP 1308: 1940(M), 1943(M). WDR IL-72-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 565.23 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1987, at datum 1.00 ft higher. Prior to Apr. 5, 1940, nonrecording gage at site 300 ft upstream. Oct. 1939 to Nov. 15, 1984, recording gage at site 400 ft. upstream.

REMARKS.-- Occasional pumpage of about 1 ft³/s from quarry into creek upstream from gage.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 9,300 ft³/s, Apr. 22, 1973, gage height, 12.65 ft, present datum; no flow at times in several years.

REMARKS FOR CURRENT YEAR.-- Records good except those for Feb. 22 to Aug. 8, which are fair, and those for estimated daily disharges, 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	4.3	17	16	e15	26	e29	42	73	58	33	24	18
2	3.9	14	14	e14	16	e25	67	74	58	32	20	17
3	5.2	12	15	e14	19	e30	75	62	56	30	18	14
4	6.8	12	16	e14	e17	e50	59	56	363	28	19	13
5	34	12	17	e15	14	e46	56	53	243	26	89	12

6	13	12	19	16	12	44	52	54	149	32	49	11
7	7.7	12	15	20	13	51	92	50	114	34	30	10
8	7.2	12	14	18	13	184	344	48	93	28	25	9.6
9	7.0	12	13	19	16	308	448	58	80	29	22	11
10	9.6	11	13	20	29	171	214	46	75	26	18	10

11	14	10	13	16	30	130	161	304	189	88	17	9.5
12	9.4	9.7	14	16	31	108	130	807	123	58	17	9.5
13	8.9	10	21	e15	35	92	109	289	244	38	37	7.5
14	12	16	19	e14	33	81	95	210	159	32	20	7.3
15	10	13	16	e13	29	74	89	161	119	29	16	7.2

16	9.9	11	15	e13	28	63	79	166	98	26	16	7.7
17	8.2	10	16	e12	26	61	71	147	86	26	14	7.4
18	6.5	9.9	15	e12	25	57	66	122	77	25	12	6.3
19	6.5	12	15	e12	33	53	61	107	68	48	30	6.3
20	6.4	13	14	e12	81	51	57	99	64	36	20	6.6

21	6.3	11	14	13	84	46	66	88	59	26	14	6.7
22	11	9.6	19	14	58	43	60	80	54	22	21	6.1
23	93	9.4	31	17	51	46	53	84	51	21	227	5.0
24	43	25	28	16	46	43	57	78	46	20	93	6.3
25	39	25	e24	13	42	41	59	126	46	19	52	7.1

26	26	18	e22	16	38	40	50	96	58	18	39	4.9
27	21	21	e20	15	34	38	83	82	51	38	32	4.3
28	18	17	e19	15	e36	39	131	77	42	33	27	4.4
29	16	15	e18	14	---	48	88	73	38	98	23	4.3
30	16	16	e17	11	---	46	77	67	35	48	21	3.8

31	17	---	e16	16	---	40	---	62	---	32	19	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2002, BY WATER YEAR (WY)
MEAN	22.70	23.99	26.53	38.04	64.10	76.88	79.72	75.22	70.48	41.43	24.88	18.82
MAX	209	175	162	223	261	299	335	432	616	388	259	208
(WY)	1955	1962	1983	1960	2001	1960	1965	1996	1993	1986	1993	1970
MIN	0.11	0.51	0.44	0.000	2.78	3.95	3.17	3.44	1.86	1.50	0.89	0.18
(WY)	1957	1957	1977	1940	1964	1956	1956	1956	1956	1988	1957	1956

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1940 - 2002
ANNUAL TOTAL	28449.1		17395.2
ANNUAL MEAN	77.94		47.66		48.27
HIGHEST ANNUAL MEAN					173	1993
LOWEST ANNUAL MEAN					8.67	1957
HIGHEST DAILY MEAN	1650	Feb 9	807	May 12	5000	Jul 8 1986
LOWEST DAILY MEAN	2.7	Sep 16,17	3.8	Sep 30	0.00	A
ANNUAL SEVEN-DAY MINIMUM	3.8	Aug 29	5.0	Sep 24	0.00	Dec 30 1939
MAXIMUM PEAK FLOW			1520	May 12	9300	Apr 22 1973
MAXIMUM PEAK STAGE			5.98	May 12	12.65 B	Apr 22 1973
INSTANTANEOUS LOW FLOW			2.1	Oct 2
ANNUAL RUNOFF (CFSM)	1.25		0.76		0.77
ANNUAL RUNOFF (INCHES)	16.96		10.37		10.51
10 PERCENT EXCEEDS	184		95		96
50 PERCENT EXCEEDS	24		26		18
90 PERCENT EXCEEDS	6.5		9.6		1.8

	A - At times in several years.
	B - Present datum.

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	4.3	17	16	e15	26	e29	42	73	58	33	24	18
2	3.9	14	14	e14	16	e25	67	74	58	32	20	17
3	5.2	12	15	e14	19	e30	75	62	56	30	18	14
4	6.8	12	16	e14	e17	e50	59	56	363	28	19	13
5	34	12	17	e15	14	e46	56	53	243	26	89	12

6	13	12	19	16	12	44	52	54	149	32	49	11
7	7.7	12	15	20	13	51	92	50	114	34	30	10
8	7.2	12	14	18	13	184	344	48	93	28	25	9.6
9	7.0	12	13	19	16	308	448	58	80	29	22	11
10	9.6	11	13	20	29	171	214	46	75	26	18	10

11	14	10	13	16	30	130	161	304	189	88	17	9.5
12	9.4	9.7	14	16	31	108	130	807	123	58	17	9.5
13	8.9	10	21	e15	35	92	109	289	244	38	37	7.5
14	12	16	19	e14	33	81	95	210	159	32	20	7.3
15	10	13	16	e13	29	74	89	161	119	29	16	7.2

16	9.9	11	15	e13	28	63	79	166	98	26	16	7.7
17	8.2	10	16	e12	26	61	71	147	86	26	14	7.4
18	6.5	9.9	15	e12	25	57	66	122	77	25	12	6.3
19	6.5	12	15	e12	33	53	61	107	68	48	30	6.3
20	6.4	13	14	e12	81	51	57	99	64	36	20	6.6

21	6.3	11	14	13	84	46	66	88	59	26	14	6.7
22	11	9.6	19	14	58	43	60	80	54	22	21	6.1
23	93	9.4	31	17	51	46	53	84	51	21	227	5.0
24	43	25	28	16	46	43	57	78	46	20	93	6.3
25	39	25	e24	13	42	41	59	126	46	19	52	7.1

26	26	18	e22	16	38	40	50	96	58	18	39	4.9
27	21	21	e20	15	34	38	83	82	51	38	32	4.3
28	18	17	e19	15	e36	39	131	77	42	33	27	4.4
29	16	15	e18	14	---	48	88	73	38	98	23	4.3
30	16	16	e17	11	---	46	77	67	35	48	21	3.8

31	17	---	e16	16	---	40	---	62	---	32	19	---

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	4.3	17	16	e15	26	e29	42	73	58	33	24	18
2	3.9	14	14	e14	16	e25	67	74	58	32	20	17
3	5.2	12	15	e14	19	e30	75	62	56	30	18	14
4	6.8	12	16	e14	e17	e50	59	56	363	28	19	13
5	34	12	17	e15	14	e46	56	53	243	26	89	12

6	13	12	19	16	12	44	52	54	149	32	49	11
7	7.7	12	15	20	13	51	92	50	114	34	30	10
8	7.2	12	14	18	13	184	344	48	93	28	25	9.6
9	7.0	12	13	19	16	308	448	58	80	29	22	11
10	9.6	11	13	20	29	171	214	46	75	26	18	10

11	14	10	13	16	30	130	161	304	189	88	17	9.5
12	9.4	9.7	14	16	31	108	130	807	123	58	17	9.5
13	8.9	10	21	e15	35	92	109	289	244	38	37	7.5
14	12	16	19	e14	33	81	95	210	159	32	20	7.3
15	10	13	16	e13	29	74	89	161	119	29	16	7.2

16	9.9	11	15	e13	28	63	79	166	98	26	16	7.7
17	8.2	10	16	e12	26	61	71	147	86	26	14	7.4
18	6.5	9.9	15	e12	25	57	66	122	77	25	12	6.3
19	6.5	12	15	e12	33	53	61	107	68	48	30	6.3
20	6.4	13	14	e12	81	51	57	99	64	36	20	6.6

21	6.3	11	14	13	84	46	66	88	59	26	14	6.7
22	11	9.6	19	14	58	43	60	80	54	22	21	6.1
23	93	9.4	31	17	51	46	53	84	51	21	227	5.0
24	43	25	28	16	46	43	57	78	46	20	93	6.3
25	39	25	e24	13	42	41	59	126	46	19	52	7.1

26	26	18	e22	16	38	40	50	96	58	18	39	4.9
27	21	21	e20	15	34	38	83	82	51	38	32	4.3
28	18	17	e19	15	e36	39	131	77	42	33	27	4.4
29	16	15	e18	14	---	48	88	73	38	98	23	4.3
30	16	16	e17	11	---	46	77	67	35	48	21	3.8

31	17	---	e16	16	---	40	---	62	---	32	19	---

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	4.3	17	16	e15	26	e29	42	73	58	33	24	18
2	3.9	14	14	e14	16	e25	67	74	58	32	20	17
3	5.2	12	15	e14	19	e30	75	62	56	30	18	14
4	6.8	12	16	e14	e17	e50	59	56	363	28	19	13
5	34	12	17	e15	14	e46	56	53	243	26	89	12

6	13	12	19	16	12	44	52	54	149	32	49	11
7	7.7	12	15	20	13	51	92	50	114	34	30	10
8	7.2	12	14	18	13	184	344	48	93	28	25	9.6
9	7.0	12	13	19	16	308	448	58	80	29	22	11
10	9.6	11	13	20	29	171	214	46	75	26	18	10

11	14	10	13	16	30	130	161	304	189	88	17	9.5
12	9.4	9.7	14	16	31	108	130	807	123	58	17	9.5
13	8.9	10	21	e15	35	92	109	289	244	38	37	7.5
14	12	16	19	e14	33	81	95	210	159	32	20	7.3
15	10	13	16	e13	29	74	89	161	119	29	16	7.2

16	9.9	11	15	e13	28	63	79	166	98	26	16	7.7
17	8.2	10	16	e12	26	61	71	147	86	26	14	7.4
18	6.5	9.9	15	e12	25	57	66	122	77	25	12	6.3
19	6.5	12	15	e12	33	53	61	107	68	48	30	6.3
20	6.4	13	14	e12	81	51	57	99	64	36	20	6.6

21	6.3	11	14	13	84	46	66	88	59	26	14	6.7
22	11	9.6	19	14	58	43	60	80	54	22	21	6.1
23	93	9.4	31	17	51	46	53	84	51	21	227	5.0
24	43	25	28	16	46	43	57	78	46	20	93	6.3
25	39	25	e24	13	42	41	59	126	46	19	52	7.1

26	26	18	e22	16	38	40	50	96	58	18	39	4.9
27	21	21	e20	15	34	38	83	82	51	38	32	4.3
28	18	17	e19	15	e36	39	131	77	42	33	27	4.4
29	16	15	e18	14	---	48	88	73	38	98	23	4.3
30	16	16	e17	11	---	46	77	67	35	48	21	3.8

31	17	---	e16	16	---	40	---	62	---	32	19	---