05533000 DATA: Discharge Tables, 2000

ILLINOIS RIVER BASIN

05533000 FLAG CREEK NEAR WILLOW SPRINGS, IL

LOCATION.-- Lat 41°44'20", long 87°53'47", in SE1/4NE1/4 sec.31, T.38 N., R.12 E., Cook County, Hydrologic Unit 07120004, on left bank at upstream side of bridge on German Church Road, 1.1 mi northwest of Willow Springs, and at mile 2.2.

DRAINAGE AREA.-- 16.5 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: July 1951 to current year.

STAGE: Water years 1994-2000.

REVISED RECORDS.-- WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 606.36 ft above sea level. Prior to June 17, 1963, water-stage recorder at same site at datum 3.73 ft higher. June 17, 1963, to June 26, 1964, nonrecording gage at site 0.5 mi upstream at datum 4.82 ft higher.

REMARKS.-- Effluent from sewage-treatment plant 2 mi upstream.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,680 ft³/s, Sept. 14, 1961, gage height, 13.71 ft, present datum; minimum daily, 0.1 ft³/s, Dec. 9, 1957.

REMARKS FOR CURRENT YEAR.-- Records good. Effluent from sewage-treatment plant, 2 mi. upstream averaged 18.1 ft³/s during the year. The maximum monthly average was 25.1 ft³/s in June, and the minimum was 13.0 ft³/s in November.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	21	13	12	13	13	21	17	30	81	29	31	16
2	18	13	12	14	13	19	17	24	47	27	31	15
3	36	13	16	15	13	18	18	21	34	155	23	14
4	38	13	26	21	14	17	17	20	29	50	23	14
5	22	13	161	16	13	16	17	19	50	36	32	15

6	16	12	56	15	13	17	17	18	32	31	49	15
7	17	12	30	15	13	16	23	17	26	28	44	15
8	17	13	23	14	13	17	35	20	23	25	27	15
9	15	12	20	19	15	17	23	166	22	23	23	14
10	14	13	18	26	19	16	20	94	20	143	21	37

11	14	13	16	20	21	16	22	59	47	59	20	90
12	15	13	15	18	18	15	19	57	123	38	19	213
13	15	12	15	16	16	16	18	56	102	32	19	49
14	14	12	15	15	16	16	18	35	77	28	19	54
15	14	13	19	14	15	18	17	30	61	24	19	33

16	15	12	18	13	16	23	21	32	39	22	19	25
17	14	13	17	14	16	17	63	26	30	23	60	21
18	13	13	16	14	17	16	28	45	26	21	27	21
19	12	13	15	14	18	19	72	52	24	21	19	19
20	13	12	17	14	18	36	349	33	35	20	17	27

21	14	12	16	14	24	23	236	27	33	20	17	23
22	13	12	15	13	55	20	88	26	24	19	17	42
23	13	32	15	13	50	19	62	24	23	18	18	50
24	12	21	14	13	87	22	46	21	70	19	17	42
25	13	14	13	13	50	20	36	18	101	19	16	30

26	13	13	14	13	36	17	31	19	42	18	16	25
27	13	13	14	13	31	23	27	31	31	19	15	22
28	13	12	14	13	25	19	24	178	27	19	16	20
29	13	12	15	13	23	17	22	56	25	19	16	19
30	12	12	14	13	---	17	20	38	23	58	16	18

31	12	---	14	14	---	17	---	88	---	41	16	---

TOTAL	494	406	695	465	691	580	1423	1380	1327	1104	722	1013
MEAN	15.9	13.5	22.4	15.0	23.8	18.7	47.4	44.5	44.2	35.6	23.3	33.8
MAX	38	32	161	26	87	36	349	178	123	155	60	213
MIN	12	12	12	13	13	15	17	17	20	18	15	14

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2000, BY WATER YEAR (WY)
MEAN	14.9	19.1	19.2	18.3	21.6	31.8	35.4	26.4	21.3	17.9	16.9	16.8
MAX	100	69.6	86.6	59.8	98.8	110	95.0	90.9	68.1	67.7	66.8	106
(WY)	1955	1991	1983	1993	1997	1979	1983	1996	1993	1996	1987	1961
MIN	2.30	2.37	2.83	2.44	4.05	5.88	7.00	4.94	5.64	4.94	4.65	3.01
(WY)	1954	1954	1959	1956	1963	1957	1971	1958	1956	1952	1953	1954

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1951 - 2000
ANNUAL TOTAL	12015		10300
ANNUAL MEAN	32.9		28.1		21.6
HIGHEST ANNUAL MEAN					39.6	1983
LOWEST ANNUAL MEAN					7.79	1953
HIGHEST DAILY MEAN	373	Jan 23	349	Apr 20	1040	Jul 18 1996
LOWEST DAILY MEAN	12	A	12	A	.10	Dec 9 1957
ANNUAL SEVEN-DAY MINIMUM	12	Nov 26	12	Nov 26	1.0	Feb 3 1959
INSTANTANEOUS PEAK FLOW			633	Apr 20	2680	Sep 14 1961
INSTANTANEOUS PEAK STAGE			7.29	Apr 20	13.71 B	Sep 14 1961
INSTANTANEOUS LOW FLOW			7.0	Nov 18, Dec. 2
10 PERCENT EXCEEDS	64		50		40
50 PERCENT EXCEEDS	19		19		13
90 PERCENT EXCEEDS	13		13		4.4

A - Several days.
B - Present datum.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	21	13	12	13	13	21	17	30	81	29	31	16
2	18	13	12	14	13	19	17	24	47	27	31	15
3	36	13	16	15	13	18	18	21	34	155	23	14
4	38	13	26	21	14	17	17	20	29	50	23	14
5	22	13	161	16	13	16	17	19	50	36	32	15

6	16	12	56	15	13	17	17	18	32	31	49	15
7	17	12	30	15	13	16	23	17	26	28	44	15
8	17	13	23	14	13	17	35	20	23	25	27	15
9	15	12	20	19	15	17	23	166	22	23	23	14
10	14	13	18	26	19	16	20	94	20	143	21	37

11	14	13	16	20	21	16	22	59	47	59	20	90
12	15	13	15	18	18	15	19	57	123	38	19	213
13	15	12	15	16	16	16	18	56	102	32	19	49
14	14	12	15	15	16	16	18	35	77	28	19	54
15	14	13	19	14	15	18	17	30	61	24	19	33

16	15	12	18	13	16	23	21	32	39	22	19	25
17	14	13	17	14	16	17	63	26	30	23	60	21
18	13	13	16	14	17	16	28	45	26	21	27	21
19	12	13	15	14	18	19	72	52	24	21	19	19
20	13	12	17	14	18	36	349	33	35	20	17	27

21	14	12	16	14	24	23	236	27	33	20	17	23
22	13	12	15	13	55	20	88	26	24	19	17	42
23	13	32	15	13	50	19	62	24	23	18	18	50
24	12	21	14	13	87	22	46	21	70	19	17	42
25	13	14	13	13	50	20	36	18	101	19	16	30

26	13	13	14	13	36	17	31	19	42	18	16	25
27	13	13	14	13	31	23	27	31	31	19	15	22
28	13	12	14	13	25	19	24	178	27	19	16	20
29	13	12	15	13	23	17	22	56	25	19	16	19
30	12	12	14	13	---	17	20	38	23	58	16	18

31	12	---	14	14	---	17	---	88	---	41	16	---

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	21	13	12	13	13	21	17	30	81	29	31	16
2	18	13	12	14	13	19	17	24	47	27	31	15
3	36	13	16	15	13	18	18	21	34	155	23	14
4	38	13	26	21	14	17	17	20	29	50	23	14
5	22	13	161	16	13	16	17	19	50	36	32	15

6	16	12	56	15	13	17	17	18	32	31	49	15
7	17	12	30	15	13	16	23	17	26	28	44	15
8	17	13	23	14	13	17	35	20	23	25	27	15
9	15	12	20	19	15	17	23	166	22	23	23	14
10	14	13	18	26	19	16	20	94	20	143	21	37

11	14	13	16	20	21	16	22	59	47	59	20	90
12	15	13	15	18	18	15	19	57	123	38	19	213
13	15	12	15	16	16	16	18	56	102	32	19	49
14	14	12	15	15	16	16	18	35	77	28	19	54
15	14	13	19	14	15	18	17	30	61	24	19	33

16	15	12	18	13	16	23	21	32	39	22	19	25
17	14	13	17	14	16	17	63	26	30	23	60	21
18	13	13	16	14	17	16	28	45	26	21	27	21
19	12	13	15	14	18	19	72	52	24	21	19	19
20	13	12	17	14	18	36	349	33	35	20	17	27

21	14	12	16	14	24	23	236	27	33	20	17	23
22	13	12	15	13	55	20	88	26	24	19	17	42
23	13	32	15	13	50	19	62	24	23	18	18	50
24	12	21	14	13	87	22	46	21	70	19	17	42
25	13	14	13	13	50	20	36	18	101	19	16	30

26	13	13	14	13	36	17	31	19	42	18	16	25
27	13	13	14	13	31	23	27	31	31	19	15	22
28	13	12	14	13	25	19	24	178	27	19	16	20
29	13	12	15	13	23	17	22	56	25	19	16	19
30	12	12	14	13	---	17	20	38	23	58	16	18

31	12	---	14	14	---	17	---	88	---	41	16	---

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	21	13	12	13	13	21	17	30	81	29	31	16
2	18	13	12	14	13	19	17	24	47	27	31	15
3	36	13	16	15	13	18	18	21	34	155	23	14
4	38	13	26	21	14	17	17	20	29	50	23	14
5	22	13	161	16	13	16	17	19	50	36	32	15

6	16	12	56	15	13	17	17	18	32	31	49	15
7	17	12	30	15	13	16	23	17	26	28	44	15
8	17	13	23	14	13	17	35	20	23	25	27	15
9	15	12	20	19	15	17	23	166	22	23	23	14
10	14	13	18	26	19	16	20	94	20	143	21	37

11	14	13	16	20	21	16	22	59	47	59	20	90
12	15	13	15	18	18	15	19	57	123	38	19	213
13	15	12	15	16	16	16	18	56	102	32	19	49
14	14	12	15	15	16	16	18	35	77	28	19	54
15	14	13	19	14	15	18	17	30	61	24	19	33

16	15	12	18	13	16	23	21	32	39	22	19	25
17	14	13	17	14	16	17	63	26	30	23	60	21
18	13	13	16	14	17	16	28	45	26	21	27	21
19	12	13	15	14	18	19	72	52	24	21	19	19
20	13	12	17	14	18	36	349	33	35	20	17	27

21	14	12	16	14	24	23	236	27	33	20	17	23
22	13	12	15	13	55	20	88	26	24	19	17	42
23	13	32	15	13	50	19	62	24	23	18	18	50
24	12	21	14	13	87	22	46	21	70	19	17	42
25	13	14	13	13	50	20	36	18	101	19	16	30

26	13	13	14	13	36	17	31	19	42	18	16	25
27	13	13	14	13	31	23	27	31	31	19	15	22
28	13	12	14	13	25	19	24	178	27	19	16	20
29	13	12	15	13	23	17	22	56	25	19	16	19
30	12	12	14	13	---	17	20	38	23	58	16	18

31	12	---	14	14	---	17	---	88	---	41	16	---