05533000 DATA: Discharge Tables, 1998

ILLINOIS RIVER BASIN

05533000 FLAG CREEK NEAR WILLOW SPRINGS, IL

LOCATION.--Lat 41°44'20", long 87°53'48", 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.--July 1951 to current year.

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

GAGE.--Water-stage recorder 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.--Records good except those for Oct. 1 - 26, which are fair. Effluent from sewage-treatment plant 2 mi upstream averaged 20.1 ft³/s during the year. The maximum monthly average was 27,1 ft³/s in March, and the minimum was 13.9 ft³/s in October. Gage-height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	15	11	19	15	36	20	91	37	17	16	12	16
2	14	11	17	20	61	20	75	31	16	13	11	16
3	13	11	19	38	39	21	47	27	18	25	12	16
4	17	13	18	83	32	24	36	29	17	80	258	21
5	14	11	15	103	27	22	31	29	17	25	146	15

6	11	18	15	92	24	21	30	33	17	20	65	14
7	15	13	14	66	23	20	38	462	16	32	65	382
8	12	12	14	94	21	84	101	286	16	21	47	71
9	16	11	14	90	21	134	80	98	82	19	30	38
10	14	13	25	51	23	82	52	55	44	16	31	26

11	14	12	27	34	92	56	39	36	158	14	26	22
12	13	11	22	30	69	43	34	32	84	14	20	19
13	24	11	19	25	42	38	43	41	32	14	18	18
14	17	12	16	26	32	37	54	28	22	13	17	24
15	15	16	17	22	28	32	34	25	19	14	16	58

16	15	16	17	21	34	33	39	24	17	13	15	26
17	13	13	17	19	64	100	32	20	16	13	17	21
18	13	13	15	18	70	260	28	20	18	12	16	20
19	14	12	15	18	44	121	26	19	31	21	15	19
20	14	12	14	17	36	72	41	19	16	15	15	17

21	14	13	15	17	29	49	60	19	14	15	16	17
22	14	14	17	17	26	38	40	17	14	15	15	16
23	14	12	18	18	25	35	33	16	14	14	15	16
24	15	12	20	17	26	31	29	42	14	13	27	16
25	15	12	37	19	23	29	28	22	15	12	26	16

26	31	11	27	17	22	27	49	19	115	11	19	16
27	52	28	21	18	23	25	41	18	30	13	17	15
28	16	39	18	19	21	33	27	26	28	12	30	15
29	15	28	18	25	---	25	49	21	21	12	20	16
30	12	22	18	24	---	25	38	18	19	12	17	28

31	11	---	16	24	---	72	---	19	---	12	16	---

TOTAL	502	443	574	1097	1013	1629	1345	1588	957	551	1070	1030
MEAN	16.2	14.8	18.5	35.4	36.2	52.5	44.8	51.2	31.9	17.8	34.5	34.3
MAX	52	39	37	103	92	260	101	462	158	80	258	382
MIN	11	11	14	15	21	20	26	16	14	11	11	14

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1998, BY WATER YEAR (WY)
MEAN	14.4	19.1	19.1	17.6	21.4	32.1	34.1	25.5	20.5	17.4	16.7	16.3
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 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1951 - 1998
ANNUAL TOTAL	10840		11799
ANNUAL MEAN	29.7		32.3		21.2
HIGHEST ANNUAL MEAN					39.6	1983
LOWEST ANNUAL MEAN					7.79	1953
HIGHEST DAILY MEAN	920	Feb 21	462	May 7	1040	Jul 18 1996
LOWEST DAILY MEAN	11	A	11	A	.10	Dec 9 1957
ANNUAL SEVEN-DAY MINIMUM	11	Oct 30	11	Oct 30	1.0	Feb 3 1959
INSTANTANEOUS PEAK FLOW			1160	Sep 7	2680	Sep 14 1961
INSTANTANEOUS PEAK STAGE			8.71	Sep 7	13.71 B	Sep 14 1961
INSTANTANEOUS LOW FLOW			3.1	Oct 6
10 PERCENT EXCEEDS	47		62		40
50 PERCENT EXCEEDS	19		20		12
90 PERCENT EXCEEDS	13		13		4.3

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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	15	11	19	15	36	20	91	37	17	16	12	16
2	14	11	17	20	61	20	75	31	16	13	11	16
3	13	11	19	38	39	21	47	27	18	25	12	16
4	17	13	18	83	32	24	36	29	17	80	258	21
5	14	11	15	103	27	22	31	29	17	25	146	15

6	11	18	15	92	24	21	30	33	17	20	65	14
7	15	13	14	66	23	20	38	462	16	32	65	382
8	12	12	14	94	21	84	101	286	16	21	47	71
9	16	11	14	90	21	134	80	98	82	19	30	38
10	14	13	25	51	23	82	52	55	44	16	31	26

11	14	12	27	34	92	56	39	36	158	14	26	22
12	13	11	22	30	69	43	34	32	84	14	20	19
13	24	11	19	25	42	38	43	41	32	14	18	18
14	17	12	16	26	32	37	54	28	22	13	17	24
15	15	16	17	22	28	32	34	25	19	14	16	58

16	15	16	17	21	34	33	39	24	17	13	15	26
17	13	13	17	19	64	100	32	20	16	13	17	21
18	13	13	15	18	70	260	28	20	18	12	16	20
19	14	12	15	18	44	121	26	19	31	21	15	19
20	14	12	14	17	36	72	41	19	16	15	15	17

21	14	13	15	17	29	49	60	19	14	15	16	17
22	14	14	17	17	26	38	40	17	14	15	15	16
23	14	12	18	18	25	35	33	16	14	14	15	16
24	15	12	20	17	26	31	29	42	14	13	27	16
25	15	12	37	19	23	29	28	22	15	12	26	16

26	31	11	27	17	22	27	49	19	115	11	19	16
27	52	28	21	18	23	25	41	18	30	13	17	15
28	16	39	18	19	21	33	27	26	28	12	30	15
29	15	28	18	25	---	25	49	21	21	12	20	16
30	12	22	18	24	---	25	38	18	19	12	17	28

31	11	---	16	24	---	72	---	19	---	12	16	---

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	15	11	19	15	36	20	91	37	17	16	12	16
2	14	11	17	20	61	20	75	31	16	13	11	16
3	13	11	19	38	39	21	47	27	18	25	12	16
4	17	13	18	83	32	24	36	29	17	80	258	21
5	14	11	15	103	27	22	31	29	17	25	146	15

6	11	18	15	92	24	21	30	33	17	20	65	14
7	15	13	14	66	23	20	38	462	16	32	65	382
8	12	12	14	94	21	84	101	286	16	21	47	71
9	16	11	14	90	21	134	80	98	82	19	30	38
10	14	13	25	51	23	82	52	55	44	16	31	26

11	14	12	27	34	92	56	39	36	158	14	26	22
12	13	11	22	30	69	43	34	32	84	14	20	19
13	24	11	19	25	42	38	43	41	32	14	18	18
14	17	12	16	26	32	37	54	28	22	13	17	24
15	15	16	17	22	28	32	34	25	19	14	16	58

16	15	16	17	21	34	33	39	24	17	13	15	26
17	13	13	17	19	64	100	32	20	16	13	17	21
18	13	13	15	18	70	260	28	20	18	12	16	20
19	14	12	15	18	44	121	26	19	31	21	15	19
20	14	12	14	17	36	72	41	19	16	15	15	17

21	14	13	15	17	29	49	60	19	14	15	16	17
22	14	14	17	17	26	38	40	17	14	15	15	16
23	14	12	18	18	25	35	33	16	14	14	15	16
24	15	12	20	17	26	31	29	42	14	13	27	16
25	15	12	37	19	23	29	28	22	15	12	26	16

26	31	11	27	17	22	27	49	19	115	11	19	16
27	52	28	21	18	23	25	41	18	30	13	17	15
28	16	39	18	19	21	33	27	26	28	12	30	15
29	15	28	18	25	---	25	49	21	21	12	20	16
30	12	22	18	24	---	25	38	18	19	12	17	28

31	11	---	16	24	---	72	---	19	---	12	16	---

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	15	11	19	15	36	20	91	37	17	16	12	16
2	14	11	17	20	61	20	75	31	16	13	11	16
3	13	11	19	38	39	21	47	27	18	25	12	16
4	17	13	18	83	32	24	36	29	17	80	258	21
5	14	11	15	103	27	22	31	29	17	25	146	15

6	11	18	15	92	24	21	30	33	17	20	65	14
7	15	13	14	66	23	20	38	462	16	32	65	382
8	12	12	14	94	21	84	101	286	16	21	47	71
9	16	11	14	90	21	134	80	98	82	19	30	38
10	14	13	25	51	23	82	52	55	44	16	31	26

11	14	12	27	34	92	56	39	36	158	14	26	22
12	13	11	22	30	69	43	34	32	84	14	20	19
13	24	11	19	25	42	38	43	41	32	14	18	18
14	17	12	16	26	32	37	54	28	22	13	17	24
15	15	16	17	22	28	32	34	25	19	14	16	58

16	15	16	17	21	34	33	39	24	17	13	15	26
17	13	13	17	19	64	100	32	20	16	13	17	21
18	13	13	15	18	70	260	28	20	18	12	16	20
19	14	12	15	18	44	121	26	19	31	21	15	19
20	14	12	14	17	36	72	41	19	16	15	15	17

21	14	13	15	17	29	49	60	19	14	15	16	17
22	14	14	17	17	26	38	40	17	14	15	15	16
23	14	12	18	18	25	35	33	16	14	14	15	16
24	15	12	20	17	26	31	29	42	14	13	27	16
25	15	12	37	19	23	29	28	22	15	12	26	16

26	31	11	27	17	22	27	49	19	115	11	19	16
27	52	28	21	18	23	25	41	18	30	13	17	15
28	16	39	18	19	21	33	27	26	28	12	30	15
29	15	28	18	25	---	25	49	21	21	12	20	16
30	12	22	18	24	---	25	38	18	19	12	17	28

31	11	---	16	24	---	72	---	19	---	12	16	---