05533000 DATA: Discharge Tables, 1999

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. Effluent from sewage-treatment plant 2 mi upstream averaged 21.4 ft³/s during the year. The maximum monthly average was 34.7 ft³/s in April, and the minimum was 15.0 ft³/s in September. Gage-height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	20	20	21	15	41	24	19	41	102	43	15	16
2	28	20	18	15	73	26	17	33	227	22	16	15
3	39	19	17	15	57	26	17	30	65	18	15	15
4	21	20	17	16	44	24	22	28	42	16	16	14
5	28	19	16	16	36	24	19	27	31	16	15	14

6	26	18	62	17	33	31	21	33	26	16	15	14
7	21	17	93	16	30	29	19	28	28	15	17	15
8	18	17	39	16	28	28	27	23	23	16	16	15
9	17	18	29	15	28	28	316	21	22	16	15	15
10	15	162	25	15	26	30	91	21	21	14	15	15

11	14	65	25	15	33	30	76	29	30	13	15	14
12	14	39	22	16	32	31	47	182	34	15	22	14
13	13	31	20	15	24	32	37	67	71	15	20	16
14	13	27	19	15	23	30	31	41	57	15	16	15
15	13	24	19	15	22	36	71	32	31	15	15	15

16	13	23	18	16	22	59	240	28	24	14	15	14
17	156	21	18	26	21	80	101	96	21	28	15	16
18	272	20	18	50	20	56	64	57	20	21	15	14
19	82	20	17	29	20	42	47	37	18	19	39	14
20	47	19	16	25	19	35	39	31	17	18	20	15

21	30	18	18	30	18	30	38	71	17	29	17	15
22	25	17	16	314	18	27	118	184	37	37	15	15
23	23	18	16	373	18	25	303	94	23	22	18	14
24	20	17	16	170	17	23	108	64	35	20	34	15
25	19	18	15	99	19	22	78	41	21	17	71	14

26	18	17	15	64	20	21	49	31	19	18	31	14
27	30	15	15	74	39	20	122	27	18	17	22	23
28	29	16	16	73	27	19	200	24	21	16	19	134
29	29	16	16	50	---	19	83	21	22	17	17	74
30	36	27	16	42	---	20	54	19	17	17	17	28

31	24	---	15	38	---	18	---	31	---	16	16	---

TOTAL	1153	798	703	1705	808	945	2474	1492	1140	591	624	641
MEAN	37.2	26.6	22.7	55.0	28.9	30.5	82.5	48.1	38.0	19.1	20.1	21.4
MAX	272	162	93	373	73	80	316	184	227	43	71	134
MIN	13	15	15	15	17	18	17	19	17	13	15	14

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1999, BY WATER YEAR (WY)
MEAN	14.9	19.3	19.2	18.4	21.6	32.1	35.2	26.0	20.8	17.5	16.8	16.5
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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1951 - 1999
ANNUAL TOTAL	12934		13074
ANNUAL MEAN	35.4		35.8		21.5
HIGHEST ANNUAL MEAN					39.6	1983
LOWEST ANNUAL MEAN					7.79	1953
HIGHEST DAILY MEAN	462	May 7	373	Jan 23	1040	Jul 18 1996
LOWEST DAILY MEAN	11	Jul 26, Aug 2	13	A	.10	Dec 9 1957
ANNUAL SEVEN-DAY MINIMUM	12	Jul 28	14	Oct 10	1.0	Feb 3 1959
INSTANTANEOUS PEAK FLOW			860	Apr 9	2680	Sep 14 1961
INSTANTANEOUS PEAK STAGE			8.03	Apr 9	13.71 B	Sep 14 1961
INSTANTANEOUS LOW FLOW			7.8	Nov 28
10 PERCENT EXCEEDS	69		71		40
50 PERCENT EXCEEDS	21		21		13
90 PERCENT EXCEEDS	15		15		4.4

A - Oct 13-16, July 11.
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 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	20	20	21	15	41	24	19	41	102	43	15	16
2	28	20	18	15	73	26	17	33	227	22	16	15
3	39	19	17	15	57	26	17	30	65	18	15	15
4	21	20	17	16	44	24	22	28	42	16	16	14
5	28	19	16	16	36	24	19	27	31	16	15	14

6	26	18	62	17	33	31	21	33	26	16	15	14
7	21	17	93	16	30	29	19	28	28	15	17	15
8	18	17	39	16	28	28	27	23	23	16	16	15
9	17	18	29	15	28	28	316	21	22	16	15	15
10	15	162	25	15	26	30	91	21	21	14	15	15

11	14	65	25	15	33	30	76	29	30	13	15	14
12	14	39	22	16	32	31	47	182	34	15	22	14
13	13	31	20	15	24	32	37	67	71	15	20	16
14	13	27	19	15	23	30	31	41	57	15	16	15
15	13	24	19	15	22	36	71	32	31	15	15	15

16	13	23	18	16	22	59	240	28	24	14	15	14
17	156	21	18	26	21	80	101	96	21	28	15	16
18	272	20	18	50	20	56	64	57	20	21	15	14
19	82	20	17	29	20	42	47	37	18	19	39	14
20	47	19	16	25	19	35	39	31	17	18	20	15

21	30	18	18	30	18	30	38	71	17	29	17	15
22	25	17	16	314	18	27	118	184	37	37	15	15
23	23	18	16	373	18	25	303	94	23	22	18	14
24	20	17	16	170	17	23	108	64	35	20	34	15
25	19	18	15	99	19	22	78	41	21	17	71	14

26	18	17	15	64	20	21	49	31	19	18	31	14
27	30	15	15	74	39	20	122	27	18	17	22	23
28	29	16	16	73	27	19	200	24	21	16	19	134
29	29	16	16	50	---	19	83	21	22	17	17	74
30	36	27	16	42	---	20	54	19	17	17	17	28

31	24	---	15	38	---	18	---	31	---	16	16	---

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	20	20	21	15	41	24	19	41	102	43	15	16
2	28	20	18	15	73	26	17	33	227	22	16	15
3	39	19	17	15	57	26	17	30	65	18	15	15
4	21	20	17	16	44	24	22	28	42	16	16	14
5	28	19	16	16	36	24	19	27	31	16	15	14

6	26	18	62	17	33	31	21	33	26	16	15	14
7	21	17	93	16	30	29	19	28	28	15	17	15
8	18	17	39	16	28	28	27	23	23	16	16	15
9	17	18	29	15	28	28	316	21	22	16	15	15
10	15	162	25	15	26	30	91	21	21	14	15	15

11	14	65	25	15	33	30	76	29	30	13	15	14
12	14	39	22	16	32	31	47	182	34	15	22	14
13	13	31	20	15	24	32	37	67	71	15	20	16
14	13	27	19	15	23	30	31	41	57	15	16	15
15	13	24	19	15	22	36	71	32	31	15	15	15

16	13	23	18	16	22	59	240	28	24	14	15	14
17	156	21	18	26	21	80	101	96	21	28	15	16
18	272	20	18	50	20	56	64	57	20	21	15	14
19	82	20	17	29	20	42	47	37	18	19	39	14
20	47	19	16	25	19	35	39	31	17	18	20	15

21	30	18	18	30	18	30	38	71	17	29	17	15
22	25	17	16	314	18	27	118	184	37	37	15	15
23	23	18	16	373	18	25	303	94	23	22	18	14
24	20	17	16	170	17	23	108	64	35	20	34	15
25	19	18	15	99	19	22	78	41	21	17	71	14

26	18	17	15	64	20	21	49	31	19	18	31	14
27	30	15	15	74	39	20	122	27	18	17	22	23
28	29	16	16	73	27	19	200	24	21	16	19	134
29	29	16	16	50	---	19	83	21	22	17	17	74
30	36	27	16	42	---	20	54	19	17	17	17	28

31	24	---	15	38	---	18	---	31	---	16	16	---

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	20	20	21	15	41	24	19	41	102	43	15	16
2	28	20	18	15	73	26	17	33	227	22	16	15
3	39	19	17	15	57	26	17	30	65	18	15	15
4	21	20	17	16	44	24	22	28	42	16	16	14
5	28	19	16	16	36	24	19	27	31	16	15	14

6	26	18	62	17	33	31	21	33	26	16	15	14
7	21	17	93	16	30	29	19	28	28	15	17	15
8	18	17	39	16	28	28	27	23	23	16	16	15
9	17	18	29	15	28	28	316	21	22	16	15	15
10	15	162	25	15	26	30	91	21	21	14	15	15

11	14	65	25	15	33	30	76	29	30	13	15	14
12	14	39	22	16	32	31	47	182	34	15	22	14
13	13	31	20	15	24	32	37	67	71	15	20	16
14	13	27	19	15	23	30	31	41	57	15	16	15
15	13	24	19	15	22	36	71	32	31	15	15	15

16	13	23	18	16	22	59	240	28	24	14	15	14
17	156	21	18	26	21	80	101	96	21	28	15	16
18	272	20	18	50	20	56	64	57	20	21	15	14
19	82	20	17	29	20	42	47	37	18	19	39	14
20	47	19	16	25	19	35	39	31	17	18	20	15

21	30	18	18	30	18	30	38	71	17	29	17	15
22	25	17	16	314	18	27	118	184	37	37	15	15
23	23	18	16	373	18	25	303	94	23	22	18	14
24	20	17	16	170	17	23	108	64	35	20	34	15
25	19	18	15	99	19	22	78	41	21	17	71	14

26	18	17	15	64	20	21	49	31	19	18	31	14
27	30	15	15	74	39	20	122	27	18	17	22	23
28	29	16	16	73	27	19	200	24	21	16	19	134
29	29	16	16	50	---	19	83	21	22	17	17	74
30	36	27	16	42	---	20	54	19	17	17	17	28

31	24	---	15	38	---	18	---	31	---	16	16	---