USGS CD-ROM: Current Year Discharge

05439000 SOUTH BRANCH KISHWAUKEE RIVER AT DE KALB, IL

LOCATION.--Lat 41°55'53", long 88°45'35", in SW¼NE¼ sec.22, T.40 N., R.4 E., De Kalb County, Hydrologic Unit 07090006, on left bank 100 ft downstream from bridge on State Highway 38 in De Kalb, and at mile 48.5.

DRAINAGE AREA.--77.7 mi².

PERIOD OF RECORD.--July 1925 to October 1933, October 1979 to current year.

REVISED RECORDS.--WDR IL-80-1: Drainage area.

GAGE.--Water-stage recorder. Datum of gage is 831.88 ft above sea level. Mar. 23, 1980, to Sept. 30, 1983, at datum 3.0 ft higher. Oct. 1, 1979, to Mar. 22, 1980, nonrecording gage at same site at datum 3.0 ft higher. Prior to Sept. 30, 1933, nonrecording gage at same site at datum 3.40 ft higher.

REMARKS.--Records good except those for estimated daily discharges, which are poor. 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	.59	2.1	2.0	.92	30	103	288	e119	52	36	3.6	2.3
2	.37	3.1	1.2	1.8	43	90	226	e129	53	32	3.0	1.6
3	.31	2.3	1.3	39	49	84	183	e120	47	59	2.3	5.2
4	.77	2.2	1.2	e92	55	76	153	e110	45	166	32	2.4
5	.32	3.3	.96	e115	54	67	132	e118	45	91	22	1.6

6	.22	7.8	.86	167	49	64	119	e180	43	67	17	1.1
7	.20	2.6	.60	e230	52	60	119	350	40	164	18	2.6
8	.39	1.2	.47	177	65	151	170	713	38	158	11	1.4
9	1.3	.51	.51	138	63	223	286	498	115	98	7.3	1.2
10	.27	.90	1.0	111	59	179	253	333	248	70	5.4	1.7

11	.16	.43	1.4	113	172	124	190	252	299	54	4.1	.55
12	.11	.36	1.0	79	290	103	160	203	413	45	3.4	.38
13	e5.0	.25	.68	76	199	97	146	173	269	39	2.5	.69
14	2.4	.21	.57	e68	151	86	129	151	200	34	1.6	17
15	1.3	.48	.45	60	127	76	149	138	161	30	1.7	15

16	.88	.89	.46	51	113	73	548	124	131	27	1.8	7.5
17	2.4	.64	.41	45	105	96	394	108	109	22	1.4	4.6
18	.51	.55	.41	e42	97	303	274	103	105	20	1.3	3.4
19	1.2	.52	.38	e36	86	319	214	128	130	34	1.6	2.1
20	1.6	.51	.49	e31	81	234	207	109	103	21	1.6	1.8

21	.37	.57	.47	e28	73	178	364	98	87	18	1.1	1.9
22	.28	.67	.54	e23	69	149	315	92	76	19	1.2	2.1
23	.25	.59	.70	e22	66	128	237	85	69	16	1.4	1.2
24	1.2	e.56	.95	e21	67	111	191	83	65	15	4.7	1.0
25	.62	e.50	2.6	e21	61	104	164	76	58	12	36	.95

26	6.0	.73	1.7	e20	69	99	155	72	51	9.3	6.6	1.5
27	8.8	1.1	1.4	e19	126	91	157	69	47	8.3	3.2	1.6
28	5.7	1.1	1.0	e19	126	93	141	65	54	8.0	17	1.3
29	3.6	3.1	1.0	e18	---	84	133	66	43	6.9	6.7	3.2
30	2.4	3.1	1.1	e18	---	82	121	60	41	5.1	3.8	5.2

31	2.4	---	.97	e19	---	180	---	60	---	4.2	2.8	---

TOTAL	51.92	42.87	28.78	1900.72	2597	3907	6318	4985	3237	1388.8	227.1	94.07
MEAN	1.67	1.43	.93	61.3	92.8	126	211	161	108	44.8	7.33	3.14
MAX	8.8	7.8	2.6	230	290	319	548	713	413	166	36	17
MIN	.11	.21	.38	.92	30	60	119	60	38	4.2	1.1	.38
CFSM	.02	.02	.01	.79	1.19	1.62	2.71	2.07	1.39	.58	.09	.04
IN.	.02	.02	.01	.91	1.24	1.87	3.02	2.39	1.55	.66	.11	.05

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 1998, BY WATER YEAR (WY)
MEAN	24.8	61.9	62.0	43.4	75.1	104	109	93.7	83.0	61.7	39.5	32.0
MAX	119	247	261	154	231	292	309	221	257	322	383	337
(WY)	1927	1986	1983	1993	1997	1993	1993	1995	1993	1983	1987	1980
MIN	.23	1.43	.93	5.25	6.14	12.3	18.6	11.4	9.97	1.52	.51	.33
(WY)	1926	1998	1998	1982	1931	1996	1996	1931	1930	1988	1931	1988

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1926 - 1998
ANNUAL TOTAL	17309.55		24778.26
ANNUAL MEAN	47.4		67.9		65.8
HIGHEST ANNUAL MEAN					151	1993
LOWEST ANNUAL MEAN					13.4	1931
HIGHEST DAILY MEAN	1580	Feb 21	713	May 8	2520	Jul 3 1983
LOWEST DAILY MEAN	.11	Oct 12	.11	Oct 12	.00	A
ANNUAL SEVEN-DAY MINIMUM	.20	Jul 30	.37	Oct 2	.03	Sep 30 1931
INSTANTANEOUS PEAK FLOW			750	May 8	3500	Jul 2 1983
INSTANTANEOUS PEAK STAGE			7.78	May 8	15.80 B	Jul 2 1983
INSTANTANEOUS LOW FLOW			.10	Oct 11,12
ANNUAL RUNOFF (CFSM)	.61		.87		.85
ANNUAL RUNOFF (INCHES)	8.29		11.86		11.50
10 PERCENT EXCEEDS	87		178		161
50 PERCENT EXCEEDS	18		32		28
90 PERCENT EXCEEDS	.30		.57		1.9

A - Aug. 7, Sept. 20, 21, 1988; Aug. 24, 1991.
B - Present datum.