RIO GRANDE BASIN

CLOSED BASIN IN SAN LUIS VALLEY, CO

372833105455800 CLOSED BASIN PROJECT CANAL NEAR ALAMOSA, CO

LOCATION.--Lat 37°28'33", long 105°45'58", in SW14SW14 sec.3, T.37 N., R.11 E., Alamosa County, Hydrologic Unit 13010002, on right bank of Closed Basin Project Canal, 400 ft north of State Highway 160, and 5.5 mi east of Alamosa.

DRAINAGE AREA.--Indeterminate.

PERIOD OF RECORD.--October 1998 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=372833105455800

GAGE.--Water-stage recorders with satellite telemetry and 12 ft Parshall flume. Elevation of gage is 7531.15 ft (levels by U.S. Bureau of Reclamation).

REMARKS.--Records good except for estimated daily discharges, which are fair. The Closed Basin Project Canal delivers water from the Closed Basin in the San Luis Valley to the Rio Grande just downstream from Alamosa. Shallow (unconfined) aquifer water is pumped into the canal by a system of pumps.

COOPERATION.--Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.

Discharge, cubic feet per second 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAILY MEAN VALUES

DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP
1	26	13	12	21	30	34	30	24	26	24	21	30
2	25	11	13	26	30	34	29	21	25	22	20	22
3	22	11	14	32	31	34	30	19	27	21	20	10
4	23	10	14	30	30	33	32	19	28	20	20	6.8
5	20	9.9	14	26	30	34	31	20	27	20	20	5.7
6	19	10	14	22	e30	33	31	20	28	20	19	8.3
7	14	10	12	21	30	32	32	19	28	20	20	9.1
8	12	10	13	24	30	32	31	19	29	19	19	8.7
9	11	10	16	25	e30	32	31	17	28	19	20	8.3
10	10	9.8	14	26	e30	32	31	18	28	16	20	7.2
11	11	9.0	11	26	31	32	32	18	27	15	20	6.4
12	11	7.8	8.3	26	31	33	32	17	27	16	20	5.4
13	12	7.3	5.1	27	31	33	29	16	27	17	19	5.0
14	12	7.9	6.1	28	32	34	28	15	27	18	21	5.0
15	12	9.1	6.4	29	33	34	28	15	27	19	28	5.1
16	12	12	6.4	e30	33	33	29	17	26	20	29	5.5
17	13	12	6.4	30	33	34	28	17	26	21	31	5.6
18	13	12	6.8	29	33	35	29	17	25	21	31	6.4
19	13	12	6.9	29	34	36	31	20	25	20	31	13
20	14	12	8.0	28	34	35	30	21	25	21	31	15
21	13	12	8.7	26	34	35	28	23	24	21	32	18
22	13	13	9.9	26	33	35	30	27	24	21	32	16
23	12	12	9.5	26	33	33	30	28	23	20	30	15
24	12	13	9.1	27	32	32	31	27	23	20	25	14
25	16	14	7.9	27	32	32	30	27	25	20	22	15
26	15	14	7.8	27	33	31	27	27	26	20	23	16
27	15	14	9.5	28	33	32	27	27	26	20	26	18
28	14	14	13	29	33	32	26	28	25	20	28	18
29	13	14	13	31	---	31	26	26	24	20	28	19
30	16	12	13	30	---	31	26	26	25	21	28	20
31	14	---	14	30	---	31	---	25	---	20	29	---
TOTAL	458	337.8	322.8	842	889	1,024	885	660	781	612	763	357.5
MEAN	14.8	11.3	10.4	27.2	31.8	33.0	29.5	21.3	26.0	19.7	24.6	11.9
MAX	26	14	16	32	34	36	32	28	29	24	32	30
MIN	10	7.3	5.1	21	30	31	26	15	23	15	19	5.0
AC-FT	908	670	640	1,670	1,760	2,030	1,760	1,310	1,550	1,210	1,510	709
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1999 - 2003, BY WATER YEAR (WY)
MEAN	22.6	22.5	26.1	32.8	32.9	30.6	29.2	26.3	25.2	22.6	20.9	20.9
MAX	35.0	31.6	35.7	42.4	38.1	33.0	34.7	34.3	32.9	35.1	28.1	33.0
(WY)	(2000)	(1999)	(1999)	(1999)	(1999)	(2003)	(1999)	(1999)	(1999)	(1999)	(1999)	(1999)
MIN	11.2	11.3	10.4	27.2	27.7	27.6	24.3	21.3	17.7	15.5	13.0	11.9
(WY)	(2001)	(2003)	(2003)	(2003)	(2002)	(2002)	(2001)	(2003)	(2002)	(2002)	(2000)	(2003)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1999 - 2003
ANNUAL TOTAL	7,421.6	7,932.1
ANNUAL MEAN	20.3	21.7	26.0
HIGHEST ANNUAL MEAN			33.8 1999
LOWEST ANNUAL MEAN			21.7 2003
HIGHEST DAILY MEAN	32 Sep 27	36 Mar 19	e63 Dec 21, 1998
LOWEST DAILY MEAN	5.1 Dec 13	5.0 Sep 13	5.0 Sep 13, 2003
ANNUAL SEVEN-DAY MINIMUM	6.3 Dec 13	5.4 Sep 11	5.4 Sep 11, 2003
MAXIMUM PEAK FLOW		36 Mar 18	101 Dec 21, 1998
MAXIMUM PEAK STAGE		a0.84 Mar 18	b1.70 Dec 21, 1998
ANNUAL RUNOFF (AC-FT)	14,720	15,730	18,840
10 PERCENT EXCEEDS	29	32	35
50 PERCENT EXCEEDS	20	22	27
90 PERCENT EXCEEDS	12	9.9	14

e Estimated. a Maximum gage height, 1.09 ft, Jan 16, backwater from ice. b Maximum gage height, 1.92 ft, Jan 29, 2002, backwater from ice.