PROJ00505

• Contract/PO #: C153419
• Contractor Name: San Miguel Water Conservancy District
• Water District: 0
• County: San Miguel
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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potential consumptive use in the project service area. An ideal demand of 3.25

acre-feet per acre per year was estimated by combining Bureau of Reclamation

estimates for conveyance and application losses with consumptive use, reuse,

and application days estimates.

TABLE 4.2 - Ideal demand for lands to be served by water from the Cone
Reservoir Enlargement

Application
Days

Gurley
Service Area

Cone
Service Area

Total

May
June
July
August
September
October

15
30
31
31
30
10

2060 AF
8239 AF
8239 AF
8239 AF
4119 AF
824 AF
31,720AF

204 AF
815 AF
815 AF
815 AF
407 AF
81 AF
3,237 AF

2264 AF
9054 AF
9054 AF
9054 AF
4526 AF
905 AF
34.857 AF

4.3 Surface Water Supply

The Cone Reservoir is currently supplied by two collection ditohes which

intercept several small drainages on the northwest slope of Lone Cone Peak, as

shown on Figure 4-1. The ditch capacity is approximately 100 cfs at the lower

end. The maximum recorded diversion for the 10-year study period (1974-1983)

was 100 ds in 1975.
period.

Annual inflow averaged 3672 acre-feet for the same

Records indicate that the Cone Reservoir filled in 7 of the 10 years.

although the total water supply was inadequate to fully meet irrigation demands

in most years. Water shortages occur primarily during the months of August,

September and October.

Stream gage records for streams in the District are limited. The USGS, in

cooperation with the Bureau of Reclamation. installed several gages in 1974 and

1975.

These were removed in 1980. Water supply for this study had to be

estimated using Bureau of Reclamation data and gage data to the extent

possible. The period of record for stream gages in the Project area is listed

in Table 4.3 (a).

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