PROJ00504

• Contract/PO #: C153334
• Contractor Name: Henry Waneka Mutual Reservoir Company c/o City of
• Contract Type: Loan
• Water District: 6
• County: Boulder
• Bill Number: FSA
• Loan Projects - Doc Type: Feasibility Study

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15 - Prepare and print a report according to the requirements of the

CWCB.

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C. Project Area Description

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The Waneka Dam forms a 55 acre reservoir which stores irrigation and

domestic water. The dam and reservoir are located in Section 4, Township

I South, Range 69 West, within the City of Lafayette, Boulder County (see

Figure-I, page 52). The reservoir is an off stream storage facility supplied

by irrigation ditches, diverting water from South Boulder and Coal Creeks. The

natural drainage basin is about 222 acres, extending west approximately I mile

from the dam. The feasibility analysis focuses on the dam area, which is

located on the east and south sides of the reservoir.

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D.

Climate and Topography

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The average annual
normal mean temperature
varied from a maximum of

precipitation at the dam is around 18.5 inches and the

is about 520. Extremes of annual precipitation have

around 29 inches to a minimum of about II inches. The

temperatures in July are about 850 and 590, respec-

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mean maximum and minimum

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dve ly.

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The drainage basin tributary to the reservoir has a west to east aspect

with the high point of the basin at elevation 5325. The current normal maximum

water surface is at elevation 5316. The basin is primarily irrigated crop land

and the soils are sandy clay loam with slopes ranging from I to 5 percent.

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E. Land Use

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The current land use in the upper basin to the west of the reservoir con-

sists primarily of agricultural with some single family residences. The area

is expected to develop into medium density residential. The area immediately

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