PROJ00072

• Contract/PO #: C153592
• Contractor Name: West Divide Water Conservancy District
• Contract Type: Loan
• Water District: 0
• County: Garfield
• Bill Number: SB 89-85
• Loan Projects - Doc Type: Feasibility Study

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5.6 Design:

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Design of the dam has been made in accordance with current instructions

provided by the Office of the State Engineer. Figure 5.1 shows the layout of

the dam with typical cross-sections. The maximum height does not exceed 25

feet, and no habitation exists within at lea!\t 10 miles below the site. It

should therefore be classed as a minor, low-hazard dam.

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Spillway discharge has been determined preliminary using the so-called

rational formula. For a drainage basin of such small size (1,100 acres), this

approach is probably as accurate as any. A 3" thunderstorm and a 40-minute time

of concentration was used. This produced a peak discharge of 1,300 cfs and a

volume of 110 acre-feet. Four feet of surcharge on a 25-acre reservoir area

would store 100 acre-feet. The spillway, as laid out, will discharge 170 cfs at

2-foot depth and 600 cfs at 4-foot depth. More precise calculations will be

made during final design.

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