PROJ00237

• Contract/PO #: C153400
• Contractor Name: Larkspur, Town of
• Contract Type: Loan
• Water District: 8
• County: Douglas
• Bill Number: SB 79-537
• Loan Projects - Doc Type: Feasibility Study

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If the present and future design populations use water at the assumed

rates, the required flows in gpm (gallons per minute) will be:

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Present Future
Demand Popul at ion Population
150 people 225 people
Average day 150 gpcd 16 gpm 23 gpm
Maximum day 300 gpcd 32 gpm 47 gpm
Peak hour 600 gpcd 64 gpm 94 gpm
Annual usage 25 acre feet 38 acre feet
8.2 million gallons 12.3 million gallons

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Fire Flows

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Larkspur is the central location for the Larkspur Fire Protection District.

However, because of the lack of a water supply system, the town has a limited fire

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fighting capability. Fire protection is a major function of a community water

system and, in smaller towns, usually imposes a far greater flow demand than

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normal consumption.

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The Insurance Services Office has established criteria by which a town's

water system is graded to determine fire insurance ratings. The criteria cover

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many aspects of the water system and not many towns can achieve a rating higher

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than seven. (Nine is the lowest category.) In many cases, it is not economically

feasible to construct a water system which would receive a "perfect" rating by

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ISO standards.

However, certain basic criteria should be met. One of these basics is

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the minimum required fire flow of 500 gpm which must be delivered for at least

two hours and which must not reduce pipeline pressure to less than 20 psi (pounds

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per square inch). The minimum fire flow is more than five times greater than the

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normal peak hour consumption and will govern both the pipe line sizes and the

required storage volume.

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