A community has a population of 15,000 persons. The per capita water consumption

Question

A community has a population of 15,000 persons. The per capita water consumption average is 90 gpcd. The peaking factor for maximum day consumption is 1.4 times average day consumption. The diurnal volume above average is a constant 50.000 gallons. The insurance underwriters indicate that the fire flow requirement is 750 gallons per minute for 45 minutes. What is the required storage volume? If this were to be a concrete tank, why is the usual maximum height not over 35 feet (approximately)? Also, which is cheaper to construct a steel standpipe or a concrete standpipe?

Explanation / Answer

Fire req = 750 x 45 gallons = 33750 gallons 15000 x[1.4x90] = 1890000 gallons diurnal = 50 x 15000 = 750000 Storage capacity = addition of above = 2673750 gallons

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