Answer:
Total 17 high rate filters are required
Explanation:
Given -
Rate of filtration of slow sand filters = 10 million gallons/acre-day
Total million gallons of water filtered per day = 10 million gallons/acre-day * 15 acres
= 150 Million gallons per day
Rate of filtration of high rate filters = 6 gpm/ft2
Area of one high rate filter = 1,000 ft2
Volume of water filtered by 1 high rate filter is 6 gpm/ft2 *1,000 ft2 = 6000 gallons per minute = 8640000 gallon per day
Number of filters required = 150 million gallons per day /8640000 gallon per day
150 * 10^6/8640000
17
Total 17 high rate filters are required