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Californians use an average of 102 gallons of water per person per day. Given 32 inches of precipitation across a region this wet season. What percent of a four person household’s annual water needs could be met from collecting precipitation from an 840 square foot metal rooftop where 90% of the precipitation is retained? Assume it is not leap year and a gallon equals 0.134 cubic feet. Show your work.

Answer :

the total amount of precipitation that can be collected from the 840-square-foot metal rooftop. So, collecting precipitation from the 840-square-foot metal rooftop with a 90% retention rate could meet 10.8% of a four-person household's annual water needs in California.

First, we need to calculate the total amount of precipitation that can be collected from the 840-square-foot metal rooftop.

32 inches of precipitation across the region is equivalent to 32/12 = 2.67 feet of precipitation.

So, the total volume of precipitation that can be collected from the rooftop is:

2.67 feet x 840 square feet x 0.9 (90% retention rate) = 2,152.8 cubic feet

Since 1 gallon is equal to 0.134 cubic feet, the total amount of water collected in gallons is:

2,152.8 cubic feet / 0.134 cubic feet per gallon = 16,074.6 gallons

For a four-person household, the annual water needs would be:

102 gallons per person per day x 4 people x 365 days = 148,680 gallons

Therefore, the percentage of the household's annual water needs that could be met by collecting precipitation from the rooftop is:

(16,074.6 gallons / 148,680 gallons) x 100% = 10.8%

So, collecting precipitation from the 840-square-foot metal rooftop with a 90% retention rate could meet 10.8% of a four-person household's annual water needs in California.

Learn more about precipitation at brainly.com/question/18109776

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