In the United States, water used for irrigation is measured in acre-feet. An acre-foot of water covers an acre to a depth of exactly 1 ft. An acre is 4840 yd2. An acre-foot is enough water to supply two typical households for 1.00 yr. (a) If desalinated water costs $1950 per acre-foot, how much does desalinated water cost per liter? (b) How much would it cost one household per day if it were the only source of water?
Solution 70AE: (A)Here, we have to calculate the water cost per litre. We know 1 acre ft = 1233.48 m = 1.233 x 10 L 9 Therefore, Total cost $1950 -6 The cost per litre is = total water 1.233 x 109L $1581.5 x 10 -6 Thus, the desalinated water cost per liter is $1581.5 x 10 (B) Here we have to calculate the cost of water for per day for each household Given in Question, Two household spend 1 acre ft water for 1 year and the cost of water between them is $1950 Thus, The cost of water per household is = 1920 = $975 In one year (365 days), each household spends $975 for water The cost of water for each household in per day = $975 = $2.67/day 365 day Thus, the cost of water for each household per day is =$2.67