One acre-foot is about 325,851 US gallons.
325,900 gallons.
A 1000 acre lake that is 7 feet deep (uniformly) will have 7000 acre feet of water in it. An acre foot is an acre of water one foot deep, and the unit is used to measure reservoir water capacity. The conversion factor is that one acre foot equals about 325,851.5 gallons. The lake in question is holding 7000 times 325,851.5 gallons of water.
1 acre-foot is 325,851.43 US gallons.
1 acre-foot = (325,851/number of gallons in each barrel) barrels
1 acre-foot equates to 43,560 cubic feet. In terms of gallons of water, this is the same as about 325,851.43 US gallons.
1 acre = 43560 sq.feet. 1 foot deep water over an acre is 43560 cubic feet, which is 325851.4 gallons in 1 foot deep. If it is 1 inch deep (1/12 foot) then it is 27154.3 gallons in 1 inch deep.
I'm assuming you mean acre feet of water. If that is the case, then there are 325,850.58 gallons in one acre foot of water or 4,887,758.7 gallons of water in 15 acre feet of water.
7.48 gallons
Multiply acre-ft by 325,900 to get gallons. So your answer would be about 138 billion gallons, more precisely 1.379 x 1011 gallons. We know that 1 acre foot = 325 851.427 US gallons. We need to find the number of gallons of water in 423035 acre feet. 1 acre foot = 325 851.427 US gallons. So, 423035 = 325 851.427 * 423035 US gallons = 137846558420.945 US gallons. Approximately 1.37846559 × 1011 US gallons of water are there in 423035 acre feet.
7.481 gallons equal one cubic foot.
One inch of rainfall on one acre is equivalent to 27,154 gallons of water. Therefore, four inches of rain on an acre would be equal to 108,616 gallons of water.