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## Main Question or Discussion Point

I know absolutely nothing about physics, math or anything remotely similar.Perhaps some of you can help me.Here is my situation. There is a hill on our property with no water supply and I want to start a vegetable garden down the hill.The plan is to have a 600 gallon water storage tank at the bottom of the hill with a 4" drain pipe running from the tank to the top of the hill where it can be attached to another 600 gallon truckbed tank for drainage.I havent bought any of this stuff yet and was wondering how long it will take to drain the truckbed tank down the hill through the 4" pipe and fill the storage tank at the bottom of the hill.All drainpipe fittings are 4".The hill is at a fairly steep slope(I dont know for sure what the exact angle is but maybe you can estimate)the tank is located about 130' from the top of the hill.How long will it take to empty the tank?Thanks.any help is greatly appreciated.