Drainage Calculators

Site drainage is about moving water away from where it causes problems — a wet basement, a soggy lawn, a slope that erodes. The French Drain Calculator sizes the core of a gravel drainage trench: the washed stone (the trench volume minus the pipe), the length of perforated pipe, and the filter fabric to wrap it, from the trench length, width and depth. A classic French drain is just the gravel-filled trench; adding a perforated pipe at the bottom multiplies the flow capacity for almost no extra cost, which is why most modern installs include one. The calculator gives the stone by both volume and weight so you can order however your supplier prices it. Catch basins, cleanouts, pop-up emitters and the outfall connection are separate.

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