How much stone???

[Unregistered-rick]

I am doing a french drain in front of a retaining wall. The trench I am digging is 80 feet long by 1 foot wide by 1 foot deep. I will be using a 4 in diameter pipe in the French drain and filling the hole up with stone to within two inches of the top because the remaining two inches will be filled with topsoil so that I can plant grass. My questions is how many tons of stone do I need to fill the trench and what kind of stone should I use.

Thanks

[tomh]

You need 2.5 cubic yards of washed drain rock. The supplier can do the weight conversion. The yardage is the most important number, because you are filling a given volume and weight per yard can vary. A calculator on the internet at this site says it is 3.5 tons at 2835 yards per ton. Give it a try inputting 1 foot width, 80 foot length and 10 inches thick (0.833 feet).

http://www.csgnetwork.com/aggregatecalc.html

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