[Cob] RE: level trench

[Lance Collins]

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I don't have experience with trenches to know how much slope for drainage 
is desirable but with a 1 in 80  slope (i.e. 6 inches over 40 feet) the 
water runs very well along the spouting on my shed .

>For an accurate slope for drainage, attach a jig to a
>3 ft level.  A piece of wood cut diagonally from one
>corner to 3 inches will give you a slope of 1 inch for
>every foot.


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