French drain question on a small flat lot in high desert Idaho
I have a question regarding how I should approach the French drain I will need for a small house (basement) and the adjoining shop (crawlspace). The lot is 80′ x 100′ and is basically flat. It is not in the floodplain. I spoke with the local building inspector and he said that folks do install French drains so I want to have a strategy. I am curious to hear how a pro might approach this problem. Could I dig out a large cavity during excavation (and fill with aggregate) as a basin towards which I could direct the pipe? It’s pretty arid here (but there is snowpack and runoff).
I will post a diagram later showing how a diversion strategy.
I’m basically confused as to how to deal with the different elevations of the footings and how to slope the pipe given there isn’t much grade to work with. About how far away from each structure is a safe distance to have an exit?
For site data, there is about 16 inches of annual rainfall (precipitation) according to my research.
Thanks in advance.
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