Is there any write up on weep hole design for retaining wall? I'm especially intereted in how one would specify the spacing & size of the weep hole. Most retaining walls are seperated by a layer of cohesionless material such as sand, aggregates, rock frafment etc. I'm assuming the layer of sand & the weep holes serve to release the hydrostatic pressure & lowering the water table. However, the rate of flow or seepage is not addressed. Thanx in advance
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