I've put forward a proposal to the Environmental Agency to retain my riverbank using 900mm high 75mm dia live willow spiles angled into the bank at 20 deg. Backfilled to the top with soil which will repose away from the edge upwards at an angle of 20 deg. below the soil is a foundation of igneous rock. They would like see a calcultaion to demonstrate how deep the spiles need to be sunk into the river bed to remain stable. I have no idea how to calcultae this, does anyone out there have a formula I could apply?
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