Hi, we have a building site which is in a terrace area surrounded by steep vegetated slopes (~30%). The site soils are sandy silts / silty sands. The site is in an undeveloped area and the city office is "encouraging" us to use infiltration systems to manage rainfall water. We are planning to use permeable pavements, paver block parking lots and percolation pits and trenches. My question is about what are the considerations for placing percolation systems such as percolation pits and trenches close to the top of the slopes. Are any typical recommendations for setback? We need to do a slope stability analysis but just wondering if there are any standard guidelines. Also, I just found a design guideline for San Diego City, CA and it says: "maintain a 15-foot setback from all parts of the disposal trench to daylight on the slope." This may be a good start point.
For example, for building foundations, we do not want to install percolation pits closer than 10-foot from the foundations. This is a standard recommendation.
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