Perspectives on civil engineering, hillside construction, grading, and structural engineering in Los Angeles.
Its been an experience, but we are finally getting the latest batch of Altadena drainage plans approved by LA County. Our technique is to keep the existing drainage pattern so we don't have to install stormwater sump pumps.
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This is our first sideways lot in Altadena, with the entrance on the West side and the topography slopes North to South. The goal is to drain as much stormwater to the street as possible using gravity.
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Going through plan checks and getting the current requirements back in a correction, one of the projects had their insurance ask what code LA County is using to require drainage plans on some lots, and not on others.
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This Altadena Drainage Plan is a corner lot fire rebuild. The proposed house sits in a similar location but we need to adjust the existing contours to keep 5% slope 10 feet from the structure at the top.
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Next up in the Altadena fire rebuilds is a grading plan to remove a pool. This will be our first pool removal plan in Altadena. This particular lot is a large one and the County is requiring a grading plan to remove the pool.
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We have another longer lot Altadena Fire Rebuild Drainage Plan. This lot, the front yard doesn't slope as heavily as the previous ones we have seen, which allows more room to slightly regrade the contours.
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LA County wants us to show earthwork numbers for the difference between the existing and proposed soil. Showing the contours in a 3d orbit view always looks interesting and a quick way to tell if the model is looking good or not.
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Any lot that sits on the North side of the block or sideways in Altadena is likely going to require drainage plans. Some South lots might require drainage plans as well.
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Looking at corrections from Building and Safety they wanted us to show the earthwork exhibit. The model is sometimes tricky, but after looking at Altadena surveys, a typical Los Angeles survey is a lot easier to read fast.
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