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Posts about hydrology reports: pre/post flow calculations, why LA County and LADBS require them, and how we use them to avoid sump pumps.
A drainage plan and hydrology report for an Altadena fire rebuild where the site slopes 11 feet from street to rear. We designed flowlines around the main house and proposed ADU, added plastic lined rain gardens on both sides, and used the hydrology report to show pre-fire impervious was greater than proposed.
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LA County often requires pumps on Altadena fire rebuild projects. But there are ways to get around that requirement. If you are planning to add an ADU later, doing the extra engineering now could save $15,000 to $20,000 by avoiding sump pump requirements.
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We recently got a drainage plan approved in Altadena without requiring a sump pump or a LID maintenance covenant. Here is the engineering behind why it worked.
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A drive through Altadena to see the aftermath of the fire, and a first look at a project we're engineering - drainage plans and hydrology report for a hillside residential rebuild.
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