W Marigold St Drainage: 11ft Slope, ADU, Rain Gardens
Drainage plan and hydrology report for an Altadena rebuild on an 11-foot sloping lot: flowlines around the house and ADU, lined rain gardens both sides.
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Hydrology
Posts about hydrology reports: pre/post flow calculations, why LA County and LADBS require them, and how we use them to avoid sump pumps.
ADU Timing: Ask Before Altadena Plans Are Approved
LA County often requires sump pumps on Altadena rebuilds. Planning an ADU later? Extra engineering now can save $15,000 to $20,000 in pump costs.
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Skipping the Sump Pump and LID Covenant in Altadena
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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Driving Through Altadena After the Fire
A first-hand drive through the Altadena fire aftermath, and a look at a hillside rebuild we're engineering: drainage plans and a hydrology report.
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