Coastal Residential Rebuild with LID
La Jolla, CA
Overview
Moment prepared the LID stormwater compliance report for a complete tear-down and rebuild of a single-family home in a coastal neighborhood. The new home includes two stories plus a basement, a 2-car garage, pool, covered patio, and landscaping — all on just 0.17 acres.
The Challenge
Fitting an effective stormwater system on a 0.17-acre lot that already includes a house, basement, garage, pool, and patio leaves very little room for LID infrastructure. Every square foot of planter area had to be carefully placed to capture and treat runoff without interfering with the homeowner’s full building program.
Our Approach
Moment designed a dual planter box system on opposing sides of the lot (south and north), totaling 186 SF of biotreatment area at a media depth of 1.5 ft. The system captures and treats 100% of the Water Quality Volume (214.46 cu-ft) from the 85th percentile, 24-hour storm (0.5 inches). Overflow routes through area drains to the street gutter. Pool and spa equipment was routed to a sanitary sewer cleanout per source control requirements.
Results
The planter box system achieved full MS4 Permit compliance as a Standard Project (less than 5,000 SF added impervious surface) while preserving the homeowner’s complete design program — no compromises on livable space.
Technical Summary
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