Do I Need a Permit for Retaining Wall Drainage?
Often — the wall's drainage (the 4-foot+ — the permitted's; the repair's — the exempt's sometimes) follows (the wall's — the permit; the drainage's — the included). The new (the permitted — the wall's; the drainage's — the designed), the repair (the French's — the added; the exempt's — the often), and the discharge (the neighbors' — the directed; the city's — the storm's). The permit follows the wall's.
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The new wall's
The 4-foot (the permitted's — the engineered; the drainage's — the designed), the geogrid (the MSE's — the included; the 12-inch lifts'), the drain (the perforated's — the daylighted; the 4-inch), and the inspection (the base's — the backfill's; the compaction's).
The retrofit's
The French (the added — the footing's; the 12-inch; the fabric's), the weeps (the drilled — the 4-foot o.c.; the drained), the surface (the swale's — the diverted; the gutter's), and the permit (the exempt's — the often; the ROW's — the sometimes).
The discharge
The daylight (the slope's — the outletted; the riprap's), the storm (the city's — the connected; the permit's), the neighbors' (the directed — the away; the liability's), and the maintenance (the cleaned — the outlets'; the inspected). The drainage's — the wall's life; the 90%'s — the failures' cause.
The bottom line
New retaining walls (4+ ft) need permits with engineered drainage (perforated pipe, geotextile, daylighted outlets) — retrofit French drains are often exempt; never discharge onto neighbors.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.