French Valley, CA
Retaining Wall & Slope Drainage in French Valley
Looking for retaining wall & slope drainage in French Valley? Temecula Valley Drainage Pros serves French Valley (about 10 miles north of downtown Temecula) and the surrounding Temecula area. Drainage systems for hillside lots and retaining walls — wall weep systems, back-of-wall gravel drains, and slope interceptor drains that relieve hydrostatic pressure and control runoff. Retaining wall and slope drainage in French Valley, for walls that weep and hillsides that send water at the house.
Retaining Wall & Slope Drainage for French Valley homeowners & businesses
What sits behind a wall on these slopes is often Las Posas loam, rated hydrologic group D in the flood district's soils layer, with 35 to 45 percent clay in its argillic horizon over weathered gabbro at 20 to 40 inches. The County's wall standard answers that with a cubic foot of clean coarse gravel per foot and a four-inch perforated pipe.
If the wall is dry but the ground behind the house stays wet, see French drain installation in French Valley.
- Relieves hydrostatic pressure behind retaining walls
- Interceptor drains control hillside and slope runoff
- Protects walls, pads, and downslope structures
Runoff coming down a hillside toward the house, or a retaining wall that weeps, bulges, or stains? Talk it through for your French Valley property.
About French Valley
French Valley is home to roughly 35,280 residents (2020), in Riverside County. French Valley is the most populous unincorporated community in Riverside County, a fast-growing area of newer subdivisions between Murrieta, Winchester, and Temecula at about 1,368 feet elevation. Geographically it is part of the broad valley plain that drains into the Temecula Basin through tributaries of the Santa Margarita River.
Local landmarks include French Valley Airport, Bachelor Mountain, Tucalota Hills.
Retaining Wall & Slope Drainage in nearby areas
Retaining Wall & Slope Drainage questions from French Valley customers
- Does a retaining wall on our lot need a permit?
- Riverside County Ordinance 457 carries the Building Code exemption for retaining walls not over 4 feet in height measured from the bottom of the footing to the top of the wall, unless the wall supports a surcharge. County Building and Safety describes standard retaining wall designs to a maximum of 6 feet, with anything higher requiring an engineered design submitted for County approval.
- What drainage does the County's own retaining wall standard call for?
- The County standard plan states: provide 1 cubic foot per foot of clean coarse gravel with 4 inch diameter perforated PVC drainage pipe at a 1 percent gradient to drain, or omit head joints in the first course. Building and Safety also lists wall drain inspections among the inspections carried out on retaining walls.
- Why does water build up behind walls here when the soil is called well drained?
- Las Posas loam is classed well drained yet described with slow permeability, medium to rapid runoff, and 35 to 45 percent clay averaged through its argillic horizon, over weathered gabbro at 20 to 40 inches. The flood district's soils layer rates the Las Posas units in the French Valley area as hydrologic group D. That contact depth falls inside the backfill zone of a typical hillside wall.
- There is a long slope above our wall. Does that change what is required?
- County grading notes require a paved slope interceptor drain along the top of cut slopes where the drainage path is greater than 40 feet. On the higher ground around this valley the receiving soils are shallow: Friant is mapped at 6 to 20 inches to rock on slopes of 9 to 75 percent, and Lodo at 4 to 20 inches, so intercepted water has little profile to disappear into.
Runoff coming down a hillside toward the house, or a retaining wall that weeps, bulges, or stains
Describe your French Valley property and we will connect you with a local contractor.