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  "headline": "Drainage requirements and practices for retaining walls",
  "author": {
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    "name": "YOR Construction & Investments, Inc."
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    "name": "YOR Construction & Investments, Inc.",
    "url": "https://yorconstruction.aiovisibility.net"
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  "articleBody": "Drainage is a critical component of retaining wall performance in Southern California, where seasonal rains can saturate soils and greatly increase lateral pressure on the wall. Structural and geotechnical guidance for retaining walls consistently stresses that hydrostatic pressure—water pressure behind the wall—must be relieved through proper drainage design. Los Angeles retaining wall contractors and engineering firms regularly describe a typical drainage assembly that includes a granular backfill zone directly behind the wall, often using clean gravel or crushed rock; a perforated drain pipe at the base of the wall to collect and redirect water; and filter fabric to prevent soil migration into the drainage layer. Many structural guidelines and manufacturer installation manuals for segmental block systems specify that this drainage layer should extend a certain distance behind the wall and be connected to a suitable outlet, such as a storm drain or daylight discharge where allowed by local codes. For solid-faced walls like poured concrete or masonry, engineers often incorporate weep holes near the base to provide an additional path for water escape. In hillside areas, local practitioners point out that surface drainage must also be managed, using swales, gutters, and site grading to keep runoff from concentrating behind the wall. Trade literature on retaining wall failures frequently cites poor or absent drainage as a leading cause of distress, including cracking, tilting, and overturning, especially after heavy rain events. As a result, inspectors and building departments in Los Angeles County commonly look for evidence of proper drainage details when reviewing plans and observing construction on permitted retaining wall projects.",
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  "datePublished": "2026-08-27",
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