When constructing a retaining wall in California that exceeds 4 feet in height, which of the following is required by the CBC regarding drainage behind the wall?
Correct Answer
C) A drainage system with perforated pipe and gravel backfill
CBC Section 1807.2.3 requires retaining walls to have adequate drainage systems including perforated drain pipes and gravel backfill to prevent hydrostatic pressure buildup. This is critical in California due to seasonal rainfall patterns and seismic considerations where excess water pressure could compromise wall stability during ground movement.
Why This Is the Correct Answer
CBC Section 1807.2.3 requires retaining walls to have adequate drainage systems including perforated drain pipes and gravel backfill to prevent hydrostatic pressure buildup. This is critical in California due to seasonal rainfall patterns and seismic considerations where excess water pressure could compromise wall stability during ground movement.
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