Assess Upper Tier Drainage Requirements

What happens here

A point of discussion arises regarding the necessity of installing an additional drainage pipe behind the second course of the upper retaining wall. Given that the entire backfill behind the wall system consists of clean, drained stone, it's argued that any water entering this stone will eventually make its way down to the primary drainage pipe at the base of the lower wall. However, specific project conditions, soil types, and local regulations might necessitate additional drainage considerations for the upper tier to prevent hydrostatic pressure buildup.

Goal: Consider whether supplementary drainage is required for the upper tier of the retaining wall