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This is illustrates a cross-section of a Stormwater Catch Basin with a Sump and Outlet Trap. Its primary purpose is water quality control. It acts as a filter to trap sediment, debris, and trash from rain runoff before releasing the water into natural bodies of water (like a stream). By separating solids and floating debris from the water, it prevents pollution. How It Works (The Process) The system works using gravity and separation layers: 1. Inflow (The Entry): - Water enters the concrete box