A catch basin in architecture is a structure designed to manage stormwater by collecting and directing runoff from surfaces like streets, sidewalks, and roofs into a drainage system.
It typically consists of a grated inlet at ground level that allows water to flow in while preventing large debris from entering. Beneath the grate, a sump or sediment trap collects solids and prevents them from clogging downstream pipes.
Catch basins play a crucial role in controlling water flow, reducing flooding, and protecting infrastructure by ensuring proper drainage. They are commonly found in urban areas, parking lots, and landscaped spaces, integrated into stormwater management systems to maintain safety and environmental balance.
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Image of Catch basin detail and downloadable (in DWG) link below
Catch basin detail drawing – 1
A catch basin detail drawing in construction typically includes several key components and annotations to illustrate its structure and function. Here’s a verbal breakdown of what you’d find in such a drawing:
Grated Inlet (Top View):
- A rectangular or square grate at ground level, allowing water to flow into the basin while blocking large debris.
- Dimensions of the grate, typically noted in millimeters or inches.
Basin Structure (Section View):
- A concrete or precast structure below the grate, forming the main body of the catch basin.
- Dimensions of the basin (length, width, and depth) are specified.
Inlet and Outlet Pipes:
- Inlet pipes bring runoff into the basin, often shown sloping downward toward the basin.
- Outlet pipes direct water out of the basin and into the drainage system, usually positioned slightly higher than the basin floor to allow sediment to settle.
Sump (Sediment Trap):
- A recessed area at the bottom of the basin, below the outlet pipe, designed to collect sediment and debris.
- The depth of the sump is noted, typically ranging from 150–600 mm (6–24 inches), depending on the system.
Materials and Reinforcement:
- Concrete thickness is specified, often reinforced with steel rebar for structural integrity.
- Waterproofing or protective coatings may be noted.
Notes and Specifications:
- Maintenance access points, such as manholes or removable grates.
- Slope of connecting pipes, usually around 1–2% to ensure proper flow.
- Reference to construction codes and standards.
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