Site & Civil / Storm drainage inlet
Catch basin
/kætʃ ˈbeɪ.sən/noun
From catch, Anglo-Norman cachier, and basin, Old French bacin, “bowl.”
Definition
A below-ground chamber with a grate at the surface that collects runoff and lets sediment settle in a sump before water flows into the storm pipe.
Fig. 101 — Catch basin: schematic studyNOT TO SCALE
Illustrative study — Catch basin · AI-generatedSAMPLE IMAGE
Photo study — Catch basin · AI-generated00:06
Structural & construction notes
The outlet sits above the bottom so debris is trapped and must be cleaned out periodically. Grates are rated for the traffic above them, and pipe inverts set the flow between structures.
An educational reference. Project-specific design requires professional guidance.