A retention basin is a facility intended to hold stormwater for a period, often with no regular surface discharge under its design conditions. Water may infiltrate, evaporate, or be reused, depending on the system. Soil, groundwater, safety, and local rules affect feasibility. The term can be used differently across agencies, so project documents define the facility.
Why it matters for owners
Retention assumptions affect site suitability, permitting, and ongoing maintenance. Confirm the intended function with the reviewing authority.
