Dry ponds

Also known as infiltration basins.

Overview

Dry ponds are recommended as flood control structures to accommodate occasional excess overflow downstream of other structural BMPs. They should be integrated into the landscape as useful, accessible public space.

Design

Sizing

The surface storage volume of a dry pond is simply determined:

${\displaystyle A_{$pond}={\frac {\left(RVC_{T}\times A_{catchment}\right)}{\left(q\times t_{drawdown}\right)}}}

Flood control

Ground depression acting as a flow control and water treatment structure, that is normally dry.

Depressed storage area, designed to capture flood events.

A body of water smaller than a lake, often artificially formed.

The land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale.