SWALE

Definition

An excavated drainage way constructed and located to convey runoff to a desired location.

Purpose

The purpose of a swale is to prevent runoff from entering disturbed areas by intercepting and diverting it to a stabilized outlet or to intercept sediment laden water and divert it to a sediment trapping device.

Conditions Where Practice Applies

Swales are constructed:

1.   To divert sediment laden runoff from a disturbed area to a sediment trapping device.

2.   Across disturbed areas to shorten overland flow distances.

3.   To direct sediment laden water along the base of slopes to a trapping device.

4.   To divert clear water from an undisturbed area to a stabilized outlet. Runoff shall be discharged at non-erosive rates.

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