Civil · C-JYK7V

Interceptor Swale

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A standard interceptor swale features an undisturbed or protected slope not to exceed fifteen percent, a water surface kept below the original ground elevation, and a one foot minimum freeboard compacted to ninety percent of the modified proctor maximum dry density per ASTM D1577. The swale is constructed with a two foot minimum level bottom width containing two to four inch rock center unless otherwise specified, and side slopes at two to one or less. Rock check dams are provided every fifty feet or every five feet of vertical fall, with swale grades not exceeding five percent. The outlet consists of rip rap discharging to a stabilized outlet, sediment pond, or level spreader, and may be combined with an interceptor drain if designed as a permanent drainage feature.

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