N.H. Code Admin. R. Env-Wq 1508.19

Current through Register No. 25, June 20, 2024

Section Env-Wq 1508.19 - Stormwater Control and Conveyance Practices: Conveyance Swales

Conveyance swales shall comply with the following:

(a) Swales shall not be used in groundwater protection areas where the stormwater comes from one or more high-load areas, unless the practice has an impermeable liner;

(b) The side slopes shall be designed to convey non-erosive velocities; and

(c) The swale shall be sized to convey the 50-year, 24-hour storm.

N.H. Code Admin. R. Env-Wq 1508.19

(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09

Amended by Volume XXXVII Number 32, Filed August 10, 2017, Proposed by #12342, Effective 8/15/2017, Expires 8/15/2027.