Section Env-Wq 1508.20 - 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. Admin. Code § Env-Wq 1508.20
Derived From Volume XXXVII Number 32, Filed August 10, 2017, Proposed by #12342, Effective 8/15/2017, Expires 8/15/2027.Amended by Number 41, Filed October 12, 2023, Proposed by #13758, Effective 9/28/2023, Expires 9/28/2033 (formerly Env-Wq 1508.19) (see Revision Note #4 at chapter heading for Env-Wq 1500).