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.
Source. #9343, eff 1-1-09; ss by #12342 (formerly Env-Wq 1508.18); ss by #13758, eff 9-28-23 (formerly Env-Wq 1508.19); ss by #14472, eff 1-19-26, EXPIRES: 1-19-36