Section Env-Wq 704.18 - Inverted Siphons(a) Inverted siphons shall have not less than 2 barrels with a minimum pipe size of 6 inches.(b) Maintenance manholes and appurtenances shall be provided at both ends of the siphon to facilitate convenient flushing and maintenance of the siphons.(c) Pipe sizes and a hydraulic head shall be selected to secure velocities of at least 3.0 feet per second for average design flows in each siphon.(d) The inlet and outlet details shall be arranged so that flow can be diverted to one barrel, so that either barrel may be taken out of service.N.H. Code Admin. R. Env-Wq 704.18
Adopted byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.