Section Env-Wq 1109.03 - Hydraulic Design: Inlets(a) Return inlets shall comply with Env-Wq 1108.22(a)(1).(b) At least one return inlet shall be provided per 20 gallons per minute (GPM) of total design circulation flow.(c) Inlets shall be located and directed to provide uniform circulation and uniform disinfectant residual.(d) Inlets installed in a pool's walls shall be spaced a maximum of 20 feet, center of inlet to center of inlet, around the periphery of the pool.(e) Inlets installed in a pool's bottom shall be evenly spaced.(f) The return water flow for each inlet shall not exceed 20 GPM.(g) The water velocity through each inlet shall not exceed 20 feet per second (fps).(h) Inlets shall be adjustable to allow for changes in direction of flow.(i) The flow rate at all inlets shall be balanced, which may be accomplished by connecting the inlets by a continuous loop of pipe.(j) Inlets shall be designed so as to not constitute a hazard to the user.(k) Inlets in pools with perimeter overflow systems shall be at least 8 inches below the overflow lip.(l) In any pool wider than 20 feet, wall inlets shall be permanently directed to half the distance to the longitudinal centerline of the pool.(m) At least one inlet shall be located in each recessed stairwell or other space where water circulation might be impaired.N.H. Admin. Code § Env-Wq 1109.03
(See Revision Note at chapter heading for Env-Wq 1100) #8468, eff 11-1-05
Readopted with Amendments byVolume XXXIV Number 19, Filed May 8, 2014, Proposed by #10577, Effective 5/1/2014, Expires5/1/2024 See Revission note.Amended by Volume XLI Number 19, Filed May 13, 2021, Proposed by #13198, Effective 5/1/2021, Expires 5/1/2031 (see Revision Note #3 at chapter heading for Env-Wq 1100) (formerly Env-Wq 1106.03)