Section Env-Wq 1109.05 - Hydraulic Design: Skimmers and Overflow Systems(a) Each component of a skimmer or overflow system shall comply with Env-Wq 1108.22(a)(1).(b) The total capacity of all skimmer/overflow systems in any pool shall be at least 100% of the required flow of the circulation system, constructed to provide overflow return around the entire periphery of the pool.(c) There shall be one skimmer for 500 square feet of pool surface or fraction thereof and no less than 2 skimmers total.(d) Skimmers shall: (1) Be located so as to maintain effective skimming action over the entire water surface of the pool;(2) Have proportioning valves that are adjusted such that the flow rate through the skimmers removes debris from the water surface;(3) Have a minimum intake throat width of 5 inches, measured at the weir location;(4) Have a weir that adjusts automatically to variations in water level of at least 4 inches; and(5) Be installed so that the operating level of the pool is not more than 9 inches below the finished deck level.(e) No skimmer on a pool installed after May 1, 2014 shall be equipped with an equalizer line. If a skimmer installed prior to May 1, 2014 is equipped with an equalizer line, the suction outlet shall be fitted with a cover that meets the requirements of ANSI/APSP/ICC-16, 2011, available as noted in Appendix B.(f) The flow rate through any individual skimmer shall not exceed the maximum flow rate of the skimmer as certified by its manufacturer.(g) Skimmer piping shall be sized to handle the maximum flow rate for the required number of skimmers, but in no case less than 100% of the design flow rate.(h) Overflow systems shall be capable of handling 100% of the circulation flow without the overflow troughs being flooded.(i) Surge capacity equal to or greater than one gallon per square foot of swimming pool water surface area shall be provided either in the system or by use of a surge tank.(j) The water level of the swimming pool shall be maintained above the level of the overflow rim, except for the time needed to transfer all of the water that may be in the surge capacity back into the swimming pool after a period of use.(k) Perimeter overflow system piping shall be sized to handle 100% of the design flow rate.N.H. Admin. Code § Env-Wq 1109.05
(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 1106.05)