No constructed conveyance that is open or that is designed to be open shall be used in any part of any distribution system that provides drinking water to any member of the public. Examples of open conveyances that are prohibited include but are not limited to open trenches and aqueducts.
N.H. Admin. Code § Env-Dw 402.05
(See Revision Note at part heading for Env-Dw 402) #10609, eff 6-1-14