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Underground foul drainage requirements
81NI-wide·Technical Booklet N Drainage
Underground foul drainage shall— (a) consist of pipes and fittings— (i) of such size, layout, construction and watertightness; and (ii) with sufficient ventilation, to ensure the hygienic conveyance o
drainagefoul-drainageundergroundCesspool, septic tank and similar structures construction and siting
83(1)NI-wide·Technical Booklet N Drainage
Any cesspool, septic tank or similar structure shall be— (a) so constructed as to be impervious to both liquid from the inside and subsoil water from the outside; and (b) so sited— (i) as not to rende
drainagefoul-drainagetreatment-structuresite-planning