Section 61 in Haryana Urban Development Authority (Erection of Buildings) Regulations, 1979
61. Water closet.
(1)Every water closet plan shall have an efficient siphon trap with a minimum water seal of 75 mm beneath so that sufficient water seal, between the pan and any drain or soil pipe is maintained.(2)No part of the water closet apparatus shall be directly connected with water supply distributing pipe for flushing and cleaning of the pan, a special close cistern with suitable ball cock and not less than 12 liters capacity shall be provided.(3)The capacity of every reserve tank shall be at the scale of 70 liters not for one water closet connected to the tank and 280 liters for each additional seat in the same premises.(4)No self-acting or automatic flushing apparatus be constructed or fixed except with prior permission of the Estate Officer.(5)Where the water closet discharges into a soil pipe which also receives discharge from another water closet, the trap of the water closet shall be ventilated by a pipe which shall :(a)have an internal diameter of not less than 50 cm.(b)be connected with the arm of the soil pipe at point not less than 7.5 cm and not more than 30 cm from the highest part of the trap, on that side of the water seal which is nearer to the soil pipe and in the direction of the flow; and(c)either have an open and as high as the top of soil pipe at or be carried into a soil pipe at a point not less than 2.0 metre above the highest connection to the soil pipe.
