Section 82 in Assam Notified Urban Areas (Other than Guwahati) Building Rules, 2014
82. Conservation and Harvesting of Rain water.
(1)Effective measures shall be taken within each premise for conservation of rainwater, and rainwater-harvesting structures at least to the following standards and method as provided in Schedule VI and the same shall be provided; the same shall be shown in the plan applied for permission:-(a)for buildings of height upto Ground + 1 Floors, percolation pits of 30 cm diameter and 3m depth may be made and filled with broken bricks (or pebbles) for 2.85 m and the top covered with perforated Reinforced Concrete Cement (R.C.C.) slab. These percolation pits may be made at intervals of 3m center to center along the plinth boundary. The rain water collected in the open terrace may be collected through a 150 mm PVC (Poly Vinyl Chloride) Pipe laid on the ground and may be allowed to fall in the percolation pits or into a open well through a seepage filter of 60 cm x 60 cm (filter media broken bricks) provided before the open well which shall improve the ground water level. A dwarf wall of 7.5 cm height is built across the entry and exit gates to retain water and allow it to percolate within.(b)for special building, Group Developments, Multi-storeyed Buildings, Industries and Institutional Building there shall be a pebble bed of 1 metres width and 1.5 metres depth all round the building and filled with rounded pebbles of 5 centimeter to 7.5 centimeter size. The concrete paving around the building has to be sloped at about 1 in 20 towards the pebble bed, so that rain water from the terrace and side open spaces flow over this pavement and spread into the pebble bed around. Dwarf walls in masonry of 7.5 centimeter, height shall be constructed at the entrance and exit gates to retard rainwater collected into the compound from drawing out to the road.(2)Additional regulations for all buildings.-(a)in the ground floor, floor level of water closets shall be at least 0.9 metres above the road level to ensure free flow;(b)all centrally air conditioned buildings shall have their own wastewater reclamation plant and use reclaimed wastewater for cooling purposes.(3)In addition, every Group Housing Scheme, Apartment or commercial complexes and Institutional buildings etc. shall be provided with required facilities and infrastructure for conservation and harvesting of rain water, namely:-(a)Percolation Pits:- The paved surface around the building shall have percolation pits of 1.2m x 1.2m x 1.2m covering at least 30% of such area. Such pits shall be filled with small pebbles or brick jelly or river sand and covered with perforated concrete slabs;(b)Terrace water collection:- The terrace shall be connected to a sump or the well through a filtering tank by PVC pipe. A valve system shall be incorporated to enable the first part of the rain water collected to be discharged out to the soil if it is dirty;The filtering tank measuring 0.6 m to 1.2 m square can be constructed near the sump. A tank can be divided by a perforated slab and one part shall be filled by small pebbles and other by brick jelly. The bottom portion of the tank shall have slope to avoid stagnation of water;(c)Open Ground:- Whenever there is open ground a portion of top soil shall be removed and replaced with river sand to allow slow percolation of rain water.(d)Piped recharged
