Section 82(1) in Assam Notified Urban Areas (Other than Guwahati) Building Rules, 2014
(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.
