Section 57 in The Haryana New Mandi Townships Building Rules, 1967
57. [Section 4(2)(1)].
(1)No down pipe (for the disposal of storm water) shall be built into thickness of any wall except where a proper duct or a chase is provided.(2)A down pipe for a minimum area of 80 sq. Cm. (12.4 inches) shall be provided for every 50 sq. metres (538 sq. ft.) of sloping roof area (slope of roof exceeding 1:48).(3)The run off from the roof, paved area (but excluding paved court-yard) and over flow, if any, from the site, shall not be drained into the under ground sewerage system.
