Section 27(7) in The Kerala Panchayat Buildings Rules, 2011
(7)The rainwater collected in a site shall not normally be allowed to flow in to the drain. It shall be retained in suitable pits of sufficient size taken within the site in order to allow the water to percolate in to the under ground. The pits shall be covered suitably, and arrangements shall be made to direct the water from all parts of the site in to the pit.
