79. (1) A Paurashava may, with the previous sanction of the Prescribed Authority, declare any source of water, spring, river, tank, pond, or public stream, or any part thereof within the municipality, which is not private property, to be a public water-course. (2) A Paurashava may, in respect of any public water-course, provide such amenities, make such arrangements for life saving, execute such works, and, subject to the provisions of any law for the time being in force relating to irrigation, drainage and navigation, regulate the use thereof , as the by-laws may provide.