91. (1) The Corporation may, with the previous sanction of the Government, declare any source of water, spring, river, tank, pond, or public stream, or any part thereof within the City, which is not private property, to be a public water course. (2) The Corporation 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.