crossings of railroads, and to compel any such railroad to raise or lower its tracks to conform to such provisions or changes; and to require any railroad company to fence its rai lroad, or any part thereof, to provide suitable protection against injury to persons or property, and to construct and repair ditches, drains, sewers, and culverts along and under its tracks, so that the natural drainage of the streets and adjacent property  shall not be obstructed. Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 719 ( u ) To provide for the construction, maintenance, and regulation of the navigation of canals and water courses, and to cleanse and purify the same; and to provide for or regulate the drainage and filling of private premises when necessary in the enforcing of  ordinances drafted by the Philippine Health Service in accordance with law. ( v ) To provide for the construction and maintenance of public landing places, wharves, piers, docks, and levees, and to regulate and control the use of the same, and of all private landing places, wharves, piers, docks, and levees. ( w ) To maintain waterworks for the purpose of supplying water to the inhabitants of the city; to purify the source of supply, regulate the control and use, and prevent the waste of the water; to fix and provide for the collection of rents therefor; and to  regulate the construction, repair, and use of hydrants, pumps, cisterns, and reservoirs. ( x ) To provide for the establishment of, and regulate and maintain public drains, sewers, latrines, and cesspools. (y) Subject to the provisions of ordinances drafted by the Philippine Health Service in accordance with law, to provide for the establishment of public laundries, stables, and bath houses and regulate their use. ( z ) Subject to the provisions of ordinances drafted by the Philippine Health Service in accordance with law, to provide for the establishment of public markets, market houses, and slaughterhouses, and regulate their use; to tax, license, regulate, or prohi bit the establishment within the city of such institutions by any other person, entity, firm or corporation, except the city; and to tax, license, and regulate the business and fix the location of tanneries, renderies, tallow chandleries, bone factories, a nd soap factories.