The requirement of water on the railway is not only far railway staff. But also for the traveling public for whom adequate water is to be made available at railway stations, platform and in retiring room and waiting hall etc. In addition water is also supplied for non-domestic purpose i.e. washing of locomotive, passenger coaches, platform, and washable apron, gardening etc. The demand of water is to be met from a suitable source. This source should satisfy the requirement in terms of quantity as well as quality. The usual sources of supply of water are river, canal, lake and pond, underground water (well) etc. Railway may have its own arrangement for collecting water or it may depend on local government resources for supply of full or partial requirement of water.