Water supply to several areas in Colombo will be disrupted for 15-hours commencing from 9am tomorrow to 12 mid night on Saturday, the National Water Supply and Drainage Board said.Accordingly, water supply to Colombo, Dehiwela, Mt.Lavinia, Kotte, Kaduwela Municiple Council areas, Maharagama, Boralasgamuwa, Kolonnawa Urban Council areas, Kotikawaththa, Mulleriyawa Pradeshiyasaba areas, Rathmalana and Soysapura Housing Scheme areas will be affected by the water cut.