With two rivers, Kollam is endowed with perennial supply of water. In order to augment the irrigation potential, several plans were evolved during 1953 to undertake river basin schemes. Kallada Irrigation Project, the biggest multipurpose project, undertaken by the State Government, is intended to utilise the water of Kallada river, mainly for irrigation purpose in Kollam, Pathanamthitta and Alappuzha districts. There is also a proposal to generate 50 M.W. of electricity from the dam at Thenmala.