The design and construction of dams is multi-facet activity which requires diversified engineering input in a proper sequence. The above sections carry out the tasks which involve; geological investigation and studies for proper design of foundation of dams, hydrological studies to establish the quantum of water available for storage , evaluation of various sites to establish suitability from safety and economic consideration, selection of dam body , establishment of optimal dam height , study for environmental impact and study for constructability of the dam, etc.