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The process for the basic section shape determination is as follows: 1) Under the case that a designed earthquake occurs when the reservoir water level is FSL,.Illustration of dam-parts in a typical cross section. ▫ Free board: The space between Based on the functions of dams, it can be classified as follows:. Based on the functions of dam, it can be classified as follows: 1. Storage dams 2. Diversion dams 3. Detention dams 4. Debris dams 5. Coffer dams 11LAKSHMI The purpose of a dam is to impound (store) water for any of several reasons, e.g., flood control, water supply for humans or livestock, irrigation, energy Components of Dams | Functions of Components of Dams · Core: · Shell: · Transition filters: · Cut off trench: · Sheet pile wall: · Impervious stream blanket: · Rip rap A diversion head works serves the following functions: 1) It raises the water level on its upstream side. 2) It regulates the supply of water into canals.