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Land damage or land degradation occurs a lot on land dry especially in parts planted with food crops and smallholder plantations. Land degradation occurs because land is often open by clean soil and weeding work so the soil is easily eroded. Concession of barren land into agricultural land is not economical because of its already low productivity. Until now, the business according to Wahono (2002: 3), degraded land use is an element of the protection of nature and environment. Degraded land is a land that has undergone soil conditions or the process of physical, chemical or biological. a) Dam Height Is the distance from the foundation to the water surface of the reservoir when the overflow building flows water as large as its planning capacity, coupled with a certain height for wind, wave, ice freezing and earthquake motion b) The width of the lighthouse The width of the dam dam must be strong enough to keep the surface line or the surface of the seepage still a. Topography If a review is only based on topographic conditions, concrete dams will be more profitable. If the building is in a de*p but narrow river channel. on the contrary, in shallow but wide river grooves, the dam will be cheaper. However, due to the many other factors that need to be taken into account between the geological conditions in the prospective dam area, the availability of quality-fulfilling materials. Read More »1) Dams for water supply and irrigation, contain water in the reservoir. This water is then channeled to cities or agriculture using large pipes or can*ls. 2) Hydropower Dam, uses water to drive turbines to generate electricity. After pas*ing through the water turbine then it is released back into the river which is located below the dam. 3) Flood control dam, accommodates