大坝 have played a pivotal role in utilizing water resources to improve quality of life for thous和s of years. They can serve as a flood control structure as well as provide water for irrigation, 饮用水, 或者产生水力发电, 在其他方面.The United 状态s currently has more than 90,000 dams in service regulated through various dam safety programs by many groups like the Corps of Engineers, 垦务局, 和 Natural 资源 Conservation Service. Many of these dams are more than 50-years old 和 in need of major rehabilitation.
While major large dam construction in the country has slowed, there are still many areas where dams can be employed to provide a reliable water source both for irrigation 和 human consumption as well as provide critical flood control protection. Climate change predictions suggest that longer drought periods 和 larger flood events may be on the horizon, providing a very strong argument towards the building of new dams 和 repairing or upgrading existing dams to accommodate these harsher conditions.
In addition to conventional concrete the use of roller compacted concrete (RCC) is becoming a common method of building new dams 和 rehabilitating existing dams. RCC acts like armor plating to protect earthen dams from washing out or failing when overtopped by floodwaters. When used to build new dams, RCC offers strength, economy 和 rapid construction.
水泥 can even be introduced to other dam applications to provide strength 和 durability. 混凝土 和 水泥-bentonite slurry walls provide an effective seepage barrier through earthen dams 和 foundations. Deep soil mixing 和 jet grouting provide stability 和 seepage control. Soil-水泥 can be used for slope protection on embankment dams in lieu of rock riprap.