Test of overflow spillway with geomembrane liner built on an earth check dam
Liu Ji-guang · Journal of China Institute of Water Resources and Hydropower Research · 2006
The authors put forward a technical plan of building overflow spillway on the downstream slope of earth check dams by using geomembrane liner.A group of tests were carried out on the site of Songjiagou earth check dam.Two types of spillways with smooth slope and stepped slope were tested.The test results showed that both types of spillway were stable in structure.The stepped spillway was more effective in energy dissipation with a maximum velocity of 3.1m/s at the end of spillway,while the other had its maximum velocity of 10.7m/s.The scour resistance capalility of geomembrane to sand and gravel needs further study.As far as the construction convenience,material consumption and the cost were concerned,the smooth slope spillway has more advantages.The authors believe that the two types of spillway would be applicable in earth check dam projects after some further improvement.