De qué está hecho presa
A structure that holds back water.
- Concrete dam wall — tiene como parte. A mass of concrete that holds back the water by its weight.
- Dam spillway — tiene como parte. It lets floodwater through.
- Dam gates — tiene como parte. They regulate the release of water.
- Gravitación universal — utiliza. Stability through its own weight.
- Hormigón romano — está hecho de. Ancient dams; modern ones are made of concrete.
- Hormigón armado — está hecho de. Concrete dams.
- Piedra — está hecho de. Sadd el-Kafara (~2700 BC) is an embankment of stone.
- Arcilla — está hecho de. The core of the dam is clay and earth.