1) резервуар, ёмкость, бак
2) водохранилище; водоём
- annual storage reservoir
- balancing reservoir
- clear-water reservoir
- cold reservoir
- compensating reservoir
- day-supply reservoir
- detention reservoir
- distribution reservoir
- equalizing reservoir
- flood control reservoir
- groundwater reservoir
- head reservoir
- heat reservoir
- impounding reservoir
- off-channel reservoir
- retaining reservoir
- retarding reservoir
- retention reservoir
- service reservoir
- storage reservoir
- water-supply reservoir