Reservoir re-housed, historical artifacts moved or rare environments relocated. Examples include the temples of Abu Simbel (which were moved before the construction of the Aswan Dam to create Lake Nasser from the Nile in Egypt), the relocation of the village of Capel Celyn during the construction of Llyn Celyn, and the relocation of Borgo San Pietro of Petrella Salto during the construction of Lake Salto. Construction of a reservoir in a valley will usually need the river to be diverted during part of the build, often through a temporary tunnel or by-pass channel. In hilly regions, reservoirs are often constructed by
Lake Nasser ability to generate electricity. There are pumping stations that control the water going into Lake Nasser, and currently this project generates 10 billion kilowatt-hours of hydroelectric power each year to Egyptians. A fish enclosure was built in Lake Nasser. Fishing among tourists, especially for Nile perch, has become increasingly popular, both on the shore and from boats. Although the Abu Simbel and other temples were physically moved to a higher ground and to different sites to spare their destruction by the new lake, other ancient Egyptian sites like the massive fortress of Buhen were flooded and are now at the