High technology approach (THE ASWAN DAM):
- R. Nile's tributaries start in Ethiopia - there is a wet/dry season
- R. Nile is effected by this and either floods or dries up
- People want a constant water supply for irrigation.
- The dam was completed in 1970
- It created a lake called lake Nasser which is 560km long
ADVANTAGES
- HEP Produced which allows the country to become more developed
- HEP station now provides half of the power in Egypt
- Irrigation for farmers - crops can be watered all year round
- More crops mean more food for the people of Egypt
- River doesn't get flooded anymore
- More self sufficient - less dependent on outside help
DISADVANTAGES
- Billharzia is now caused by snales living in the lake
- The delta increases in size by 20 - 30 metres each year
- Because of this the land is less fertile
- Could harm fish in the sea
Low technology approach (Rainwater harvesting):
- Rainwater harvesting is when a small dam is built to stop water flooding off a slope
- This makes fertile soil which crops can be grown in
- This is good for managing semi - desert conditions
- Its cheap
- Good for the environment
- And has low maintenance
- An example is the Jaisalmer district of India
