Strategies to increase water supply

Question 1

Strategies (3)

Answer 1

Reservoirs
Desalinisation
Diversion/Interbasin transfer

Question 2

Reservoirs

Answer 2

Store water for domestic use
Fills by rainfall or rivers
Can be local or national
e.g 3 Gorges and Yangtze, China
E.g. Lake Vyrnwy

Question 3

Desalinisation

Answer 3

Remove salt from sea water
Expensive and energy intensive
Source of GHG
Uses reverse osmosis - filtration over a partially permeable membrane
Uses distillation  - boiled so condenses
Used by Saudi Arabia, USA and AUS
E.g. Thames water - 400,000 homes

Question 4

Diversion/ Inter basin transfer

Answer 4

Moving excess water from water secure place to water scarce
Tackles droughts
Pumps
E.g. Sindh region, Pakistan