1. To prevent drought because South Africa is considered one of the 30 driest countries in the world.
2. To store rainfall (to prevent drought).
3. Dams change daily flows by releasing water as a reaction to demands for irrigation, energy, etc.
las lenguas que mas se hablan en baja california es mixteco y zapoteco
Saying that the sord they used isn't what you think it means maybe im not sure any more info you could give