The adjective in that phrase is CHOCOLATE. It is describing what type of Swiss cheese it is.
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.
Answer:
ahchiii DISGUSTING bouva bluhhhhhhhhhh