South Africa has been pounded by heavy rains for the last several weeks. Several people have been killed and settlements and farms across the country have flooded.
The Vaal River is the main source of water for Joburg and the surrounding Gauteng Province, and the floodgates have literally been opened at the Vaal Dam. (Interesting fact: Johannesburg is the only major city in the world that is not located on a major body of water.)
