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The rainfall  map indicates the average rainfall in South Africa. In order to design a rainwater harvesting system it is critical that you look at the average rainfall in the area that you want to install the system. The rainfall will determine the design and size of the system.  Major benefits can be derived from rainwater harvesting in the areas with the high rainfall. As part of our concept evaluation our team looks at the climatic data relevant to each area. This is a key design parameter that will determine the size and complexity of recovery and storage system. 

South Africa rainfall map South Africa rainfall map

Coastal cities with high rainfall (dark blue area) can gain the most with installing rainwater harvesting systems - See this article