So, the question arises: is it possible to collect enough rain water to satisfy the needs of an urban household? Can their house collect this much rainwater? Therefore, it turns out that the average house in Nairobi cannot collect enough rainwater to serve the unrestricted requirements of the people living in it! There are two reasons for this: firstly, those areas where people rely on rain water have much more rainfall that Nairobi — some even up to double the downpour. It turns out, therefore that the house should be able to store at least 75,000L of rain water.

Source: Daily Nation March 03, 2019 09:00 UTC