The Mwanza region is prone to drought, with unreliable seasonal rainfall, so conserving water is an important issue. Methods of rainwater harvesting vary, but some of the most efficient involve the using a corrugated iron roof as a catchment area, with guttering transferring the water to external tanks, large fired clay pitchers or cement jars, or even underground storage tanks. The use of these methods is an integral part of MRHP’s training on environmentally sustainable building techniques.
It is very important to ensure that the rainwater is kept clean from contamination, including preventing dirt from the roof being washed into the tank and insects or small animals drowning in the tank. All tanks or containers should be kept covered and to ensure the roof debris is not washed into the tank, the downpipe can be disconnected when the first rains come.