Water availability is crucial for agricultural activities, in the dry seasons or at time of reduced rainfalls, water becomes a rare commodity. Harvesting rainwater can offer a solution to increase water availability during the dry season. This practice describes how to harvest rainwater in Kenya. Rainwater harvesting is the collection and concentration of runoff water from the land surface, before it is lost to a stream or river. It makes more water available for agricultural, household or other needs. This practice introduces rainwater harvesting methods, in particular semi-circular hoops. It explains what hoops are, where they can be used, and describes six steps to construct a hoop. It also offers an overview of potential problems and solutions when building and using a hoop, as well as a case study from the Makueni district in Kenya.