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Mechanical engineer, Marie Adeyemi, helps a team of children to research, design and make a rainwater harvester to irrigate their school garden. The garden is currently watered by children carrying watering cans full of tap water from a classroom. The children realise that as well as being hard work, this is a waste of expensive treated tap water. They assess the area around the garden to see if there鈥檚 any obvious way of collecting rainwater. They look at photographs of rainwater harvesters in Africa, to find out the key features they need to include in their own harvester. Once the children have sketched their initial ideas they build a model so they can iron out any potential problems before making the prototype. They then use a hosepipe to simulate rainfall and test the system. Finally, the children discuss how they can improve their design.