A design drawing of a waterwheel rainwater garden typically includes plans for the integration of a waterwheel into a garden's water management system. This can involve the creation of a rainwater harvesting area, water channels, and a reservoir to store rainwater. The waterwheel is designed to harness the energy of flowing water to power various functions such as pumping water or generating electricity. The garden layout also considers landscaping elements like plants, pathways, and seating areas to enhance the overall aesthetic and functionality of the space.