This STEM lesson plan is great to use after students have learned about the water cycle and evaporation. We learned with technology videos from Discovery Education but you can use any methods to teach the facts you would like. The students are introduced to the performance task, creating a pool cover for a pool company because the clients are complaining about always having to fill up their pools. The students sketch, create, gather data, and evaluate their pool covers over the course of a few days. They compare data and make changes to their first pool covers when creating a second one to make it more efficient. Enjoy!