Flash flooding has changed the shape of our land and eroded away our precious soil leading to mudslides that have destroyed homes and businesses. Low-lying gardens and pastures that have been flooded are no longer suitable for planting crops or raising livestock. Repeated flooding also fills the creeks and streams with silt and dirt, further raising the water level. Thousands of dollars each year are spent repairing roads and bridges that are cracked or broken and possibly even washed away altogether. My second grade students have been comparing multiple solutions that they have designed and created to prevent the water from changing the shape of the land. Students are creating land models ,which may include mountains,
rivers, and lakes. These are actual soil models and rain simulators that will be used so that runoff and erosion totals can be measured. Students record their findings and communicate this data by creating and displaying bar graphs. They are responsible for analyzing the data to determine strengths and weaknesses of each solution model.