Grade Level: 4th Grade
Water was the most important environmental factor in early human settlement and rivers were useful sources of water. They were important sources for fresh drinking water, washing, food, and transportation. Floods are a natural part of river ecosystems and flood control by humans has been practiced since ancient times with methods such as reforestation, and the construction of levees, dams, reservoirs and channels diverting floodwater. Farmers often settled near rivers for steady access to water. The river’s natural flooding could help irrigate their farms and in dry seasons the farmers could dig canals or trenches to direct river water to their crops.
Martinez, Elizabeth, "Earth/Space Science - FLOODS! Erosion by Water" (2019). Model NGSS Lessons: 4th - 5th Grade. 2.