Explanation: I have read a few articals about this in my spare time and it said that when it turns into summer they mostly rely on summer rain to help them with there crops
Dams and Canals are commonly built to serve a wide range of purposes to aid humans activities in their environment. While they are being used for management of flood water, they also serve as a source of fertile soils for crop cultivation, with activities such as irrigation.
Hence, Dams and Canals are a source of the floodwater that brought fertile soil for growing crops
