Answer:
Flooding from these rivers largely impacted the development of Sumerian society, both negatively and positively. Floods deposited minerals such as silt which brought fertile soil, but they were also largely destructive. This constant flooding pushed innovation forward, Sumerian farmers created the agricultural technique of irrigation to hold back the flood waters while still benefiting from their minerals. As more areas opened up for farming, it allowed for further expansion and a widespread surplus of crops; furthering both technological & agricultural development.