It laid out the basic foundation on society and it created a way so no one has too much power
A purely democratic government would entail a pure vote including all people, of which the decision is made based on the majority. There would be no balance in this situation to account for even a large amount of minority voters.
People needed to move to new areas because of the floods
beyond hunting and fishing the river also gave a chance for growing crop because of the fresh flow of water
