The Nile was most important to the Egyptians because it delivered water and nutrients for the crops that were grown along the beds of the river itself.
Based on my information, I believe that the higher authorities that would choose the prime ministers would actually be the "house of commons". Going back a few years, many of the "house of commons" actually did not have the responsibility in order to do this, but then, the government figured that it would be better if they were to handle on this responsibility.
