Why has the perennial system of irrigation replaced the basin system of irrigation for farmers near the Nile River?

Question

anonymous · Answer

http://answers.yahoo.com/question/index?qid=20110531023538AAjucT4

anonymous · Answer

try and use this 4 help

ashleyisakitty · Answer

Basin systems usually allow for only one crop to be harvested, while irrigation allows a multitude of crops, I believe.

anonymous · Answer

I can't school system has it locked down

anonymous · Answer

Thank you guys

anonymous · Answer

-_- oh this is ur answer  The perennial system allows for the planting of multiple crops while the basin system only allows for the planting of one main crop.

ashleyisakitty · Answer

No problem!
Welcome to Openstudy :)

anonymous · Answer

im 100% sure im a history geek

anonymous · Answer

im giving her a medal 4 asking and yes Welcome to OS