Managing Low Flow Levels

Year 12 ILA, 30th November/4th December.
What causes low flow in rivers? What effect does it have? What can be done to manage low flow conditions in rivers?
Use this as a STARTING point & make specific reference to case studies.

The 1000 low flow on the Murry-Darling river basin mentioned here might be a good e.g.
Low water levels have been reported on the River Thames since Spring 2007.