Much of that water is diverted to grow alfalfa, most of which is used to feed cattle, so that we can eat copious amounts of beef.
This seems a bit alarmist and detached from reality.
> A majority of the water used by farms — and thus much of the river — goes to growing nonessential crops like alfalfa and other grasses that feed cattle for meat production. Much of those grasses are also exported to feed animals in the Middle East and Asia.