On 06/08/2019 12:28, NY wrote:
"Roland Perry" wrote in message
...
"Within the last few years new valves have been placed in the dam to
expedite rapid drawdown in emergencies: presumably, this is happening
now."

Although the question being asked in this thread is "if that's the
case, why also use lots of pumps".

Precisely.

well to state the bleeding obvious having pumps and valves will be quicker.