Medium Rain's Impact on Twin Buttes?

San Angelo City Councilman Paul Alexander defended his call to pump the South Pool dry with:

"One medium rain, and that lake will fill up overnight." 

Using the same logic, one medium rain will send nearly the equivalent of the South Pool volume through the Equalization Channel to the North Pool.  Let's hope it's overnight.

Update 4-9-12: The Middle Concho raged enough to wash away a pickup truck from someone determined to finish his job. It could've cost the man his life.  Turn around, don't drown.

Update 4-11-12:  No impact on the North Pool at Twin Buttes to date.