The Army Corps of Engineers is a thing... their civil works authority makes them the final authority on water management (changing river flow, dams, anything related to water management.) Not sure about supervolcanos though, couldn't find that on their website.
I am sure that a minimum of the US Geological Survey and ACE will be involved in any supervolcano remediation plan. And probably FEMA but hopefully they won't need to act. ;)
I am sure that a minimum of the US Geological Survey and ACE will be involved in any supervolcano remediation plan. And probably FEMA but hopefully they won't need to act. ;)