It seems like you could build a separate salt water basin that would hold the pumped sea water, so as to avoid having to pump it into Gatun lake. Then the salt

It seems like you could build a separate salt water basin that would hold the pumped sea water, so as to avoid having to pump it into Gatun lake. Then the salt water could be pumped into the locks to supplement the fresh water, when fresh water levels are running low. The pumps could be powered through solar or hydropower.