No power to new GFCI
This is EXACTLY what GFCI is for
GFCI was created to handle exactly these types of situations. A properly functioning GFCI cuts off power when there is a ground fault, such as contact between power conductors and water, fast enough to prevent injury or death.
That being said, you should always be careful with any electric devices around water. Sometimes, as many questions on this site have shown, GFCI and other protective devices are not installed properly or fail for other reasons.
Does it reset?
Every GFCI has Test &amp; Reset buttons. Does it reset? If it doesn't reset then either it still thinks there is a fault, or it is damaged.
Check the wiring and look for ANOTHER GFCI
If the GFCI is the only one on the circuit, then every receptacle (except the one that is together with the GFCI) is either before or after the GFCI. Every receptacle after the GFCI has the same protection as the GFCI receptacle itself, but that means a ground fault on any of those receptacles (or any equipment attached to them) will prevent the GFCI from being reset.
So check any receptacles that are on the same circuit. Unplug everything plugged into them, even if you think they have nothing to do with the problem, and try to reset the GFCI again.
Also look for any additional GFCI units. Sometimes there is more than one on a circuit, even though that is not necessary if wired correctly. The circuit breaker in the panel may also have GFCI built in to it, which protects the entire circuit. When a fault occurs, any combination of GFCIs in the circuit between the panel and the location of the fault may trip - with no guarantee of sequence. You could have a breaker plus two receptacle GFCIs and have the breaker plus one receptacle trip...any combination is possible.
Other damage?
With &quot;traditional&quot; short circuits, so much current can flow so fast that wire connections, switches, etc. can burn up or weld together before the circuit breaker trips. That should not be the case with a GFCI ground fault trip, but anything is possible. So if you rule out additional GFCIs and other ground faults then you need to check every receptacle and wire connection in the circuit to look for burn damage, faulty back stab connections or other problems.