How far does a propeller push water?


Hi !
I hope I am in the right forum and get an answer to my query.
We operate a pumping station which pumps sea water to petrochemical plants and a refinery in the Arabian Gulf. Our sea water intake is jutting ~ 500 m into the sea. However, over the last few years sea water temperature is going up which is affecting our customers.
Alternative 1 is to push the water intake further out into the sea but this is a very expensive option.
Alternative 2 is an outrageous suggestion to push colder water towards the water intake from out in the sea using propellers.
Is this an idiotic suggestion ?
If not, can someone share ballpark numbers on how far does a propeller push water ?
If it is a very large propeller, what is a ballpark volume pushed and the cost of the propeller ?