Electricity cost to run pond pump/filter 20' x 30' x 2.5'
I purchased a house that has a large hole in the ground that neighbors say was a pond at one time. It's 20' x 30' x 2.5' deep. The pond is at the bottom of a slope above it. What I'd like to do is build a waterfall at the top of the slope about 40' above, a lined rock covered stream from the waterfall down to the pond and have the pump pump the water up to the waterfall from the pond to recirculate it and also have a filter. I'm in a suburb of Seattle/Tacoma Washington.
My question is anyone's rough guess of what the electricity cost would be running a pump/filter that can handle this type of pond/waterfall? I want some guess of this before I undertake the project so I don't do all of this then realize the monthly electricity bill is prohibitively expensive. I'm a total newbie, have never done any kind of water feature before.
I'm leaning toward NOT having any fish in the pond if that affects how much the pump/filter must run per day.