This calculator will help you to estimate the cost of operating any
given electrical pump, based on the average KWH (kilowatt hours)
used per day, and on the average cost per KWH charged by your
electric company.
If you live in area with lots of tree coverage, or if you have a tree that loses its leaves during the fall - then you should consider covering your pond with a pond net.
A pond net is easy to install, and can be an effective way to keep your pond from filling up with leaves that just have to be cleaned out in the Spring.