A fountain designed to stray a column of water 7 m into the air has a 2 cm diameter nozzle at ground level. The water pump is 2.6 m below the ground. The pipe to the nozzle has a diameter of 4 cm. Find the necessary pump pressure.

the pond is a few months old, size about 8 foot by 4 foot, 2 foot deep. the pump is both fountain and waterfall and on all the time. I have a lily in and a small plant from a local stream. no expensive fish, just a goldfish which i hope to add about 3 more to. water very cloudy, can’t see much below surface.