Carry the prepared piping to the trench. Force the strainer under water until it fills the pipe. If more than 8 feet of pipe is out in the pond, a support bracket behind the strainer is a good idea. Support can be as simple as stacked concrete blocks. The strainer must be above the bottom of the pond so that the strainer holes will not be clogged with mud or other debris.
Proper placement is necessary for successful operation of the dry hydrant.
Backfill around the pipe assembly , starting with the riser, which should be covered during this operation to prevent rock and fill from falling into the pipe. Tamp the dirt for rigid support. Mound the fill material higher for more freeze protection. If extra insulation is needed, install a styrofoam barrier around the pipe 2 to 3 feet under the surface. Cut off the riser so that when you attach the hydrant connection to the riser, the top of the opening of the hydrant connection is lower than the bottom of the pump intake.