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APPENDIX B: GROUND WATER
The following procedure will allow you to temporarily divert water that is encountered in the
ground during draining the pool. Once the liner is installed and the pool is filled, ground water
will not disturb the pool.
1. Begin by excavating a sump in the deep end. A 4'x 4' x 18" deep hole will usually be
large enough. If water is seeping out of the walls of the hopper, cut channels into the
bank to lead the seepage to the pump.
2. Carefully pack the sump pit and channels with 6"-10" of crushed stone. Do not disturb
the surrounding earth. Placing stone too quickly can cause a mud condition which might
plug up the stone and prevent proper drainage.
3. Once the stone is in place, cap the end of a 1 ½" pipe with screen, Drill ¼" holes in the
pipe and place the pipe in the sump at least 6" below the finished height of the stone.
The pipe line should extend from the bottom of the hopper to a convenient location
level. Finish placing the crushed stone in the sump pit and channel until they are full
(approximately 18"). Cover with plastic or burlap prior to finishing the pool bottom to
keep dirt from clogging the stone. In some cases, you may need to use some type of
wire to hold back the stone which you put into the channel.
NOTE: When replacing liners, check to see whether the previous installer has already
installed a drainage system. If yes, continue with step 4.
4. Simply connect the sump line to a ¾ or 1HP, high head, self-priming pump and run the
pump continuously, if necessary, throughout the remaining construction phases to keep
the water level down and the hole dry until the pool is finished. Do not shut the pump
off until the pool is complete and filled with at least 18" of water in the shallow end.
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