1. Calculate the size of the liner needed. To do this, add twice the pond depth to each dimension, then add another two feet minimum. In some conditions some liners will require underlayment. The liner manufacturer will indicate which liners need this protective layer between the liner and certain types of soil. For example, some liners need underlayment for use with rocky soil.

2. Mark the outline with a rope or garden hose.

3. Remove sod, then dig out shelves. Most ponds are designed with shelves 9-12" below water level to hold plants.

4. Dig deep area of pond. Pond sides should slope in about 20 degrees from vertical. Check level of pond bottom with board and spirit level. Using flat spade, cut a ledge around the edge of the pond for edging material. Check edges of hole for level.

5. Prepare the hole for the liner by removing stones or roots and by adding 2-3 inches of sand to the bottom of the hole. If recommended, add fabric underlayment at this point.