Step 1: Establish the A-B Line Run a straight A-B line parallel to the pool, at least 4 feet from the water's edge and at least two-thirds the length of the pool. Point A must be to the left of point B. Measure the full A-B line and record it on your A-B measuring sheet. The example line is 20 feet long. Draw your A-B line along the bottom of the pool sketch.
Step 2: Mark the Pool Perimeter Use chalk to mark points at the water’s edge. The spacing does not need to be even: place marks about 2 to 3 feet apart on moderate curves and about 1 foot apart on tight curves. On straight sections, place marks at corners or wherever the pool changes direction.
Step 3: Number Every Point Clockwise Start near the center of the A-B line and number every chalk mark in a clockwise direction. Continue until every point around the pool has a unique number.
Step 4a: Measure from Point A Have an assistant hold the end of the tape at point A. Working clockwise, measure from A to every numbered perimeter point and record each distance on the A-B measuring sheet.
Step 4b: Measure from Point B Move the tape to point B. Working clockwise again, measure from B to every numbered perimeter point and record each distance beside the matching A measurement.
Step 5: Add Cross-Check Dimensions Add 2 or 3 diagonal measurements between numbered points and record them on the A-B measuring sheet. Also mark stairs, rocks, walls, or other deck features within 2 feet of the water's edge so we can account for possible cover interference.