Measure sharp curves and angles at 1’ to 2’ intervals or less. Any obstructions such as ladders, slides, rocks, waterfalls, etc. should be a numbered point. Measure these last after complete all pool points. Any obstructions away from the water’s edge but within the 18” overlap area should be numbered last on the A-B form, not in succession as you measure around the pool’s edge. Be sure to include any steps, ladders, waterfalls or any other non-removable obstruction in your sketch.