For pond fabric, the required length is maximum length times which combination of depth?

• A. Twice the depth
• B. The depth plus three feet
• C. Three times the depth
• D. Twice the depth plus three feet

Answer: (D)

When sizing pond fabric, you account for wrapping the liner up the depth on both sides and still have extra for overlaps and securing. The correct factor to multiply the maximum length by is twice the depth plus three feet. That means the required length equals maximum length times (2 × depth + 3 ft). The two-fold depth covers both sides rising to depth, and the additional three feet provides enough material for seam allowances, overlaps, and anchoring. The other options miss either the extra length for overlap or use an incorrect combination, so they don’t provide enough material for proper installation.