When installing filter fabric over and under perforated pipes to keep soil from plugging the holes, with adjacent rolls overlapped by 18 inches and gravel along the fabric edges to prevent wind, you have proceeded:

When installing filter fabric over and under perforated pipes to keep soil from plugging the holes, with adjacent rolls overlapped by 18 inches and gravel along the fabric edges to prevent wind, you have proceeded:

• A. Correctly
• B. Incorrectly
• C. Partially
• D. Not specified

Answer: (A)

Using filter fabric to wrap around perforated drainage pipe is standard to keep fines from clogging the holes while still allowing water to pass. Wrapping fabric over and under the pipe creates a continuous barrier on both sides, so soil particles can’t enter the perforations from any direction. An 18-inch overlap of adjacent fabric rolls ensures there are no seams that could admit sediment, maintaining a continuous protective layer across the trench. Placing gravel along the fabric edges helps weigh the fabric down to resist wind uplift and movement, and it provides a coarse drainage medium at the margins so water can flow freely without exposing the fabric to displacement. Together, these steps keep the drainage path clear and stable over time, which is why proceeding as described is correct.

Using filter fabric to wrap around perforated drainage pipe is standard to keep fines from clogging the holes while still allowing water to pass. Wrapping fabric over and under the pipe creates a continuous barrier on both sides, so soil particles can’t enter the perforations from any direction. An 18-inch overlap of adjacent fabric rolls ensures there are no seams that could admit sediment, maintaining a continuous protective layer across the trench. Placing gravel along the fabric edges helps weigh the fabric down to resist wind uplift and movement, and it provides a coarse drainage medium at the margins so water can flow freely without exposing the fabric to displacement. Together, these steps keep the drainage path clear and stable over time, which is why proceeding as described is correct.