Backfill with Drainage Gravel

What happens here

Workers use shovels to backfill the trench with a generous layer of drainage gravel, typically washed stone. The gravel is carefully poured over the lined pipes, completely encasing them. This gravel layer serves multiple purposes: it helps filter larger debris from the water, allows water to easily percolate down to the pipes, and protects the fabric-wrapped pipe system. The geotextile fabric is often folded over the top of the gravel before final backfill with soil (not fully shown in video) to completely enclose the drainage aggregate.

Goal: The final step shown involves backfilling the trench with drainage gravel, which surrounds the pipes and helps filter water before it enters the system.