Drainage unit having a quilt exterior

摘要

A substantially cylindrical drainage unit for use when buried in soil as part of a wastewater leach field comprises a first plastic aggregate mass that is contained within netting, with an optional central perforated pipe. A segmented quilt comprises the exterior surface of the drainage unit which is in contact with soil. Pebble aggregate that is smaller in particle size than the first aggregate is contained with the cavities of the quilt segments. Quilts having different segment shapes and sizes are manufactured by specialized apparatus which creates rectilinear or serpentine seams.

主权项

1. A drainage unit, for receiving and collecting water when buried in soil or other particulate material, having a length, a diameter, a nominally cylindrical exterior, and opposing ends, comprising: a generally cylindrical mass of first aggregate; and, a quilt made of water permeable geotextile running around all or part of the circumference of said first aggregate mass, the quilt comprised of a multiplicity of interconnected segments, each segment comprising an internal cavity containing a second aggregate, wherein the second aggregate has an average particle size which is smaller than the average particle size of the first aggregate.