Gravelless pipe definition
Gravelless pipe means large diameter perforated piping encased in a synthetic filter material and designed for use in a lateral field trench without trench rock or gravel fill material.
Gravelless pipe means large diameter perforated piping designed for use in lateral field trenches without the use of trench rock or gravel fill material. Such pipe includes a mandatory overwrap or encasing of synthetic filter material meeting specific criteria.