ASTM C4-62 (Reapproved 2004) - Standard Specification for Clay Drain Tile and Perforated Clay Drain Tile
by ASTM, 1/1/2004
This specification establishes the criteria for acceptance, prior to installation, of drain tile and perforated drain tile to be used for underdrainage, filter fields, leaching fields, and similar subdrainage installations.
The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.