(A) Perforated corrugated polyethylene (PE) pipe and fittings shall conform to IDOT Specification 4143.01B. The perforations shall be slots in accordance with AASHTO M 252. Circular perforations will not be allowed.
(B) Subdrain outlets into open ditch sections shall be corrugated steel culvert pipe in accordance with IDOT Specification 4141.01, including tapered ends, when required.
(C) The outlet covering of all subdrain outlets shall be three-eighths-inch mesh, galvanized hardware cloth screen.
(D) See IDOT Instructional Memorandum 443 and 443.01 for approved PE pipe and rodent guard manufacturers and acceptance criteria.