69OVERSIDE DRAINS

69-1 General

69-1.01 General

69-1.01A Summary

Excavation and backfill must comply with section 19 -3.

69-1.01B Definitions

Reserved

69-1.01C Submittals

Submit a certificate of compliance for each of the following materials:

69-1.01D Quality Assurance

Joints for overside drains must comply with section 61 -2.01D(2)( b) for watertightness.

69-1.02 Materials

69-1.02A General

For alternative pipe downdrain, choose 1 of the types shown. Fabrication of overside drain materials must comply with the details and dimensions shown. If authorized, minor variations may be used to allow the use of the manufacturer's standard jigs and templates during the fabrication. The material thickness must be not less than the thickness described. For pipe downdrains under concret e slope paving, the end of the downdrain must consist of steel pipe or steel conduit. Do not mix steel and aluminum pipe in the same installation. You may use the anchor assemblies shown with an aluminum installation if the anchor assemblies are electrical ly insulated. Plastic pipe and fittings used for overside drains must be from 1 manufacturer for each installation. Welding workmanship and techniques must be equal to the best practice in modern commercial shops.

69-1.02B Steel Pipe Overside Drains

Steel entrance tapers , pipe downdrains, reducers, coupling bands, and slip joints must be fabricated from galvanized steel sheets and must comply with AASHTO M 36 and section 66. The nominal thickness of the sheet must be at least 0.064 inch. The pipe must be Type I pipe under AASHTO M 36. Steel tapered inlets and flume downdrains must be fabricated from steel sheets under section 69 -1.02B. Coupling bands for corrugated steel pipe must comply with either section 69 -1.02B or 61 -2.01D(2)( c) for downdrain pip e. The weight of galvanizing for overside drain materials must comply with ASTM A123/A123M and A153/A153M. Galvanized surfaces on overside drain materials that are damaged must be repaired under section 75 - 1.02B.

69-1.02C Aluminum Pipe Overside Drains

Aluminum entrance tapers , pipe downdrains , reducers, coupling bands, and slip joints must be fabricated of alumi num sheets and comply with AASHTO M 196 and section 66. The nominal thickness of the sheet must be at least 0.060 inch. The pipe must be Type I pipe under AASHTO M 196. SECTION 69 OVERSIDE DRAINS Aluminum tapered inlets and flume down drains must be fabricated of aluminum sheet complying with AASHTO M 197 with a thickness of at least 0.060 inch. Coupling bands for corrugated aluminum pipe must comply with either section 69 -1.02C or 61 -2.01D(2)( c) for do wndrain pipe .

69-1.02D Plastic Pipe Overside Drains

Plastic pipe for overside drains must be Type S corrugated high -density, polyethylene pipe, and comply with section 64. Plastic pipe joints must comply with section 61 -2.01D(2)( c). If pipe joint details are shown, the tensile strength requirements do not apply. The joint overlap requirements for integral joints must comply with the requirements for positive joints .

69-1.02E Anchor Asse mblies

A single anchor assembly includes:

69-1.02F Cable Anchorage System

Cable anchorage systems for pipe downdrains must comply with section 69 -1.02E. Cables, welded steel eyes, steel rods, turnbuckles, thimbles, cable clamps, and anchor plates must comply with specifications for similar materials in section 83 -1.02B. Steel pipe must comply with specifications for pipe posts in section 56 -2.02F. Concrete for concrete anchors must comply with the specifications for minor concrete except the concrete must cont ain at least 420 pounds of cementitious material per cubic yard.

69-1.02G Protective Coatings

If described as coated, metal overside drains must be protected with coating under section 66 -1.02C. If a protective coating is applied to a metal overside drain , each section of the downdrain pipe and each accessory must have the nominal thickness of the metal clearly identified on the inner surface with paint or other authorized means. Repair damaged coatings under section 66 -1.02C.

69-1.03 Construction

Install entrance tapers and tapered inlets so that they function properly and efficiently, keep material in the dike, and prevent water from percolating under or around them. The seal between the taper or inlet and the surrounding material mus t be watertight. Connect an entrance taper to a downdrain pipe by means of a band coupler or a slip joint. Weld or rivet bulkheads and outlet pipes or flume pieces to the taper or inlet to form watertight connections. Securely anchor a downdrain to the slo pe of the ground as shown if the downdrain is not in a trench. Cable must not contact soil in finished position. Either adjust position or replace affected portion of cable with galvanized steel rod of equivalent diameter. If a plastic pipe joint restraine r assembly under Alternative A is used, install it immediately below the pipe bell. The bell end of a plastic pipe overside drain must face uphill. SECTION 69 OVERSIDE DRAINS

69-1.04 Payment

The payment quantity for pipe downdrain is measured along the centerline of the pipe and parallel with the slope line. The payment quantity includes the length of elbows, wyes, tees, and other branches to the point of intersection. If the pipe is cut to fit a structure or slope, the payment quantity is the length of pipe necessary to be placed before cutting, measured in 2 -foot increments. Payment for the length of slip joints is not included in the payment for pipe downdrain. The payment quantity for pipe downdrains under concrete slope paving is measured from the beginning of the corrugated s teel pipe to the end of the downdrain. The payment quantity for an entrance taper includes the length of the tapered section and the tail pipe. The payment quantity for a tapered inlet includes the length of the tapered section and the flume stub.

69-2 69-10 Reserved