284 ALASKA 2020 DIVISION 600 –MISCELLANEOUS CONSTRUCTION SECTION 601 METAL FLUME DOWNDRAI NS
601-1.01 DESCRIPTION. Furnish and install tapered inlet assemblies, metal flume downdrains,
and anchor assemblies, at the locations shown on the Plans.
601-2.01 MATERIALS. Fabricate tapered inlets and flume downdrains using any one of the base
metals listed in AASHTO M 36 or AASHTO M 196. Use a minimum sheet thickness of 0.060 inches. Use steel nuts and bolts, galvanized acc ording to AASHTO M 232.
601-3.01 CONSTRUCTIO N REQUIREMENTS. Fabricate downdrains according to the details
and dimensions shown on the Plans. Weld bulkheads and flume pieces to the inlet assembly to form watertight connections. Do not use dissimilar metal at any one installation. Anchor assemblies shown on the Plans may be used with an aluminum installation if the anchor assemblies are electrically insulated. Connect flume downdrain sections together and to the inlet assembly using galvanized bolts as show n on the Plans.
601-4.01 METHOD OF M EASUREMENT. See Section 109, measured along the invert from the
lower end of the inlet assembly, not including flume stub, to the lower end of the flume.
601-5.01 BASIS OF PA YMENT. The contract price includes the inlet, anchor assemblies,
miscellaneous hardware, and excavation for the installation. Payment will be made under: PAY ITEM Item Number Item Description Unit 601.0001.____ Metal Flume Downdrain LF