577Metal Drain Inlets

577.1 General Description

This work includes installing metal drain inlets according to the specifications and plan details. On Projects where the grading and paving are let simultaneously, the Item will be designated as Metal Drain Inlets— Complete Assembly. For this type of construction, complete the Work in two stages. Perform Stage 1 Construction immediately after completing an embankment. Perform Stage 2 Construction progressively as the paved shoulders are completed. On grading Projects where no paving is involved, limit the installations to Stage 1 Construction. On paving Projects where the grading has been completed and metal drain inlets are in place under Stage 1 Construction, complete each assembly as specified under Stage 2 Construction.

577.1.01 Definitions

General Provisions 101 through 150.

577.1.02 Related References

A. Standard Specifications Section 400—Hot Mix Asphalt Concrete Construction Section 436—Asphaltic Concrete Curb Section 441—Miscellaneous Concrete Section 576—Slope Drain Pipe Section 603—Rip Rap Section 645—Repair of Galvanized Coatings Section 844—Steel Pipe B. Referenced Documents General Provisions 101 through 150.

577.1.03 Submittals

General Provisions 101 through 150.

577.2 Materials

Ensure that materials meet the requirements of the following specifications: Material Specification Concrete Aprons 441 Sand-Cement Bag Rip Rap 603 Slope Drain Pipe 576 Asphaltic Concrete Curb 436 Metal Sheeting and Spelter Coating 844.2.03 For asphaltic concrete spillways, use the mixture for asphaltic concrete curb.

577.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

577.3 Construction Requirements

577.3.01 Personnel

General Provisions 101 through 150.

577.3.02 Equipment

General Provisions 101 through 150.

577.3.03 Preparation

General Provisions 101 through 150.

577.3.04 Fabrication

Fabricate metal inlets as integral units to the shape and dimensions shown on the plans. The end section and reducer shall not be corrugated or perforated.

577.3.05 Construction

Install metal inlet drainage assemblies at locations shown on the plans or where directed by the Engineer. Locate inlets to avoid future installations such as guard rail posts and lighting standards. A. Repair Repair damaged galvanized coating according to Section 645. B. Stage Construction On combination grading and paving projects, install metal drain inlet assemblies in two construction stages as follows: 1. Stage 1 Construction As soon as the initial grading of an embankment is completed: a. Install metal drain inlets where shown on the plans or as directed by the Engineer. Each installation includes: • Metal inlet • Necessary slope drain pipe • Concrete aprons or rip rap as required by the Engineer, to control erosion at the outlet end b. To direct the water to the inlets, crown the roadbed and construct a roll of embankment material at the shoulder line. Protect and maintain this drainage system to prevent leakage, erosion, and scouring. Keep gutters, pipes, and inlets open. 2. Stage 2 Construction Complete this second stage operation immediately after paving shoulders to provide a complete drainage installation and prevent erosion of the embankment slopes. As soon as a section of paved shoulder is completed: a. Remove each adjacent inlet from its position placed under Stage 1 Construction and place it in its final position as shown on the Plans. b. Field cut a section of slope drain pipe to the required length to connect the existing slope drain pipe to the metal inlet in its new position. c. Thoroughly compact the embankment material around the inlet, including the subgrade under the asphaltic concrete spillway. Finish to a smooth, firm surface. d. Place the asphaltic concrete mixture for the spillway on the prepared subgrade within the temperature limits set by the Engineer. Thoroughly compact by rolling. Use a hand-operated roller weighing 300 lbs. (135 kg) or more or a small power roller satisfactory to the Engineer. When areas cannot be reached with rollers, compact them with vibratory tampers or hand tampers approved by the Engineer. e. After compaction, ensure that the surface and texture is smooth, even, and dense. Shape and complete the shoulders and slopes to conform to the required finished section. f. As soon as each drainage assembly is completed, place the asphaltic curb at the edge of the paved shoulder and connect it to the inlet as shown on the plans. 3. Metal Drain Inlet Complete assembly construction of each metal drain inlet shall include both Stage 1 Construction and the Stage 2 Construction specified above.

577.3.06 Quality Acceptance

General Provisions 101 through 150.

577.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

577.4 Measurement

Each of the three different types of metal drain inlet installations is measured separately for payment, complete in place and accepted. In each instance, the 2 ft. (600 mm) section of corrugated pipe (which is an integral part of each Unit) is included in the measurement. Measurement of each Metal Drain Inlet—Complete Assembly and each Metal Drain Inlet—Stage 2 Construction includes the asphaltic concrete spillway and the portion of asphaltic concrete curb included, within the limits of each inlet assembly, as shown on the Plans. Measurement of each Metal Drain Inlet—Stage 1 Construction includes the integral drain unit and rip rap, earth roll, or other incidental construction necessary to direct water into the Inlet. Other items of construction required in the work and eligible for payment such as slope drain pipe, asphaltic concrete curb, rip rap, and concrete aprons are measured for payment according to the applicable specification for such items.

577.4.01 Limits

General Provisions 101 through 150.

577.5 Payment

Each of the three types of metal drain inlet installation, measured for payment as described above, will be paid for at the Contract Unit Price per each. Payment of each Metal Drain Inlet—Complete Assembly will include both the First Stage and Second Stage Construction outlined above. When First Stage Construction is completed and the installation is satisfactory to the Engineer, 50 percent of the bid price for each such Unit will be included for payment on the next statement. When the Second Stage Construction is completed and the installation is satisfactory to the Engineer, the remaining 50 percent of the Bid Price for each Unit will be included for payment on the next statement. All other Items needed to complete the installation and that are eligible for payment will be paid for according to the applicable specification for such items. Payment will be made under: Item No. 577 Metal drain inlet—complete assembly Per each Item No. 577 Metal drain inlet—stage 1 construction Per each Item No. 577 Metal drain Inlet—stage 2 construction Per each

577.5.01 Adjustments

General Provisions 101 through 150.

Metal Drain Inlets in other states

• Wyoming 610 · Metal Drain Inlets