7-182 Section 717. Downspouts and Drains
717.01 Description
This work consists of providing and installing deck drains and downspouts, adjusting existing deck drains, extending existing downspouts, and protecting deck drain systems during construction.
717.02 Materials
Provide materials in accordance with the following sections : Drain Castings ...................................................................................... 908 Miscellaneous Metals ............................................................................ 908 Downspouts .......................................................................................... 909 Drain Extensions ................................................................................... 909
717.03 Construction
A.New Construction . Install new drain castings and downspouts at the locations and elevations shown on the plans. For drain casting required to be accessible in accordance with the American with Disabilities Act (ADA), fabricate g rates that comply with
U.S. Access Board ADA Standards for Transportation Facilities , section 302.3. Unless otherwise specified in the contract, orient grates so the long dimension of the elongated openings is perpendicular to the dominant direction of travel and as approved by the Engineer.
B.Adjusting Existing Deck Drains. Adjust existing drain castings and downspouts to the new elevations shown on the plans.
C.Downspout Replacement . Fabricate replacement downspouts with an inside diameter sized to fit the outside of the existing drain casting. Provide a downspout length that extends from the drain casting to 6 inches below the beams . Remove the existing downspout . Attach the replacement downspout to the existing drain casting with four equally spaced, galvanized, ½ -inch-diameter steel cap screws, drilled and tapped into the casting . If the depth of the adjacent beams exceeds 42 inches, install a support bracket.
D.Deck Drain Extension . Fabricate and install deck drain extensions . Center extensions beneath the existing drain opening and fasten directly to the deck.
E.Protecting Deck Drainage Systems. Protect existing deck drains and downspouts during construction. Prevent debris from clogging the deck MDOT Standard Specifications for Construction Section 717 7-183 drains and downspouts . Obtain the Engineer ’s approval for the protection method. Before beginning work on existing bridges, conduct an inspection with the Engineer to determine the condition of deck drains and downspouts . At the completion of the project, clean the deck drains and downspouts to provide free flowing deck drains and downspouts clear of debris at no additional cost to the Department.
717.04 Measurement and Payment
Pay Item Pay Unit Drain Casting, Type __ ............................................................................. Each Drain Casting, Type __, Accessible .......................................................... Each Drain Casting Assembly , Type __ ............................................................. Each Drain Casting Assembly , Type __, Accessible .......................................... Each Deck Drain, Adj ......................................................................................... Each Downspout Replacement .......................................................................... Each Deck Drain, Extension .............................................................................. Each
A.Drain Casting, Type __. The unit price for Drain Casting, Type __ includes the cost of providing and installing the drain casting. Drain Casting, Type __, Accessible. The unit price for Drain Casting , Type __, Accessible includes the cost of providing and installing the drain casting with an ADA accessible grate.
B.Drain Casting Assembly . The unit price for Drain Casting Assembly, Type __ includes the cost of providing and installing the drain casting, downspout and, if nec essary, the lower bracket to the drain casting. Drain Casting Assembly , Type __, Accessible . The unit price for Drain Casting Assembly , Type __, Accessible includes the cost of providing and installing the drain casting with an ADA -accessible grate, downspout and, if necessary, the lower bracket to the drain casting.
C.Deck Drain, Adjust . The unit price for Deck Drain, Adj includes the cost of adjusting the drain casting and downspout.
D.Downspout Replacement . The unit price for Downspout Replacement includes t he costs of the following:
1.Taking field measurements to determine downspout size;
2.Providing hardware to fasten the downspout to the drain casting; and
3.If the depth of the adjacent beams is greater than 42 inches, providing and installing the lower bracket. MDOT Standard Specifications for Construction Section 717 7-184 E. Deck Drain, Extension . The unit price for Deck Drain, Extension includes the cost of providing and installing the deck drain extension.
F.Protecting and Cleaning Deck Drainage Systems. The cost of protecting and cleaning deck drainage systems is included i n the unit prices of other relevant pay items.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 546–548 of 1,146.