SECTION 715 — GABION CHECK DAM 700-39 — GABION CHECK DAM
715.01 Description.
This of work consists of the construction of a gabion check dam in the required dimension, details and materials.
715.02 Materials.
Use gabions that have been fabricated, assembled, and installed according to the Contract. Provide basket units as specified with a dimension tolerance of plus or minus 5 percent and that conform to ASTM A-974-97 and US Federal Specification QQ-W-461H and that have been coated according to ASTM A641, Class 3, Finish 5, soft tempter. Use wire for basket units that has been hot-dipped galvanized steel and that has a minimum tensile strength of 60,000 psi. Ensure that the gabions have mesh openings with nominal dimensions not to exceed 4.5 in. and that the maximum area of any mesh openings does not exceed 10 sq in. Ensure that the welded wire mesh has a uniform square or rectangular pattern with a resistance weld at each connection and that each welded connection has a minimum shear that complies with ASTM A185. Use a twisted wire mesh that has a non-raveling, double twisted hexagonal wire mesh two twisted together in three 180i-degree turns Ensure that the wire for gabions has been fabricated from wire having the following minimum diameters: Type of Wire Diameter after Galvanization Mesh Wire 0.105 in. Selvedge Wire 0.132 in. Spiral Binders, Lacing Wire, or Internal Connecting Wire 0.086 in. Submit any proposed alternative gabion wire coating to the Engineer for approval. Use riprap gabion check dams that is R-3 minimum. Ensure that c rushed stone has been clean washed and conforms to the gradation listed in Subsection M01.09, Column II of the Table. Use filter fabric that is a non-woven material and conforms to Subsection 703.02.2 and is listed on the RIDOT Approved Materials List.
715.03 Construction Methods.
Excavate the subgrade for the gabion check dam to the required line and grade. Remove a ny buried debris protruding from the subgrade that will impede the proper installation and final
Part 700 — Drainage and Selected Utility Accessories August 2025
700-40 SECTION 715 — GABION CHECK DAM appearance of the gabion check dam, and backfill the voids to provide a level subgrade. Upon inspection and approval of the subgrade by the Engineer, install filter fabric and crushed stone bedding in preparation for placement of the gabions. Place the gabions according to the Contract and/or per the manufacturer’s recommendations as approved by the Engineer. Anchor the check dams into side slopes by extending the ends a sufficient length, height, and depth to prevent flow bypass as required. Extend the side slope anchor length a minimum of 8 in. on each end. Provide Shop D rawings and any necessary documentation for the gabion check dam. The Engineer must approve all materials to be used with the gabion check dam 14 days before being transported onsite.
715.04 Method of Measurement.
Gabion Check Dam will be measured by the number of cubic yards installed.
715.05 Basis of Payment.
The Department will pay for the completed and accepted quantities as follows. Pay Item Pay Unit Gabion Check Dam CY The price constitutes full compensation for all labor, materials, and equipment ; excavation, filter fabric and crushed stone; providing and installing the wire mesh gabions, riprap inside the gabions, fasteners, connection wires and ties; and all other incidentals required to finish the work, complete and accepted.
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