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Title: Continuing Authorities Program, Section 14, Emergency Streambank and Shoreline protection, James River Shoreline, Newport News, Virginia : Final Integrated Feasibility Report/Environmental Assessment
Authors: United States. Army. Corps of Engineers. Norfolk District.
Keywords: Erosion
Environmental management
Environmental protection
Newport News (Va.)
James River (Va.)
Publisher: United States. Army. Corps of Engineers. Norfolk District.
Abstract: The U.S. Army Corps of Engineers, Norfolk District initiated this study in May 2015 at the request of the non-federal sponsor, the City of Newport News, Virginia. The study authority is Section 14 of the Flood Control Act of 1946 as amended, for Emergency Streambank Restoration under the Continuing Authorities Program (CAP). An approximate 600-foot section of the riverbank along the James River is severely eroded by the combined effects of natural erosion processes; river flow, relative sea level rise, and tidal, storm, and wind driven wave action. The resulting 25-foot high receding sandy bluff results in a continuing loss of land and is an imminent threat to existing public facilities and utilities, including River Road, electric, gas, communications, public water and sewer lines, as well as creating dangerous conditions associated with the steep eroding slope. CAP Section 14 feasibility studies must evaluate whether it would be more cost effective to relocate the public facilities so that they would no longer be at risk from the streambank erosion or stabilize the shoreline to reduce the risk to the facilities where they are currently located. This report identifies the alternatives that were considered to address this problem and recommends bank stabilization by rock sill with vegetated slope as the plan that would best meet the study objectives and protect the public facilities at risk. During the feasibility phase, there were four action alternatives considered, including rock sill with vegetative slope, full rock revetment, partial rock revetment with vegetative slope, and living shoreline with vegetative slope. Alternative 1 (the Recommended Plan) is the least cost option at an estimated July 2021 project first cost of $3,481,000 and would stabilize the streambank with a rock sill and vegetated slope. This plan includes a longitudinal rock sill running the length of the project area, earthen slope berm graded on a 1 Vertical to 3 Horizontal (1V:3H), 2900 tons of VDOT class III riprap, 800 tons of VDOT number 1 stone, 4300 cubic yards of fill, 1600 square yards of geotextile filter fabric, 35,000 square feet of seeding, and 700 cubic yards of debris removal. At the estimated project first cost of $3,481,000, the estimated federal cost- share (65%) is 2,262,650 and the estimated non-federal cost-share (35%) is $1,218,350. This report provides the basis for preparing plans and specifications for the subsequent construction of the Recommended Plan.
Description: Integrated Feasibility Report and Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Size: 623 pages / 62.74 MB
Types of Materials: PDF/A
Appears in Collections:Environmental Documents

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