DREDGING FOR BENEFICIAL USE

Transcription

1 DREDGING FOR BENEFICIAL USE Linda S. Lillycrop Program Manager, Regional Sediment Management Program US Army Engineer Research and Development Center PIANC Inland Rivers, Ports and Terminals Annual Conference 25 April 2018 Cincinnati, OH

2 USACE Navigation Mission Provide safe, reliable, efficient, effective & environmentally sustainable waterborne transportation systems for movement of commerce, national security needs, & recreation COASTAL NAVIGATION 1,067 Navigation projects 19 Lock chambers 13,000 Miles of channels 929 Navigation structures 844 Bridges INLAND NAVIGATION 27 Inland River Systems 207 Lock 171 lock sites 12,000 Miles of inland river channels

3 ..Corps dredges over 200 Million yd 3 of sediment annually At a cost of more than $1 Billion per year

4 Sediment Management/BU Goals and Strategies Reduce Offshore/CDF Disposal Bypass Backpass Sediments Reduce Erosion Save Capacity Environmental enhancement Maintain & protect infrastructure Keep sediments in the system Use natural sediment processes Reduce sedimentation Reduce dredging and transport costs Multi-project linkages Stabilize Structures Reduce Sedimentation Ecosystem Habitat Restoration

5 Galveston District Beneficial Use Projects Houston Navigation Channel Atkinson Island marsh Texas City Channel marsh Lower Galveston Bay Sabine-Neches Waterway Bessie Heights Marsh GIWW: Aransas National Wildlife Refuge 1,600 acres of marsh Brazos Island Harbor Beach nourishment, S Padre Island Port Mansfield Channel: Beach nourishment Chocolate Bayou marsh creation Houston Ship Channel: Evia Island 6 acre bird nesting habitat Houston Ship Channel: Bolivar Marsh creation

6 Galveston Bay, TX Dredge approx 2Mcy every months Funding: Channel & Upland Placement Area Maintenance Objectives Reduce sedimentation, increase dredging cycle Save placement area capacity Beneficial Use of sediment Link projects (Channel dredging & Shore protection) Pelican Island PA Galveston Harbor San Jacinto PA Galveston Entrance Channel Stewart Beach East Beach Solutions Sand-tighten jetties: 113,000 cy/yr Prevention of wind-blown sand: 21,000 cy/yr Back-passing plant with spur dikes 150,000 cy/yr Close boat cut in North Jetty: 160,000 cy/yr Place material on beach: 300,000 cy/yr Maximum Possible Savings of ALL alternatives: 744,000 cy/yr ~ $2.8M/yr (based on $4/cy) Sand Fencing/Vegetation Retain Sand ODMDS Contribute to Long-term sustainability of wetlands Coupling mixed-sediment berms w/constructed wetlands Sediment Sustainable Berm

7 Thin Layer Placement of Dredged Sediments - Wetlands Predict response of wetlands to dredged sediment placement - consolidation - settlement - biomass - sediment organic content - carbon sequestration Better design TLP projects - achieve design marsh elevations Advance state of practice - reducing costs - maximizing benefits Provide Guidance Stone Harbor, NJ Avalon, NJ US Army Corps of Green Engineers Engineer andand Development Center Partners: USFWS, NJDEP, TNC, Alliance, MordecaiResearch Land Trust, Stone Harbor Wetlands Institute

8 Fill Brookley Dredge Hole Mobile Bay, AL Sediment Management Strategy WRDA86: Place all dredged sediments in ODMDS Mcy/yr, Hopper Dredge, 40mi Gaillard Island Dauphin Island ODMDS Fill Mined Oyster Holes Thin Layer Placement Cells Sand Island BU 2014 Placement Strategy: $12M annual value Thin Layer Placement (Open Water) Fill dredge holes - Brookley Hole, Oyster Holes Gaillard Island (1981, 31Mcy, 1,300 acres) - Brown Pelican Habitat - Biodegradable Containment - Marsh Creation Sand Island Beneficial Use Area - Dauphin Island Shoreline Erosion - Protect Lighthouse Future in-bay placement: Thin Layer Placement acre emergent marsh

9 Atchafalaya River, LA Horseshoe Bend Island ~85 Acre island enhancement - Channel Maintenance ( Mcy/1-3 yrs) - Strategic Placement - Natural river flow and conveyance to engineer/construct island - Reduced frequency of maintenance dredging - Shortened transit distance - Created diverse habitat - Island used for recreational purposes USACE, USFWS, Port of Morgan City US Army Corps of Engineers Engineer Research and Development Center

10 Inland: Missouri River 2011 Flood Recovery Decatur Bridge Repair BU Shoal material - Control structures - Bank stabilization - Restore wetlands Hamburg Bend Chute Levee BU Shoal material - Revetment Levee Repair - Shallow water habitat creation US Army Corps of Engineers Engineer Research and Development Center

11 Confluence of the Sangamon and Illinois Rivers Environmental Navigation Flood Risk Mgmt Consequences of Channelization & Land Use Impacts Beneficial Use Opportunities Restore Sediment Delivery Downstream Benefits to Navigation, Flood Risk Management, and Environment

12 Solutions to Reduce Sedimentation Utilize Natural Processes for BU Upper Mississippi River Training Structures: Chevrons River Bendway Weirs US Army Corps of Engineers Engineer Research and Development Center

13 Collaboration Federal, non-federal, Stakeholders, Academia, NGOs, Natural Infrastructure Initiative Workshops Opportunities, Decision Making Pilot Projects, Training, Guidance, Documentation US Army Corps of Engineers Engineer Research and Development Center

14 CE-Dredge Decision Support Tool Integrated, Comprehensive Approach for Strategic Dredged Mat l Mgmt Placement Areas: Color Coded By Capacity Navigation Channels: Authorized Dimensions, Stationing Channel Surveys: Display Shoaling Areas Placement Areas: Color Coded By BU or Disposal Type Oil & Gas Leases Sediment Samples Core Borings Oyster Beds Channel Condition Surveys US Army Corps of Engineers Engineer Research and Development Center 2

15 NATURAL INFRASTRUCTURE INITIATIVE Sediment Marketplace: ID Beneficial Use Opportunities Connecting sediment sources to needs Where are the sediment sources? Where are the current placement areas? Where are the restoration, shore protection, and nearshore placement projects? What volume of material was placed? What volume is planned for placement? Where are potential placement sites? What capacity is available? What are upcoming dredging/navigation needs? What are opportunities for new beneficial use? Are there opportunities to link multiple projects? US Army Corps of Engineers Engineer Research and Development Center 2

16 WATER INFRASTRUCTURE IMPROVEMENTS FOR THE NATION ACT (WIIN ACT) 2016 SEC BENEFICIAL USE OF DREDGED MATERIAL USACE establish pilot program for 10 beneficial use of dredged material projects Projects must maximize beneficial placement of dredged material from federal and non-federal navigation channels Ensure use of dredged material is consistent with all applicable environmental laws Project Purposes: 1) providing storm damage reduction; 2) promoting public safety; 3) protecting, restoring, and creating aquatic ecosystem habitats; 4) stabilizing stream systems and enhancing shorelines; 5) promoting recreation; 6) civic improvement; 7) other innovative uses and placement alternatives that produce public economic or environmental benefits US Army Corps of Engineers Engineer Research and Development Center

17 WIIN 1122 Federal Register Notice Soliciting Proposals: 9 Feb 2018 Submittal Deadline: 12 Mar 2018 Regional teams evaluate proposals for eligibility: 30 Apr local USACE subject matter experts - other federal agencies - state and local government agencies HQUSACE board recommends 10 pilot projects 30 June 2018 to Assistant Secretary of the Army for Civil Works (ASACW) ASACW final decision/submits report to Congress *WRDA 2016 is an authorizing document and does not provide appropriations for the execution of the 10 selected pilot projects. Additional guidance on potential funding sources/appropriations for each pilot project will be provided by ASACW/HQ after project selections. US Army Corps of Engineers Engineer Research and Development Center

18 WIIN Proposals (29 States, Puerto Rico) 36 Riverine, 58 Coastal Beach nourishment/coastal restoration Wetlands/marsh creation Storm damage risk reduction Sediment reclamation Construction projects Floodplain restoration Bird habitat Port expansion

19 DREDGING FOR BENEFICIAL USE Thank you! Linda S. Lillycrop

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21 For projects that use material dredged from a federal navigation project, the incremental costs above the Federal Standard for transporting and depositing such dredged material will be borne entirely by the federal government. If pilot projects involve additional activities other than transportation and placement of dredged material, such as wetland plantings or mechanical shaping of dunes and beach berms, those costs shall be shared in accordance with the cost-share requirements of Continuing Authorities Program (CAP) Sec 204. If additional material is dredged from a federal navigation project solely for the purposes of a pilot project, the costs associated with the additional dredging will be cost-shared with the non-federal sponsor in accordance with CAP Sec 204. If a pilot project relies on dredged material from a non-federal project, the dredging and transportation costs will be 100% non-federal; all other costs associated with the project will be cost-shared in accordance with CAP Sec 204. Sec 1122 did not authorize an increase in the funding cap for Sec 204, nor did it provide a funding limit for pilot projects. It only specified that the cost-sharing require follow Sec 204, with the modifications just discussed regarding incremental costs above the Federal Standard.