Post on 06-Mar-2018
19 Jan 2011 1
Lqnusujo
Fargo-Moorhead Metropolitan Flood Risk Management Project
US Army Corps of Engineers BUILDING STRONG®
Industry Day - Overview June 27, 2012
Design details are preliminary and may change. The information presented is provided for general
overview and discussion purposes only.
June 2012 2
June 2012 3
Provide quick overview of Project
Intent of Construction Industry Day
Intent of Contracting Seminar
What will happen with the
information provided
What won’t be discussed
Fargo-Moorhead Flood 2009
Welcome
June 2012 4
The Record of Decision signed by the Assistant Secretary of the Army April 3, 2012
Now Congress decides whether to authorize and fund construction of the project
The Corps and Local Sponsors are moving forward with the design phase
Currently designing from the Outlet (near Georgetown, MN) to Maple River, downstream to upstream
Project Status
June 2012 5
Red River Flood Stage = 18 feet on the Fargo gage Exceeded in 48 of the past 109 years Exceeded every year from 1993 through
2011
Catastrophic damages have been prevented by emergency measures 11 disaster declarations since 1989
2009 was the flood of record Stage of 40.8 feet 2-percent chance (50 year) event Emergency measures cost approximately
$70M
Background
June 2012 6
Plan components 20,000 cfs ND diversion channel 50,000 acre feet storage area 150,000 acre feet staging area 35-mile diversion 12 miles of tie-back embankments Control structures on the Red & Wild
Rice rivers Aqueduct & spillway structures on
the Sheyenne & Maple rivers Rock ramp drop structure on the
Lower Rush & Rush rivers Meandering low-flow channel Non-structural mitigation for impacts
in the storage & staging areas
Federally Recommended Plan
June 2012 7
Have started design activities for: Outlet/Design Reach1 Design Reach 2 Design Reach 3 (sponsors) Design Reach 4 Rush River structure Design Reach 5 Lower Rush River structure Design Reach 6 (sponsors) Design Reach 7 (Maple River aqueduct) Environmental mitigation projects
Bridges and associated channel designed by the sponsors CR 31/4, 32, 22, 20 I-29 Hwy 81
Current Design Reaches
June 2012 8
Reach lengths will change depending on future funding and acquisition plan
Construction reaches may differ from design reaches
Alignment from Maple River to Sheyenne River upstream may change
Estimated 55,000,000 cubic yards of excavation (Feasibility Study)
Project Design Reaches
June 2012 9
Outlet/Design Reach 1
June 2012 10
Downstream (north) end of diversion channel
Confluence of Red River to station 225+00
Features Outlet Structure County Drains 29 and 30 Design of local drainage done by
local sponsor
Transportation Re-alignment of County Roads 173rd
Ave SE and 25th St SE Design and construction of bridges
done by local sponsor
Outlet/Design Reach 1
Outlet Structure Plan components
Rock armored drops 1V:50H from low-flow channel to
the invert of Red River Boulder steps: 4-5ft diameter to
create appropriate water depths, resting areas for fish and energy dissipation
June 2012 11
Diversion Channel and Low-Flow Channel FEIS included a
250’ channel Current Plan
300 ft width, 1V:7H side slope up to existing ground
Bottom of channel slopes 2% toward the low-flow channel
Meandering low-flow channel included within the main channel
June 2012 12
Environmental Considerations Meandering low flow channel Planting plan: native wetland species
June 2012 13
Conceptual Section of the Diversion
June 2012 14
Detailed Design Items Ditching
required for lateral drainage
Meandering low flow channel
Excavated Material Berms (EMB) configuration
Recreation
Excavated Material Berms (EMB) and Levees
June 2012 15
Excavated material placed in berms along left and right banks of diversion channel Right Bank:
Embedded levee Recreation Maintenance road
Left Bank:
No levee Maintenance road Drainage inlets
June 2012 16
County Drains 29 & 30
County Drains County Drain 29
Routed to Outlet
County Drain 30 Enters Diversion at station 222+36
on left side of diversion Passes through EMB
June 2012 17
Typical for structures in subsequent reaches (showing Drain 30)
June 2012 18
Lower Rush & Rush Rivers
Lower Rush and Rush Rivers Rock Ramps Plan components
Rock ramp drops followed by riffle pools
5-ft boulders at drops and 15-in rocks in pool areas
Fish passage
Rush rock ramp width of 200-ft Lower Rush rock ramp width of 150-ft
June 2012 19 Rush River Structure
Lower Rush and Rush Rivers Concept
June 2012 20
Schematic of the rock ramp used in the hydraulic analysis
Maple River Sheyenne River
June 2012 21
Maple & Sheyenne Rivers
Maple and Sheyenne Rivers Aqueduct Structures
Plan components Natural river channel will under
under the Diversion channel No gate No operation during flood events Similar to highway overpass Deep foundation Structures possibly heated 250’ span x 50’ width (Feasibility) Cost = $60M (Feasibility)
June 2012 22
Maple River Structure
Maple River Aqueduct Structure
June 2012 23
Aqueduct visualization
June 2012 24
Gated Control Structures Wolverton Creek Control
Structure Red River Control Structure Wild Rick Control Structure
Control Structure
Plan components Operable gates Gates used to limit flow passing
into the cities
Red River structure 182’ wide x 78’ deep (Feasibility) Cost = $61M (Feasibility)
June 2012 25
Red River Control Structure
June 2012 26
Aqueduct visualization Red River Control Structure visualization (gates open - no flooding)
Water Storage Area 1
Plan components Confined by 12 miles of
embankments No gates
June 2012 27
Water Staging Area
Plan components Tie-back embankment running east into Minnesota Overflow embankment running south in North Dakota
Adjacent to CR 17 At a staging elevation of 923.0, 20,000 cfs enters the diversion channel
June 2012 28
June 2012 29
Water Staging Area
Environmental Mitigation Projects Drayton Dam –Fish Passage/biotic connectivity Wild Rice River – Fish Passage/biotic connectivity Buffalo River – River Restoration
Additional mitigation projects may be identified in the future to include: fish passage, riparian forest restoration, floodplain forest restoration
June 2012 30
June 2012 31
Project Location
Drayton Dam Fish Passage Construct new rock ramp fishway structure with sheetpile cutoff 300ft up stream of existing dam
June 2012 32
Drayton Dam, ND Riverside Dam, ND
Existing structure
Drayton Dam Fish Passage
Wild Rice River Fish Passage Construct rock ramp fishway over
existing dam Similar to other Corps fishways on the
Red River, including Riverside Dam in Grand Forks, ND
June 2012 33
Wild Rice Dam, ND
Buffalo River Restoration Restore portions of river to a more natural channel Restore existing river channel in two areas Install rock riffles for grade control Excavate pools behind rock riffles Potentially remove existing road (Junction Ave.)
June 2012 34
Buffalo River, Hawley MN Project Location
Moving Forward Continued analysis to improve overall project by increasing value
and decreasing future risks: Continue to work on technical information Value Engineering studies Examine cost saving measures identified in feasibility study
June 2012 35
June 2012 36
Once authorized and funded by Congress +3 months - Sign Project Partnership Agreement +6 months – Earliest construction start + 8.5 years – Project Operable *
Earliest construction start
Summer 2013
* 8.5 year construction period based on $240 Million/year funding stream
Tentative Project Schedule
June 2012 37
Questions?