Fargo Flood Control

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Fargo Flood Control Southside
Flood Protection Chrisan East Subdivision
Public Meeting June 30, 2008
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Fargo
Moorhead
Interstate 29
Rose Coulee
Frontier
25th Street South
Red River
Cass Co Hwy 81
Wild Rice River
1997 Spring Flood South of Fargo
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Fargo
Interstate Hwy 94
West Fargo
Southside Flood Control
Moorhead
Preliminary 100 Year Floodplain
Horace
Interstate Hwy 29
Oxbow
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Fargo
Interstate Hwy 94
West Fargo
Southside Flood Control
Moorhead
After Project Preliminary 100 Year
Floodplain With Internal 100 Year Floodplain
Horace
Interstate Hwy 29
Oxbow
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Southside Flood Control

• Provide Protection from overland flooding that
  threatens the majority of properties south of
  I-94.
• Prevent extensive expansion of South Fargo
  Floodplain and mandatory flood insurance
  requirement.
• Provide growth area for Fargo, helping to keep
  our regions economy healthy

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Project Flood Control Methods

• FEMA levees with and without diversion channels
• Channel extensions
• (Red River drain improvements)
• Storage inside of project
• Storage in upstream watershed

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Southside Flood Control
STORAGE SUMMARY Existing effective storage
6,000 Acre-Ft Base project 0
Acre-Ft Channel extension/storage 2,000
Acre-Ft Supplemental storage 4,000
Acre-Ft Upstream dams 75,000 Acre-Ft (External
storage)
STORAGE
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• Typical Chrisan East - 4,500-5,000/home
• 150-200K (Approximately 1 ac)

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Southside Flood Control
Wild Rice Levee Option Including Mini-Bypass
Alternative
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Southside Flood Control
Levees east of Cass Co. Hwy 81
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76th Avenue
Cass Co Hwy 81
1997 Spring Flood South of Fargo
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West Fargo
Fargo
Southside Flood Control
Chrisan East - Existing 100 yr Floodplain
Horace
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West Fargo
Fargo
Southside Flood Control
Chrisan East - Preliminary 100 yr Floodplain
Horace
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West Fargo
Fargo
Southside Flood Control
Chrisan East Existing and Preliminary 100
yr Floodplains
Horace
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Chrisan East Subdivision Options Considered

• Option 1A/B/C River Side Permanent Protection
  Options
• Option 2A/2B Basic Protection

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Chrisan East Subdivision

• Option 1A Chrisan East Permanent FW
• Components
• Permanent Floodwall (BFE5)
• Openings at Each Property
• Earthen Levee (BFE4)
• 5 Property Acquisition
• Prelim. Geotechnical Completed

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Option 1A - Cost Estimate

• Construction 3.78M
• Real Estate 1.66M
• Total Project Cost 5.44M
• Total Number of Homes Protected 27
• Total Cost of Protection / Home - 201,600

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Option 1A - Potential Share Cost

• 50 State 2.72M
• 25 City of Fargo - 1.36M
• 25 Chrisan East - 1.36M
• Chrisan Cost Share per Home 50,400
• Approx. SE Cass Assessment
• (1.0 acre/150-200K Assessed Value)
• 4,500-5,000

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Chrisan East Floodplain Comparison
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• Example Wall Concepts
• Option A Prairie Style

• Option B Simulated Brick and Cedar Fence

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Floodwall Example
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Option 1A Flythrough
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Option 1A Chrisan East Permanent FW
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Option 1A Chrisan East Permanent FW
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Option 1A Chrisan East Permanent FW
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Option 1A Chrisan East Permanent FW
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Option 1A Chrisan East Permanent FW
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Option 1A Chrisan East Permanent FW
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Chrisan East Subdivision

• Option 1B Chrisan East Permanent FW
• Components
• Permanent Floodwall (BFE5)
• Openings at Each Property
• Earthen Levee (BFE4)
• 5 Property Acquisitions
• Ave. Height 9 ft

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Option 1B Cost Estimate

• Construction 2.26M
• Real Estate 1.87M
• Total Project Cost 4.13M
• Total Number of Homes Protected 27
• Total Cost of Protection / Home - 153,000

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Option 1B Potential Share Cost

• 50 State 2.06M
• 25 City of Fargo - 1.03M
• 25 Chrisan East - 1.03M
• Chrisan Cost Share per Home 38,200
• Approx. SE Cass Assessment
• (1.0 acre/150-200K Assessed Value)
• 4,500-5,000

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Option 1B Flythrough
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Chrisan East Subdivision

• Option 1C Chrisan East Permanent FW
• Components
• Permanent Floodwall (BFE5)
• Permanent Floodwall Built in Front of 5
  Properties.
• Openings at Each Property
• Earthen Levee (BFE4)
• 0 Property Acquisitions
• Potential Slope Issues

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Option 1C Cost Estimate

• Construction 3.28M
• Real Estate 396K
• Total Project Cost 3.68M
• Total Number of Homes Protected 27
• Total Cost of Protection / Home - 136,200

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Option 1C Potential Share Cost

• 50 State 1.84M
• 25 City of Fargo - 0.92M
• 25 Chrisan East - 0.92M
• Chrisan Cost Share per Home 34,000
• Approx. SE Cass Assessment
• (1.0 acre/150-200K Assessed Value)
• 4,500-5,000

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Basic Protection Options
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Chrisan East Subdivision

• Option 2A Partial Protection, Sandbag Plan
• Components
• Earthen Levee (BFE4)
• Sandbag Protection
  (BFE0.6, Elev. 909.0)
• Ave. Height Levee 6.1 ft

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Option 2A Cost Estimate

• Construction 139K
• Real Estate 56K
• Total Project Cost 195K
• Total Number of Homes Protected 32
• Total Cost of Protection / Home - 6,100
• No SE Cass Assessment Option

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Chrisan East Subdivision

• Option 2B Partial Protection, Road Raise and
  Sandbag Plan
• Components
• Earthen Levee (BFE4)
• Chrisan Blvd. Road Raise (BFE0.6, Elev. 909.0)
• Sandbag Protection
  (BFE0.6, Elev. 909.0)
• Ave. Height Levee 6.1 ft

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Option 2B Cost Estimate

• Construction 1.86M
• Real Estate 56K
• Total Project Cost 1.92M
• Total Number of Homes Protected 32
• Total Cost of Protection / Home - 59,800
• No SE Cass Assessment Option

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Chrisan East Subdivision
Cost Estimate
Approx. SE Cass Assessment (2.0 acre/200K)
4,500-5,000
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Additional Issues / Next Steps

• Wall Heights
• Additional Geotechnical Needs
• Other Options Considered

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Additional Issues

• Wall Heights
• NE Wall Section 9-12ft (BFE5)

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Additional Issues

• Wall Heights
• NE Wall Section 9-12ft (BFE5)
• Grand Forks Examples

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Grand Forks Examples
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Additional Issues

• Wall Heights
• NE Wall Section 9-12ft (BFE5)
• Grand Forks Examples
• River Drive Removable Option

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Option 1 - River Side Permanent FW
Option 2A/2B - River Side Combination FW
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Additional Issues

• Wall Heights
• NE Wall Section 9-12ft (BFE5)
• Grand Forks Examples
• River Drive Removable Option
• BFE 3 Option (Wall heights 7-10ft)

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9.7
10.3
9.7
9.1
8.7
8.9
7.2
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Additional Issues

• Additional Geotechnical Needs
• Assumed Soil Parameters
• Existing Conditions Stability
• South End (Option 1C)
• Additional Field Work

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South End Option 1C
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Additional Issues / Next Steps

• Other Options Considered
• Rapid deployment
• 30-320/lf
• Level Surface
• Cleanup

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Additional Issues / Next Steps

• Other Options Considered
• Flood proofing
• 90-100K / per home
• Does not remove need for interior protection
• Additional Acquisitions
• Floodwall costs
• Permanent FW
• Removable FW Opening
• Drainage Outlets
• Site Restoration
• Example 150ft lot 10-ft high
• 300-315K (Construction only)
• Assessed Values - 150-175K

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Project Schedule
Development of options east of University Drive April-June 2008
City Commission Selection of preferred base alternative July 14, 2008
Public input meetings April 15 - August 2008
Environmental Assessment July December 2008
Consultant Selection July - August 2008
Begin Design August 2008
CLOMR Submittal July September 2008
CLOMR Approval December 2008
ROW Acquisitions September 2008 October 2009
Permitting September 2008 April 2009
Special Assessment District September December 2008
Begin Construction June 2009
Functional Completion March 2011
Final Completion July 2012
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Southside Flood Control
Wild Rice River Levee Alternative
Base Project w/ Alternatives
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Chrisan East Floodplain Comparison
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Southside Flood Control
Comment Sheet
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Southside Flood Control
Questions / Discussion
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Assessed Value / Lot Size