hamilton drain flood control improvement project · –generates ~$140,000 per year –last major...
TRANSCRIPT
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HAMILTON DRAIN FLOOD CONTROL IMPROVEMENT PROJECT
POLK COUNTY
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• Add map of watershed…from BP report
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Background
• Frequent Flooding– Low lying– Flat grades– Drainage from early 1900’s– Urbanized– System undersized
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Background
• 1975 Engineering Study– Large storm sewer system– In excess of $16 million (1975)– Too expensive
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Background
• Studies – 1980’s– Focus on regional
detention• Culverts• Storm sewers• Channel improvements
– Lower cost
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Total Cost: $14,400,000 – 1985
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Background
• How to Finance?• Storm Water Assessment
– Implemented 1988– Polk County & City of Des Moines
• Improvements• Maintenance• Numerous projects completed
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Background
• Storm Water Assessment– Generates ~$140,000 per year– Last major improvement 1996– Fund balance: $1.4 million (2009)– $10+ million remaining– Need additional funding
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FEMA HMGP
• Hazard Mitigation Grant Program– 2008 Iowa floods– Presidential disaster declaration– 2009 - $250 million for Iowa
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FEMA HMGP
• Purpose– Mitigate loss of life and property from future
disasters.• Types of Projects
– Safe rooms for schools & communities– Buy-outs for frequently flooded properties– Structure elevation– Flood mitigation
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FEMA HMGP
• Eligibility– Local Hazard Mitigation Plan (funding
available)– Mitigate a known hazard– Cost effective
• Project Costs– Federal: 75%– State: 10%– Local: 15%
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Hamilton HMGP Application
• Notice of Intent – May 2009• Needs were well documented• Improvements identified in County’s
hazard mitigation plan• Matching funds available• Cost Effective
– Benefit / Cost Ratio?
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Benefit Cost Analysis
• Residential / Business Losses– Records are difficult to obtain
• Lost or not kept• Damaged in another flood• New owners• Not always cooperative• Time consuming to pursue
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Benefit Cost Analysis
• Loss of service– Water– Sewer– Power
• No records• Record of Septic Backups
– Septic not allowed
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Benefit Cost Analysis
• Roadway Flooding• Costs to the County
– Flood damage to County infrastructure• Road damage• Shoulders• Debris • Cleanup• Overtime
– County had record of costs– Costs were minimal compared to project
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Benefit Cost Analysis
• Roadway Flooding• Costs to the Public
– FEMA considers cost of detour• Mileage• Time
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Benefit Cost Analysis
• Roadway Flooding– Polk County had excellent records– Numerous roads impacted– Frequent closures– Some higher volume roads affected
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Benefit Cost Analysis
• Roadway Flooding– Detour length– Detour time– Current traffic volumes– Calculate past cost to public
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Benefit Cost Analysis
• Projected Future Cost– Frequency of closure– Obtained hourly rainfall data– Determined recurrence interval
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Benefit Cost Analysis
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Benefit Cost Analysis
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Benefit Cost Analysis
• B / C Calculation– Challenges with BCA
software– Assistance from
Homeland– Cost: $12,500,000– Benefits: $16,000,000– Finally…Success!!!
– 6 months for application
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FEMA Approval
• FEMA Concerns– Environmental– Effectiveness of Improvements– Review Studies
• Project separated into two phases
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Phase 1
• Preliminary design• Phase 1 Environmental• Cultural resources• No wetland delineation• No survey
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Phase 1
• Environmental & Cultural Resources– No significant issues
• Bats• Wetlands…
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Phase 1
• Preliminary Design– Relied on original studies– Confirmed basin sizes– Accounted for development– 6 basins & misc improvements– Estimated cost: $13.5 million– Submitted report Sept. 2011 (2 ½ yr. from
NOI)
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Phase 1
• FEMA– 1980’s studies outdated– Throw them out– Model existing conditions to confirm road
flooding– Confirm recommendations of studies
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Phase 1
• Developed Hydraulic Model– XPSWMM-2D– Modeled each street flooding location
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Phase 1
• Hydraulic Modeling Results– Verified street flooding– Corresponded to County records– Eliminated 2 ineffective basins– Reduced cost to $10 million
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Phase 1
• Submitted Revised Phase 1– April 2012 (3 years)
• Various RFI’s• EA review & comment period• FEMA: Wetland concerns• Wait…
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March 2013
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Phase 2
• Approved: March 2013 (4 years)– Final Design– Property Acquisition– Wetlands– Build it– 36 months
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Phase 2
• Final Design– Straightforward– 4 Regional Detention Basins– Storm improvements
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Phase 2
• Property Acquisition– 30 parcels impacted– $2.5 million+– Eminent Domain for 2 properties
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Phase 2
• Wetlands– Minor impacts on 3 basins– Basin 1: 7.9 acres
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Phase 2
• Wetlands– Basins 2A, 2B, & 3
• Corps: Jurisdictional• Mitigate
– Basin 1• Uncertainty
– Let project…still no decision
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Phase 2
• Wetlands – Basin 1– Wetland Credits – Limited Availability– Going Fast– Polk County purchased 15.4 credits from
Voas Wetland Bank– 2 weeks later…Corps: Non-jurisdictional
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Phase 2
• Basin 1– Flat grades– Couldn’t get area to drain– Wet basin– Design Details:
• Drainage Area: 340 ac.• Basin Area: 10 acres• Forebay: 3 ac-ft• Dry Storage: 40 ac-ft• Wet Pond Surface Area: 4.8 ac.• Wet Pond Depth: 9 feet
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• Photos of basin 1
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• Photos of basin 1
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Phase 2
• Basin 2A– In front of Saydel High School– Limitations
• Cross Country Course• Upstream structure
– Design Details:• Drainage Area: 234 ac.• Basin Area: 4.7 acres• Dry Storage: 8.2 ac-ft
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• Photos of basin 2A
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• Basin 2 after
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Phase 2
• Basin 2B– Next to Saydel High School– Design Details:
• Drainage Area: 170 ac.• Basin Area: 2.4 acres• Dry Storage: 15.3 ac-ft• Water Quality Enhancements
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Phase 2
• Basin 3– South of Interstate 80– In City of Des Moines– Required Condemnation– Design Details:
• Drainage Area: 690 acres• Basin Area: 10.5 acres• Dry Storage: 49.9 ac-ft…
• Water Quality Enhancements
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• Plan and photos of basin 3
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• Project Closeout – January 2016• ~7 years from NOI• Final cost $8.5 million