Sustainability for Water Quality Infrastructure: South Bethany’s Tidal Pump System Presented to


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Sustainability for Water Quality Infrastructure: South Bethany’s Tidal Pump System

  • Presented to:

  • Tri-Association

  • Annual Conference

  • August 27, 2008

  • Presented by:

  • KCI Technologies, Inc.

  • Oceaneering International Inc.


Agenda



Sustainability in Water Infrastructure

  • Sustainability –

    • A state or process that can be maintained indefinitely
    • Balance Environment/Social/Economic Components
    • EPA defines it with 4 components-
      • Asset Management
      • Infrastructure Financing
      • System Efficiency
      • Innovative Solutions
  • Power use by water infrastructure is significant

  • What can be done to change it?

    • Innovation


Sustainability in Water Infrastructure

  • South Bethany Tidal Pump Fits the definition on all EPA points but especially for:

      • System which is fiscally maintainable by projected capital resources
      • Energy Efficiency
      • Innovative Solutions


South Bethany’s Inland Canals

  • South Bethany, Delaware canals

    • Built 1950s and 60s.
    • To increase waterfront property.
    • No effective means of circulation with ocean water
      • 1600’s inlet existed at the site
  • Increased stormwater loading over time



South Bethany’s Inland Canals

    • Circulation to ocean –
      • Ocean City inlet -14 miles south
      • Indian River inlet - 7 miles north
        • Result = Low flushing
    • Flow minimal to inlets.
    • Flushing time in canals
      • normal = > 120 days at dead end.
      • Flush to ocean based on residence time in inland bays


The Problem

  • Poor circulation

  • Low oxygen levels

  • Excessive nutrient loading



A Solution

    • Worked up concept starting in 2002
    • Produced system layout for evaluation
    • Conversed with regulatory personnel for initial buy-in
    • City Council approved funds to investigate system


The Tide as Power

  • Kinetic -

    • Tidal generation turbines
  • Potential -

    • Tidal barrage generating stations
    • A Tidal powered pump?


Tidal Pump Concept

  • Conventional Pump = Head delivered by impellors or other means powered by electricity / fossil fuels

  • Tidal Pump = Head to drive circulation delivered by the tide only



The Tides

  • Tide cycles vary based on location on earth

  • Ocean and Inland Bays Tides are diametrically opposed

    • normally +/- 6 hours shifted
    • When High Tide in the Ocean its low in the canals
    • When Low tide in the Ocean its high tide in the canals


Tidal Pump Concept

  • Tidal differential as power

  • Tides opposite between ocean and canal system

  • Draws water back and forth through underground pipes

  • Creates circulation



Tidal Pump Concept



First Steps

  • South Bethany evaluation

    • Enterix hired to assess viability by modeling preliminary system as well as the mixing predicted through
      • Limited study – one scenario only
      • Results positive – proved system could work
    • Town took next step for preliminary engineering study and cost estimate


Design Study

  • KCI Teamed with Oceaneering International Inc. to complete a design study

    • Budgetary study
    • Preliminary Design
    • Evaluation of flow viability
    • Evaluation of environmental factors


Design Challenges

  • Low flow velocity

    • 1 - 2 fps
    • 2,000 – 4,000 gpm
  • Environmental factors

    • Ocean currents, storms and waves
    • Scour
    • Ocean depth
  • Marine growth and fouling



Innovative Solutions

  • Careful consideration of environmental factors

  • Hydraulic analysis using WaterCAD

  • Fully sustainable, tidal power

  • Fully-closed system

  • Applied water distribution design and modeling techniques



System Modeling

  • WaterCADD chosen to hydraulically model system

    • Variable system configurations evaluated
    • Roughness factors varied based on material and fouling scenarios
  • System similar to a potable water distribution system - closed



Pipe Evaluation

  • Based upon the WaterCADD results the optimum size for the pipe lines could be determined.

    • Evaluation of a wide range of options of material completed for the system


Environmental Considerations

  • Sediment Loading

  • Geology

  • Corrosivity

  • Permitting

  • Green Power

    • 8,000 kW/yr
    • = to 1 hp pump


System Elements

  • Circulation of 3 mgd

  • 2 miles of underground pipe - HDPE

    • 36” – 5,010 feet on shore
    • 36” – 3,200 feet offshore to 2 I/O structures
    • 12” - 2,026 feeder lines
  • Dual intake/outfall structures 1,600 feet offshore

  • Access manholes 12 Manholes

  • System of manual and automated control valves for regulation of system

    • 11 Control Valves
    • 9 on the 12” manual
    • 2 on the 36” automatically actuated
  • Propeller meter for monitoring flow



Project Status

  • Design Study completed Summer 2007

  • Town conversing with regulators

    • To address potential permitting issues
  • Project funding is still pending



Moving Forward

  • Chance to harness alternative energy source and create sustainable infrastructure

  • ~ zero energy footprint

  • Green power concept

  • Potential applications world wide

  • Award Winning concept

    • ACEC Maryland
    • AAEE National Honor Award


Questions and Answers




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