NATHANS LAKE WETLAND RESTORATION

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NATHANS LAKE WETLAND RESTORATION

• MILLARD NORTH HIGH SCHOOL

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(No Transcript)
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Present Day View of Nathans Lake Area
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Millard North Society of American Military
Engineers Project Team
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BRAINSTORMING AREAS OF INTEREST

• Criteria
• Local Relevance
• Real World Implications
• Exposure to Multi-discipline Professional
  Community
• Opportunity to Apply Computer Tools

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COMPUTER TOOLS

• Data Slate
• Historical Aerial Photo Chronology
• Vista Pro
• 3-D Visualization Imagery

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COMPUTER TOOLS

• DataSlate
• Historical Aerial Photo Chronology

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COMPUTER TOOLS

• Vista Pro
• 3-D Visualization Imagery

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Site Suitability

• Geomorphological Considerations
• Water table
• Soil type
• Seed bank
• Contours
• Land Availability

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NRCS SOILS MAP
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Alternative Restoration Methods

• Screening Criteria
• Adequacy of Water Source for Restoration
• Reliability of Water Source
• Construction, Operation Maintenance Costs
• Socioeconomic Considerations

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Alternatives Considered

• Construction of a diversion from the Missouri
  River north of Boyer Chute
• Excavation to groundwater
• Use of a windmill to pump water into wetlands
• Divert flows from Deer Creek - the preferred
  alternative

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Measuring Deer Creek
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ANNUAL WATER BALANCE ASSESSMENT

• Gains into the Wetland
• Rainfall 30 inches
• Surface Runoff is negligible
• Losses from the Wetland
• Infiltration 15 inches
• Evaporation 44 inches
• Transpiration 37 inches
• Net Annual Loss of 66 inches or 5.5 feet

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Darcys Law

• Used to calculate infiltration losses
• Q kia
• Q is the amount of water lost from infiltration
• k is the permeability of the bottom of the
  wetland (assumed a value for clay of 0.6 feet per
  year)
• I is the hydraulic gradient pushing the water out
  of the bottom of the wetland (assumed 2 feet of
  water above one foot of clay)
• A is the area of the wetland
• Q 1.2 feet/year per unit area

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DEER CREEK DIVERSION REQUIREMENTS

• Surface area of the proposed wetland is 30 acres
• Annual loss is 5.5 feet of water
• Total annual loss over 30 acres is 165 acre-feet
• 165 acre-feet per year converts to 0.2 cubic feet
  per second
• Is 0.2 cubic feet per second available in Deer
  Creek?

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DEER CREEK FLOW RATE

• Actual flow rate measured in March of 1999
• Flow velocity was 1.3 feet per second (based upon
  floating pop bottle flow meter)
• Channel width was 5 feet
• Channel depth was 1 foot
• Flow rate velocity x width x depth
• 6.5 cubic feet per second
• which is gt than 0.2 cfs

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BERNOULLIS EQUATION

• Used to size the pipe which will divert water
  from Deer Creek into the wetland
• Used to assess an open gate during high creek
  stages
• Converts potential energy ( h water depth above
  the pipe ) into kinetic energy (v water
  velocity flowing in the pipe)
• v2 / 2g h (g is the gravitational constant of
  32.2 feet per second2)

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Features of the Preferred Alternative

• 2-Foot High Rock Weir to Impound Deer Creek
• 15-Inch Pipe to Provide Flows from Deer Creek to
  the Wetlands
• Culvert under existing road
• 4-Foot Embankment to prevent potential flooding
  of adjacent properties
• Use of existing outlet structure
• Approximate Cost 200,000

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Lessons Learned

• Exposure to various professional disciplines
• Recognition of the value of collaboration for
  project success

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Lessons Learned (Contd)

• Project Management
• Conflicting Schedules
• Milken Educational Virtual Workspace
• Time Allocation Identification Scoping vs.
  Resolution Recommendations
• Project Content
• Limited Vegetation Analysis in the field due to
  season
• One Time Stream Measurements
• Value of Historical Mapping Photography in
  applied science
• Ability to interpret mapping aerial photography
• Use of new computer tools

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Thank You