Two-Stage Ditch Design - EPA's Web Archive
Transcript of Two-Stage Ditch Design - EPA's Web Archive
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Two-Stage Ditch DesignHelping Nature Improve the
Function of Agricultural Drainage Ditches
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Is there something better?
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Channel Evolution
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Two-Stage Ditch Design
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Low Grassed Bench
Main Channel
Additional Filters Next To Fields
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Elev
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Additional Filters Next To Fields
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Potential Benefits of 2-Stage Drainage Channel ModificationsDecreased bank erosion and sedimentation, resulting in a reduced need for drain maintenanceDecreased suspended solids and fluctuations in dissolved oxygenProcessing and capture of nitrogen and phosphorusRestore pool and riffle habitatsContinue to provide the required drainage capacity for agricultural production
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Implementing Two Stage beyond a Demonstration
Key Steps:• OSU worked with USDA to draft language for National
NRCS Engineering Manual.• IN STC a venue to share the performance data from
NDU/OSU on initial demonstration sites. • Combination of Eng. Manual (allowed NRCS to C/S)
and performance data helped convince STC to make it a cost-sharable practice within EQIP.
• CCPI – tool to conduct technology transfer with NRCS staff – teach the technical staff.
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Progress as of2010.
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Barriers/Challenges
Cost $9.00/ft on average for 2-stage; conventional cleanout - <$2.00/ft. (payoff takes place over a few decades)Extra land – 1 acre/.5 mi. Compatibility with FSA – CRP Filter StripsTechnology TransferChange fatigue
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Resource Needs
Initial funding at local level to help with the transition and installation.Broader acceptance by landowners –outreach and education.Technology transfer – “digging a better ditch”Boots on the ground.
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Ohio I llinois
M ississippi Ohio
Ohio Michigan
South Africa
Minnesota
Ohio