Sediment and Nutrient Reductions in Constructed Water Quality Ponds - - PowerPoint PPT Presentation

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Sediment and Nutrient Reductions in Constructed Water Quality Ponds - - PowerPoint PPT Presentation

Sep 17, 2023 120 likes •354 views

Sediment and Nutrient Reductions in Constructed Water Quality Ponds Dave Bjorneberg Jim Ippolito Agriculture Research Service Northwest Irrigation & Soils Research Lab Kimberly, Idaho ARSResearch for a Growing World Northwest

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Sediment and Nutrient Reductions in Constructed Water Quality Ponds

Dave Bjorneberg Jim Ippolito Agriculture Research Service Northwest Irrigation & Soils Research Lab Kimberly, Idaho

ARS—Research for a Growing World

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Northwest Irrigation & Soils Research Lab Kimberly, Idaho

  • 2 agricultural engineers
  • 6 soil scientists
  • 1 sugar beet geneticist
  • 1 sugar beet pathologist
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SLIDE 3

Upper Snake Rock Conservation Effects Assessment Project

Weekly samples from 26 sites from 2005-2008.

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  • 1500
  • 1000
  • 500

500 1000 1971 2005 2006 2007 2008

Suspended Sediment (kg/ha)

Inflow Outflow Net

Sediment loss has decreased since 1971 when watershed was 95% furrow irrigated.

Irrigation Season Suspended Sediment Balance (May through September)

Net Loss Net Gain

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SLIDE 5
  • 0.5
  • 0.25

0.25 0.5 0.75 1 1969 2005 2006 2007 2008

Dissolve P (kg/ha)

Inflow Outflow Net

Annual Dissolved Phosphorus Balance

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SLIDE 6
  • 35
  • 30
  • 25
  • 20
  • 15
  • 10
  • 5

5 1969 2005 2006 2007 2008

Nitrate-N (kg/ha)

Inflow Outflow Net

Annual Nitrate-N Balance

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SLIDE 7

No nitrate in irrigation water. Nitrate is from subsurface drain tunnels/tiles.

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LS & LQ Drains (Pigeon Cove) Year Flow (acre-ft) Sediment Concentration (mg/L) Sediment Load (tons) 1971 880 1040 12400 2005 1430 400 7700 2006 1240 210 3500 2007 2220 70 2200

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Sprinkler Irrigation: 5% in 1971, 35% in 2005

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Pond Study Summary

  • 1. Collected samples from five ponds for 2-3 days in

May, July and September 2008.

  • 2. Ponds were 2 to 10 years old and ¼ to 70 acres in

size.

  • 3. Retention time was 2 to 10 hours.
  • 4. 20 to 80% reduction in sediment concentration.
  • 5. Total phosphorus reductions were related to sediment

reductions.

  • 6. Dissolved phosphorus and nitrate concentrations

were low with inconsistent reductions.

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Britt Pond

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Cedar Draw

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Malone Pond

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S Coulee

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Lower Perrine Ponds

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All significantly different

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significantly different

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significantly different

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Questions?