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Potential & Performance of Riparian Buffers as BMPs in Hawaii Watersheds

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By Dr. Ali Fares Department of Natural Resources & Environmental Management, UH Manoa Hawaii Water Quality Conference 2008

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Potential and Performance of Riparian Buffers as BMPs in Hawaiian Watersheds Ali Fares Watershed Hydrology, NREM-CTAHR- UH Manoa. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Non-point source pollution ,[object Object],[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
[object Object],[object Object],Riparian buffers 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Buffer types ,[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Riparian buffers Vegetative buffer strips ,[object Object]
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 ,[object Object],[object Object],[object Object],Buffer design Precision buffer Slope Fixed width buffer
Why Variable/Precision Buffers? ,[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Fixed width buffer ,[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Dosskey et al. 2005
Fixed width buffer ,[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Dosskey et al. 2005
Site topography 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Slope, % Width, ft 8% 100 20% 125 25% 150 Source: The Maryland-National Capital Park and Planning Commission Width Width = 0.17slope 2 – 2.7slope + 111 (R 2 = 0.99) Slope
Variable width buffer ,[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Dosskey et al. 2005
Variable width buffer 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Basics of precision buffer design Dosskey et al. 2005
[object Object],[object Object],[object Object],[object Object],[object Object],Variable width or precision buffers 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
DEM and Rain Spatial Distribution 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Spatial distribution of Runoff & Sediment 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Buffer width 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Buffer width is function of desired function (after A.H. Todd, 2000) Buffer width for nutrient removal is narrower than that for sediment removal Water Temperature Moderation Streambank Stabilization Nutrient Removal Sediment Removal Flood mitigation Wildlife habitat Buffer width (meters)
Case Studies ,[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Goal of the Project ,[object Object],[object Object],[object Object],[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Removal of invasive species 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Native Plant Used 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Overview of the study site Kaika-Wailua Watershed (Oahu’s north shore) Case study 2 Performance of Cover Crops as vegetative buffer strips to Control Water contaminants at the Source in Tropical Agricultural Land Vegetative buffer strips
Case study 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 ,[object Object],[object Object],[object Object],[object Object],Experimental design Collection bucket
Materials and Methods 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Results: Sediment Sunn hemp Oats Fallow Sudex
[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Case study Total Dissolved Sediment B A B B
06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 B A B B
Results ,[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
[object Object],[object Object],[object Object],[object Object],Conclusions 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Mahalo! Do You have any questions? 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
High turbidity threatening coral reefs 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 25-27 2007 11" of Rain 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Benefits of Riparian Buffers ,[object Object],[object Object],[object Object],[object Object],06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
Economic benefits 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Benefits to the Farmers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Potential & Performance of Riparian Buffers as BMPs in Hawaii Watersheds

  • 1. Potential and Performance of Riparian Buffers as BMPs in Hawaiian Watersheds Ali Fares Watershed Hydrology, NREM-CTAHR- UH Manoa. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
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  • 11. Site topography 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Slope, % Width, ft 8% 100 20% 125 25% 150 Source: The Maryland-National Capital Park and Planning Commission Width Width = 0.17slope 2 – 2.7slope + 111 (R 2 = 0.99) Slope
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  • 13. Variable width buffer 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Basics of precision buffer design Dosskey et al. 2005
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  • 15. DEM and Rain Spatial Distribution 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 16. Spatial distribution of Runoff & Sediment 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 17. Buffer width 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Buffer width is function of desired function (after A.H. Todd, 2000) Buffer width for nutrient removal is narrower than that for sediment removal Water Temperature Moderation Streambank Stabilization Nutrient Removal Sediment Removal Flood mitigation Wildlife habitat Buffer width (meters)
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  • 20. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 21. Removal of invasive species 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 22. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 23. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 24. Native Plant Used 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 25. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Overview of the study site Kaika-Wailua Watershed (Oahu’s north shore) Case study 2 Performance of Cover Crops as vegetative buffer strips to Control Water contaminants at the Source in Tropical Agricultural Land Vegetative buffer strips
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  • 27. Materials and Methods 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 28. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 Results: Sediment Sunn hemp Oats Fallow Sudex
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  • 30. 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008 B A B B
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  • 33. Mahalo! Do You have any questions? 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
  • 34. High turbidity threatening coral reefs 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 25-27 2007 11" of Rain 06/02/09 Fares, Hawaii Water Qualtiy Conference, March 24-25 2008
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