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Hanalei Bay Watershed

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by Mr. Matt Rosener …

by Mr. Matt Rosener
Hydrologist, Hanalei Watershed Hui
at the Hawaii Water Quality Conference 2008

Published in: Economy & Finance, Travel
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  • 1. Water Quality in the Hanalei Bay Watersheds Matt Rosener Hydrologist Hanalei Watershed Hui
  • 2. Location
  • 3.  
  • 4. Place of extraordinary natural beauty…
  • 5. … steeped in cultural traditions
  • 6. Hanalei Watershed Hui
    • Small, non-profit conservation organization
    • Working to protect the resources of Hanalei
    • Do this by:
      • Studying watersheds, identifying problems
      • Planning for solutions & implementing them
      • Education & outreach programs
  • 7. Hanalei Bay Watersheds TMDL Study
    • Draft TMDL completed Jan. ’07
    • Tetra Tech was contractor
    • Hanalei Watershed Hui did storm sampling
    • DOH presented to community Feb. ’07
  • 8. Following tables/graphics from the TMDL report
  • 9. TMDLs and Load Targets for the Hanalei Bay Watersheds
    • Draft TMDLs developed for enterococcus and turbidity (linked to TSS)
    • Draft Load Targets developed for nutrients (TP, TN, NH 4 , NO x )
  • 10.  
  • 11.  
  • 12.  
  • 13.  
  • 14. ~ 90% of land area is forest or scrub/shrub land cover ~ 90% of TSS and Enterococcous loads attributed to these areas
  • 15. Are the Load Reduction Prescriptions Realistic?
    • Possibly for Enterococcous, esp. if human source is dominant and effectively addressed
    • Probably not for suspended sediment
    • Why not?
  • 16.  
  • 17. Nature of place to experience frequent high rainfall/runoff and infrequent extreme flooding event Entire Hanalei coastal plain is part of Hanalei R./Waioli Str. floodplain
  • 18. Beach Monitoring –Entero Stats 2003
  • 19.  
  • 20. Stream Monitoring –Entero Stats 2003
  • 21. What are we doing about it? Hanalei Watershed BMPs
  • 22.  
  • 23.
    • County cesspool & septic system
    • up-grades at beach parks
  • 24. New Septic Systems Installed at County Facilities in Hanalei
    • At Hanalei Baseyard on 2 March 2006
    • At Pavilion (men’s) on 8 March 2006
    • At Pavilion (women’s) on 9 March 2006
  • 25. HWH replacing septic upgrades for homes in/near riparian areas
  • 26.  
  • 27.  
  • 28. All waters turbidity-impaired
  • 29.  
  • 30. Trail Restoration
  • 31. Next Steps
    • Focused monitoring & source assessment
    • Develop Watershed-based Action Plan
    • Implement BMPs & monitor effectiveness
    • Continue water quality research programs
  • 32. Mahalo
  • 33. TMDLs and Load Targets for the Hanalei Bay Watersheds
    • Draft TMDLs developed for enterococcus and turbidity (linked to TSS)
    • Draft Load Targets developed for nutrients (TP, TN, NH 4 , NO x )
  • 34. Technical Approach
    • Developed a modeling framework to assess cause-effect relationship between source contributions and response of the river, estuary, and bay
    • Tested/calibrated the model using available flow and water quality monitoring data at multiple locations
    • Used model to determine source loads that enable river, estuary, and bay to achieve applicable water quality criteria at all times
  • 35. Modeling Framework
    • Watershed model: EPA’s Loading Simulation Program in C++ (LSPC)
      • Watershed hydrology and flow in Hanalei River
      • Erosion from the land surface and mass transport in the river
      • Bacteria and nutrient loading from the land surface and transport in the river
    • Estuary and bay model: EPA’s Environmental Fluid Dynamics Code (EFDC)
      • Freshwater inputs from watershed model used as boundary condition
      • Fate and transport of bacteria, nutrients, and TSS in the Hanalei Estuary (tidal) and Hanalei Bay
      • 1-dimensional representation of the estuary
      • 2-dimensional representation of the bay
  • 36.  

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