Science to Support Management of Maunalua Bay NREM 601 Spring 2019 - - PowerPoint PPT Presentation

Science to Support Management of Maunalua Bay

NREM 601 Spring 2019

Stream Retrofitting Solutions

David Lewis, Lesley Davidson, Laura Luther, Dain Christensen, Aimee Taniguchi

Kuliouou Stream Wailupe Stream

Introduction

• Population growth and

urbanization have led to + impervious surface area + sedimentation and flow rates

• impacts ecosystem health
• 9 of 10 stream systems in the

watershed are concrete-lined

(Mālama Maunalua, 2009)

Research Question & Objectives

Q: How can we reduce sediment from entering Maunalua Bay?

Kuliouou Stream

• Identify

○ Retrofitting ■ Governance issues ■ Retrofitting processes ■ Costs and expected benefits ○ Recognize systemic issues

Methods

• Expert Elicitation

○ 30 professional contacted ○ 9 semi-structured interviews ■ DLNR ■ Army Corps of Engineers ■ UH faculty ■ DOEE ■ Private Consultants

• Literature Review

Solutions & Best Management Practices (BMPs)

(SRGII, 2010 Wailupe Report)

Costs

(SRGII, 2010 Wailupe Report)

https://biocleanenvironmental.com

Upl Uplan and d Solutions

• Ex

Exte tende ded d de dete tenti tion bas basin

• Invasive species control
• Native vegetation

Graphic: Laurie Sumiye

St Steep p Sl Slope pe So Solutions

• Ba

Baffle Bo Box

• Co

Coir r Lo Log

• Infiltration trench
• Native vegetation
• Turf reinforcement mats

Urban Urban Solutions

• Ba

Baffle Bo Box

• Cu

Curb rb Inlet t Bas askets ts

• Grass swale
• Green roof
• Porous Pavement
• Rain barrels

Systems Issue

• Where to start?
• What are we targeting?
• Where to implement?
• Governance and Process Issues

Kuliouou Stream

Systems Perspective

DPSIR Framework

Process

hic

Key Takeaways

• Fill Data Gaps

○ Quantify sediment inputs &

• utputs (sediment budget)

○ Hydrologic Modeling

Niu Valley

In-stream retrofitting options are one solution to a complex problem, other systemic issues are still impacting the health of the Bay.

Mālama & Take Action

• Get involved

○ Help to restore riparian areas & remove invasive species http://dlnr.hawaii.gov/volunteer ○ Press leaders for green infrastructure ○ Environmental Notice: http://health.hawaii.gov/oeqc/

• Good housekeeping practices

Mahalo nui loa

• Dr. Kirsten Oleson & Dr. Laurie Richmond
• Mālama Maunalua
• To all professionals interviewed
• Community members and organizations working on

this important issue

• Community members and leaders in attendance

References

Mālama Maunalua. 2009. Maunalua Bay conservation action plan: a community's call to action. Mālama Maunalua, Honolulu,

• HI. (Mālama Maunalua 2009)

Saldi-Caromile, K., K. Bates, P. Skidmore, J. Barenti, D. Pineo. 2004. Stream Habitat Restoration Guidelines: Final Draft. Co-published by the Washington Departments of Fish and Wildlife and Ecology and the U.S. Fish and Wildlife Service. Olympia, Washington.

Sustainable Resources Group Intn’l, Inc. (SRGII), 2010 Watershed Based Plan for Reduction of Nonpoint Source Pollution in Wailupe Stream Watershed. Malama Maunalua resource library. http://www.malamamaunalua.org/resource-library/

Resource tap:

• Our report https://scholarspace.manoa.hawaii.edu/handle/10125/45367
• Malama Maunalua http://www.malamamaunalua.org/resource-library/
• Environmental Notice http://health.hawaii.gov/oeqc/

Questions?

Wailupe Stream Kuliouou Stream