Studies and Research in the Priority Watersheds & Related Links
Learn the Basics
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Assessing the Resilience of Leeward Maui Reefs to Help Design a Resilient Managed Area Network - 2019 Report
The project team assessed the relative resilience of reef sites at two depths along areas of West and South-West Maui ("leeward Maui") in March of 2018. The surveys were conducted as a collaborative effort with DAR, The Nature Conservancy, and community organizations. This report presents findings from meeting these project objectives: 1) assess benthic cover comparisons among sites and depths, 2) complete resilience assessment including relative resilience and rankings for two depths, 3) conduct analyses that determine the primary drivers of differences in resilience between sites, and 4) develop a framework for using the resilience analysis outputs to identify and prioritize potential management actions to support the resilience of coral reefs in Maui.
Citation: Maynard J, Conklin E, Minton D, Williams GJ, Tracey D, Amimoto R, Carr R, Fielding E, Lynch H, Rose J, Sparks R, Sylva R, White D. (2019). Assessing the Resilience of Leeward Maui Reefs to Help Design a Resilient Managed Area Network. NOAA Coral Reef Conservation Program. NOAA Technical Memorandum CRCP 33, 40 pp.
Detailed maps of West Maui Reefs from the Pacific Islands Benthic Habitat Mapping Center
USGS West Maui Research Summary
Sunscreens & Reef Health
Link between fire and ocean health- by HWMO
Created in 1997 through the community based West Maui Watershed Management Advisory Committee is the West Maui Watershed Owners Manual. Despite the changes to our land use patterns and environmental challenges since its release, this guide written for the community still contains highly relevant advice about actions anyone living, working or playing in West Maui can take to make a positive difference. This was funded by the DOH, USEPA and NOAA.
Guidance for Watershed Managers
The US Coral Reef Task Force Watershed Working Group Metrics Subcommittee has developed metrics guidance documents to assist with what parameters are important for watershed managers to collect to track progress. The priority Ecosystem Indicators include water quality and coral metrics, while the Programmatic Checklist focuses on the non-ecological factors that play into success, such as institutional support, a watershed management plan, local governmental support etc.
Hawaii Regional Sediment Management (RSM): Regional Sediment Budget for the West Maui Region by US Army Corps of Engineers
By: Jessica H. Podoski, Thomas D. Smith, Zeki Demirbilek, Lihwa Lin, and Linda S. Lillycrop
ABSTRACT: (June 2016) This technical report provides a description of the Regional Sediment Management (RSM) investigations performed by the U.S. Army Corps of Engineers (USACE), Honolulu District (POH), along the West Maui coastal region of the Island of Maui, HI. The methodology for determining volume change rates as well as numerical modeling is discussed, including the particle tracking modeling, in support of identifying sediment pathways for the development of the regional sediment budget for the West Maui coast. The West Maui Region incorporates a thin coastal margin backed by steep mountainous terrain that has been vastly altered by agricultural and urbanized development. Shoreline hardening is being proposed along portions of the region’s coastline. Shoreline change for this area was quantified by the U.S. Geological Survey (USGS). All subregions were found to be erosional in the long and short term, based on average rates. The dynamics of the area are complex with a wave climate affected by intricate bathymetry, wind, and island sheltering. Currents vary from nearshore to offshore and within the water column. Coastal morphology includes headlands and reefs with a very limited supply of sediment. Wave and current models indicate that large waves in the summer and winter drive the majority of sediment transport (northward-directed in summer and southward-directed in winter). Because of these seasonal patterns, the net transport of sediment is small. There is evidence of nearshore eddy formation that increases the complexity of sediment transport in the region with sediment pathways changing on short-term (hours) to longerterm (weeks to months) temporal scales. This is a very dynamic and seasonally affected shoreline, and the present RSM study is one tool that will help inform future shoreline management in the region.
Reconnaissance Sediment Budget for Selected Watersheds of West Maui, Hawai‘i
Open-File Report 2015-1190
By:Jonathan D. Stock, Kim A. Falinski, and Tova Callender
ABSTRACT: Episodic runoff brings suspended sediment to the nearshore waters of West Maui, Hawaiʻi. Even small rainfalls create visible plumes over a few hours. We used mapping, field experiments, and analysis of recent (July 19–20, 2014) and historic rainfall to estimate sources of land-based pollution for two watersheds in West Maui: Honolua, and Honokōwai. Former agricultural fields and some unimproved roads are plausible sources for polluted runoff, but have saturated hydraulic conductivities greater than the 10–15 millimeters per hour rainfalls of July 2014. These fields and roads showed minor evidence for storm runoff, and could not have contributed substantially to July 2014 plume generation. Since 1978, rain at intensities capable of causing runoff from former agricultural fields sustained for 1–2 hours is also rare; such intensities have 2–5 year recurrence rates in the north, and greater than 25 year recurrence rates to the south near Lahaina. Streambanks now eroding into historic terraces of sands, silts, and clays are a more plausible source. Although past large storms contributed to sediment loading, annual plume generation is now caused by smaller rainfalls eroding these near-stream legacy deposits. Treatments of former agricultural fields, roads, and reserve forests are consequently not likely to measurably affect sediment pollution from smaller, more frequent storms. Increased runoff from the development of West Maui has the potential to exacerbate sediment plumes from such storms unless there is an effective strategy to reduce bank erosion. Uncertainties in the extent and erosion rate of historic terraces, however, limit our ability to plan mitigation.
Rain Catchment Resources
In 2004, CTAHR developed Guidelines on Rainwater Catchment Systems for Hawai‘i. An estimated 30,000 to 60,000 people in the state of Hawai‘i are dependent on a rainwater catchment system for their water needs. With proper design, maintenance, and water treatment, a rainwater catchment system can provide water that is relatively free of contamination, soft, clear, and odorless; this water can be used for drinking, bathing, washing, flushing,laundry, and gardening. Follow the link to read the 52 page guide and begin catching your own water!
Rain Garden Resources
Six minute PBS video documenting a movement in Seattle to install 12,000 rain gardens.
This community based non-profit on Oahu developed Hawaii's first rain garden manual (below) and has great rain garden examples and resources available on line.
Download the Hawaii Residential Rain Garden Manual here
Links to Partner Agencies & Organizations
NOAA Coral Reef Program: http://coralreef.noaa.gov/
DLNR Department of Aquatic Resources: http://www.hawaiicoralreefstrategy.com/
U.S. Army Corps of Engineers: http://www.poh.usace.army.mil/
Hawaii State Department of Health: http://health.hawaii.gov/
U.S. Environmental Protection Agency: http://www.epa.gov/
U.S. Geological Survey: http://www.usgs.gov/
U.S. Fish and Wildlife Service: http://www.fws.gov/
National Fish and Wildlife Foundation: http://www.nfwf.org/coralreef/Pages/home.aspx#.U8SnrrHCd8E
Hui O Ka Wai Oka: https://www.huiokawaiola.com/
West Maui Mountains Watershed Partnership: http://www.westmauiwatershed.org/
The Nature Conservancy: http://www.nature.org
The Coral Reef Alliance: http://www.coral.org/
County of Maui: http://www.co.maui.hi.us/
Maui Nui Marine Resource Council: http://www.mnmrc.org/