Hawaii First Water

UH researchers link quality of coastal groundwater with reef

December;

(Honolulu, HI) Land-use practices on tropical oceanic islands can have large impacts on reef ecosystems, even in the absence of rivers and streams. Land-based pollutants, such as fertilizers and chemicals in wastewater, infiltrate into the groundwaters beneath land and eventually exit into nearshore ecosystems as submarine groundwater discharge (SGD)—seeping into the coastal zone beneath the ocean’s surface. In a study published recently in PLOS ONE, University of Hawai‘i at Mānoa (UHM) scientists used a combination of field experiments and chemical analysis of water and algae to show that the quality of coastal groundwater plays a major role in determining the health of nearshore ecosystems in Hawai‘i.

Various sources of pollution, such as agriculture or sewage treatment facilities, have identifiable chemical signatures, particularly the isotopes of nitrogen in the nutrients they contain. This study assessed groundwater quality, coastal water quality, and reef health across six different bays on Maui with various potential sources of pollution. By comparing the nitrogen isotope signature of algae tissues and potential pollution, the research group traced nutrients in the algae back to their land-based sources.

This study is the first to show the extent of the impact of wastewater injection wells at Kahului Wastewater Reclamation Facility, Maui’s highest-volume sewage treatment plant, on Kahului Bay. In addition to relatively high nutrient levels in marine surface waters in Kahului Bay, shallow areas were almost entirely dominated by a thick fleshy mat of colonial zoanthids, a phenomenon not reported anywhere else in the state. A concurrent companion study to this work, led by James Bishop at the UHM Department of Geology and Geophysics, found that water collected from beach sands, which represents coastal groundwater, next to the Kahului Wastewater Reclamation Facility contained up to 75 percent treated wastewater—highlighting the impact of wastewater in this area.

For the rest of this article including citations see

 

Study finds injection wells, agriculture harming Maui bays

November 2016;

HONOLULU (AP) – A team of University of Hawaii scientists has completed a study of nearshore ecosystems across Maui that shows the harmful impacts of discharged treated wastewater.

The findings were published in the scientific journal PLOS ONE earlier this month.

The scientists analyzed water and algae at six locations around Maui, including Kahului Bay, which is adjacent to Maui’s highest-volume sewage treatment plant. A study of the bay found high nutrient levels in marine surface waters near the Kahului Wastewater Reclamation Facility and a “thick, fleshy mat” of colonial zoanthids, a coral-like organism.

For the rest of the article see this…

‘Ike Wai: Securing Hawai’i’s Water Future, supported by NSF EPSCoR

October (Editor Comment:  Although NSF granted the UH $20 Million for water research earlier this year, see link to see how the UH is beginning to formulate its water research plan and its video.  See the link here)

Hawai‘i depends exclusively on local water. The ‘Ike Wai project will provide data and models that address the grand challenge of water sustainability. A diverse workforce of data scientists and water researchers will work in concert with the community, government and business to inform decision makers with high-quality data and predictive capacity.  The project incorporates indigenous and local communities, and its robust, inclusive and diverse human capital pipeline of undergraduates, graduate students, postdocs and junior faculty will address water challenges at the academic and policy level.

The Governor’s World Conservation Congress Legacy Commitment: “30 by 30 Watershed Forests Target”

The Hawaiian koa-‘ōhi‘a rainforests capture and provide the islands’ supply of fresh clean water, lessen impacts from climate change, dramatically reduce flooding and erosion into our coral reefs, provide an ecosystem for unique plants and wildlife, and have profound cultural significance. Approximately 20% of land area in Hawaiʻi is identified as priority watershed. In 2011, only 10% of these priority watersheds were protected.

The rest of the Governor’s statement is here…

Ige On Water Protection: Don’t Stop At Papahanaumokuakea

September: Nathan Eagle/Civil Beat:

Gov. David Ige welcomed a major environmental conference to Hawaii on Thursday by committing to protect more of his state’s watersheds and nearshore ocean waters.

Ige spoke to several thousand people at the opening of the International Union for Conservation of Nature’s World Conservation Congress, which will continue through Sept. 10 at the Hawaii Convention Center.

He announced the state’s commitment to protect 30 percent of its highest priority watersheds by 2030 and to “effectively manage” 30 percent of its nearshore ocean waters in the same time frame.

“We are a microcosm of our planet Earth,” Ige said during opening ceremonies at the Blaisdell Center. “We cannot afford to mess this up.”

(Comment:  Although a majority of the opening speakers addressed ocean issues, our governor opened his welcoming comments which a statement which directly concerns freshwater supplies on our islands.)

For the rest of the article and all of Civil Beat’s excellent coverage of the World Conservation Congress which is ongoing in Honolulu see this link

He Lono Moku

August: This week the IUCN World Conservation Congress will be held in Honolulu, Hawaii to further the cause of world environmental concerns.  A Hawaii based Environmental Funders Group published what will become an annual report on the state of Hawaii’s environment.   I will be attending the Congress and reporting on any interesting findings which are particularly focused on fresh water issues on Hawai’i and other Pacific Islands.  (By Larry Kobayashi)

Here is the preface and the link to actual report.

The State of the Environment: HAWAI‘I 2016

With the IUCN World Conservation Congress being held in the United States for the first time, Hawai‘i’s environment and sustainability efforts are on the world stage. He lono moku recognizes this global momentum and highlights priorities for environmental equilibrium in Hawai‘i. This state of the environment report shares our advances in freshwater security, renewable energy, and community-based marine management—and is candid about where our efforts are falling well short.

Each year, he lono moku will track and share progress across a variety of environmental topics. At the center of the world’s largest ocean and with a tourism economy directly linked to our environment, we cannot afford to overlook our precious natural resources. As the voyaging canoe Hōkūle‘a returns home after circumnavigating island earth, the Hawai‘i Environmental Funders Group joins the global call to embrace a “mālama honua”—care for the earth—mindset to ensure that our Islands thrive for generations to come.

Progress must be real—we cannot fool Mother Nature. The traditional Hawaiian proverb rings even more true today than centuries ago when first uttered: “He ali‘i ka ‘āina, he kauwā ke kanaka.” The land is a chief, man is its servant.

 

And here is the link to their report…

Paddling championship goes forward at Keehi Lagoon, despite water quality concerns

August 2016, KEEHI LAGOON, OAHU (HawaiiNewsNow) –

(Editor Kobayashi Comment:  Stormwater pollution continues to be a problem on the islands which will not go away.  Fortunately the control of stormwater resources will continue to offer solutions to future freshwater scarcity problems on the islands.  If stormwater can be slowed and saved, both pollution and freshwater supply scarcity problems can be reduced.)

The Hawaiian Canoe Racing Association’s state championships are going forward this weekend at Keehi Lagoon, but at least five canoe clubs have decided not to participate because of ongoing water quality concerns.

Flooding from Tropical Storm Darby sent large debris and trash into Keehi Lagoon, putting an upcoming outrigger canoe championship in limbo.

Participants, meanwhile, are being told to stay in their canoe on race day and out of the water.

A Brown Water Advisory for Keehi Lagoon has been lifted, but health officials say bacteria levels in the lagoon remain high.

Despite the problems, association officials are trying to remain upbeat.

“The flags are up. People are out here practicing. The tents the food booths everything is getting set,” said Water Vierra, president of the Hawaiian Canoe Racing Association.

He added, “We’re encouraging all clubs to forgo the use of boat holders. They have the most exposure to the water.”

The problems at the lagoon started with Tropical Storm Darby, which sent debris and dirty run-off into the waterway popular among paddlers.

While much of the big debris has been cleared from the lagoon, bacteria levels at Keehi Lagoon are still high.

As of Friday afternoon, five Oahu canoe clubs have pulled out the race. They are: Outrigger Canoe Club, Hui Nalu O Hawaii Canoe Club, Lanikai Canoe Club, Na Keiki O Ka Mo’i Canoe Club and Manu O Ke Kai Canoe Club.

Still, Vierra said, some 3,000 paddlers are expected to come out for the competition. Typically, about 3,500 participate.

Paddlers practicing Friday used duct tape to cover open cuts on their arms and legs. And everyone was wearing slippers in and out of the water.

See the rest of the article here…

Researchers reveal cost-effective path to drought resiliency

July 2016

(Kobayashi Comment:  This intriguing Stanford study may offer an answer to Hawaii’s future freshwater shortages…  Imagine routing Hawaii’s torrents of stormwater into the ground aquifers instead of washing brown water pollution onto our beaches and recreation areas…)

Strained by drought in recent years, California desperately needs more resilient water supplies. An affordable solution that provides a wide range of benefits is within reach, according to a new Stanford study.

“We find that MAR is an effective and affordable way to balance local groundwater decisions with regional and statewide management,” said study co-author Debra Perrone, a postdoctoral scholar with Stanford’s Water in the West program.

Many local communities rely on statewide infrastructure to supplement their water supply. This water is costly and limited in supply, raising a need for cost-effective local storage options.

Managed aquifer recharge allows for local water storage, access and management to a much greater extent than large surface water reservoirs, which are often managed by state and federal entities. Although excess surface water can be limited in some regions of California, treated wastewater and urban stormwater offer sources for MAR that aren’t fully utilized by centralized surface water storage infrastructure.

MAR is particularly well suited to more populous and developed areas that can take advantage of large quantities of treated wastewater and stormwater runoff collected by extensive infrastructure for use in recharge. In more rural areas, MAR using excess surface water can still play an important role in replenishing groundwater basins and guarding against dry times.

“Every year, California lets 1 million acre-feet of treated wastewater flow to the ocean,” said co-author Melissa Rohde, previously a researcher with Water in the West. “Our research shows it would cost the state about $870 million to build the necessary MAR facilities to recover and store this water. That’s not a lot of money compared to the cost and energy required to transport water from large surface water projects or to desalinate ocean water.”

A water enigma

Groundwater supplies up to 60 percent of California’s water supply during dry years. Despite its crucial role in slaking the Golden State’s thirst, groundwater went largely unregulated until the 2014 passage of the Sustainable Groundwater Management Act. Therefore, statewide data on groundwater management generally and managed aquifer recharge projects specifically has been sparse or proprietary, generally not shared publicly.

This lack of information was highlighted with the 2015 passage of California’s largest-ever water-related proposition — the $7.5 billion Proposition 1. The bond promises almost $3 billion for water storage projects. Without data on relative costs and benefits, state and local water managers are hard pressed to make informed decisions on MAR projects.

In addition to new funding opportunities, the 2014 law puts the burden on local agencies for sustainably managing groundwater. So, local communities have more reason than ever to bank water sustainably. Managed aquifer recharge allows agencies to do that in ways tailored to a community’s resources.

Perrone and Rohde set out to identify costs and benefits of MAR projects around the state by mining applications for general obligation bonds from ballot propositions. In these publicly available forms, the researchers identified proposed economic costs and anticipated MAR project benefits. Then, they surveyed the projects’ managers to compare initial estimates with actual costs, and to identify advantages and limitations.

Looking to the future

As a changing climate, growing population and other factors put increasing pressures on water supplies, California’s need for long-term resilience will only intensify, the study noted. Conservation will only go so far. Flexible water storage options that can address changing conditions are essential. Therefore, it is likely that more water agencies will adopt MAR as a local management tool.

Story Source:

The above post is reprinted from materials provided by Stanford University. The original item was written by Rob Jordan. Note: Materials may be edited for content and length.

Journal Reference:

  1. Perrone, Debra; & Merri Rohde, Melissa. Benefits and Economic Costs of Managed Aquifer Recharge in California. San Francisco Estuary and Watershed Science, July 2016