Kona low flooding exposed a network of farmland drainage ditches overgrown with invasive mangroves — and drew a network of volunteers to clear them.

It Takes A Village To Prevent Future Oʻahu Storm Damage

Kona low flooding exposed a network of farmland drainage ditches overgrown with invasive mangroves — and drew a network of volunteers to clear them.

Kanoa Dahlin, left, and Julie Taniyama, clean up the bank of Ditch One at Mill 6 Farms in Waialua May 23, 2026. Overgrown mangrove was removed over a section of the ditch to help water flow after flooding in the area occurred during the March Kona low storms. (Craig Fujii/Civil Beat/2026)
Kanoa Dahlin, left, and Julie Taniyama, clean up the bank of Ditch One at Mill 6 Farms in Waialua. Overgrown mangroves were removed to improve water flow after flooding in the area during the March Kona low storms. (Craig Fujii/Civil Beat/2026)

The rain clouds overhead last weekend in Waialua provided a visual reminder to volunteers of why they had gathered to spend a Saturday at Mill 6 Farms.

Just two months ago, Kona low storms had damaged many farmers’ crops and property. To lessen the impact of future storms, two dozen residents and volunteers from Wellspring Covenant Church came to clear hau, noni and invasive mangrove trees from the banks of drainage ditches.

“We didn’t want to do it right after (the storms) but we knew we had to do it,” said Waialua Farmers Co-op board president Grace Kekahuna.

One of three ditches - Ditch One - was targeted for clearing at Mill 6 Farms in Waialua May 23, 2026. This ditch is 1,800 feet long, and one side of 180 feet was cleared over a four hour sprint by volunteers with chainsaws. (Craig Fujii/Civil Beat/2026)
One of three ditches targeted for clearing at Mill 6 Farms in Waialua. This ditch is 1,800 feet long, and one side of 180 feet was cleared over a four-hour sprint by volunteers with chainsaws. (Craig Fujii/Civil Beat/2026)
Julie Taniyama leaps off a pickup at Mill 6 Farms in Waialua May 23, 2026 followed by her daughter Sarah. Taniyama and church members from Wellspring Covenant Church volunteered to help clean ditches at the farm. (Craig Fujii/Civil Beat/2026)
Julie Taniyama leaps off a pickup at Mill 6 Farms in Waialua, followed by her daughter Sarah. Taniyama and church members from Wellspring Covenant Church volunteered to help at the Mālama ‘Aina event at the farm. (Craig Fujii/Civil Beat/2026)
Grace Kekahuna hugs David Taniyama after the two Maryknoll school mates recognized each other decades later at Mill 6 Farms in Waialua May 23, 2026. Kekahuna and the Waialua Farmers Cooperative arranged a work day to clear ditches to improve water flow after the Kona low storms, which flooded the area. Michelle Midro Ching, left, and Drew Enomoto, right. (Craig Fujii/Civil Beat/2026)
Grace Kekahuna hugs David Taniyama after the two Maryknoll schoolmates recognized each other decades later at the Mill 6 Farms volunteer event. Kekahuna and the Waialua Farmers Cooperative arranged a Mālama ‘aina work day to clear ditches to improve water flow after the Kona low storms, which flooded the area. Michelle Midro Ching, left, and Drew Enomoto, right. (Craig Fujii/Civil Beat/2026)

Government agencies have thus far dragged their feet with regard to ditch clearing, Kekahuna said.

“They’re just assessing stuff,” Kekahuna said. “So at that point we’re just like, you know what, let’s just do it.”

Complicating the work is land ownership. With single owners, “like Dole, Castle & Cooke, it’s so easy to manage, right?” Kekahuna said. “Once it was sold to different people, then it’s kind of like, oh wait, do we do it? Are we supposed to touch the ditch?”

The approximately 250-acre property is currently owned by real estate developer Peter Savio, who purchased the former cane land from Dole in 2022 as part of a handshake agreement with the farmers cooperative. Under that agreement, farmers will eventually own their own piece of the current property so they can farm indefinitely. But it’s still unclear who’s ultimately responsible for the overgrowth.

David Taniyama hands up a mangrove branch has he worked to clear overgrowth at a drainage ditch at Mill 6 Farms in Waialua May 23, 2026. Waialua Farmers Cooperative arranged for a half day of work to begin the daunting task of clearing three ditches of heavy growth. (Craig Fujii/Civil Beat/2026)
David Taniyama hands up a mangrove branch as he works to clear overgrowth from a drainage ditch at Mill 6 Farms. The Waialua Farmers Cooperative arranged a Mālama ‘Aina cleanup to begin the daunting task of clearing three ditches of heavy growth. (Craig Fujii/Civil Beat/2026)

The banks along the drainage ditches at Mill 6 Farms are covered with tightly packed trees that keep banks and shorelines from eroding, which is why mangroves were brought to Molokaʻi in 1902 by the American Sugar Company. Other varieties were brought from Asia to Oʻahu, according to a 1998 paper by the U.S. Forest Service.

For farmlands, importantly, the alien trees also trap sediment, crowd out native flora and animal habitat, and their robust growth slows water flow, exacerbating flood risk. The trees can be so problematic that the state Department of Land and Natural Resources asked for mangrove mitigation in Waipahu in August 2022.

Drew Enomoto, right, and Aubree Taniyama pull up a small tree from a drainage ditch at Mill 6 Farms in Waialua May 23, 2026. Waialua Farmers Cooperative and volunteers gathered to clear ditches to improve water egress after the Kona low storms in March. (Craig Fujii/Civil Beat/2026)
Drew Enomoto, right, and Aubree Taniyama pull up a small tree from a drainage ditch at Mill 6 Farms. (Craig Fujii/Civil Beat/2026)
Megan Dooley, front, and pastor Rebecca Stringer from Wellspring Covenant Church pull branches and small trees from a ditch at Mill 6 Farms in Waialua May 23, 2026. This ditch is 1,800 feet long and just more than 180 feet of one side was cleared in four hours. (Craig Fujii/Civil Beat/2026)
Megan Dooley, front, and Pastor Rebecca Stringer from Wellspring Covenant Church pull branches and small trees during a volunteer event. (Craig Fujii/Civil Beat/2026)

The bulk of the workforce that came out for the farmers’ co-op Mālama ‘Aina event came from Wellspring Covenant Church in Hālawa. Pastor Rebecca Stringer and church members turned out in force, just as they had during the March storms.

Even keiki helped haul branches to a growing pile of green debris during a cleanup of a ditch at Mill 6 Farms in Waialua May 23, 2026. (Craig Fujii/Civil Beat/2026)
Even keiki helped haul branches to a growing pile of green debris during a ditch cleanup at Mill 6 Farms. (Craig Fujii/Civil Beat/2026)

During the storms, the church and its members bought groceries for affected individuals and families, obtained the use of food trucks and prepared up to three thousand meals per day, Stringer said.

The church later obtained a grant from its parent church group to help with recovery efforts.

“When we heard about this workday, we were like, oh my gosh, we want to do something,” Stringer said. “We still have some trash bags, and you know we have some gloves that we bought with our grant funds.”

Megan Dooley gets a hand putting on waders during work clearing a ditch of overgrown trees and foliage at Mill 6 Farms in Waialua May 23, 2026. Rebecca Stringer, left,  and Julie Taniyama lend a hand. (Craig Fujii/Civil Beat/2026)
Megan Dooley gets a hand putting on waders during work clearing a ditch filled with overgrown trees and foliage. Rebecca Stringer, left, and Julie Taniyama are happy to help out. (Craig Fujii/Civil Beat/2026)

Those gloves were put to good use by church member David Taniyama, who came with his family from Mānoa to help. “I always surf out here, so I wanted to make sure that the community was OK,” he said.

The group also had use of borrowed heavy equipment and a roll-off truck, though they could use more volunteers and donations of chainsaws and fuel — both regular and diesel, board president Kekahuna said.

Markus Searls, left, steps down from a roll-off dumpster as he works alongside Lauren Taniyama at Mill 6 Farms in Waialua May 23, 2026. The two worked with volunteers to clear ditches of overgrown trees and plants to improve water flow after the Kona low storms flooded the area. (Craig Fujii/Civil Beat/2026)
Markus Searls, left, steps down from a dumpster as he works alongside Lauren Taniyama and other volunteers to clear ditches. (Craig Fujii/Civil Beat/2026)
Orlando Cadiente, Jr., was a blur of activity as he moved piles of green debris into a roll-off dumpster at Mill 6 Farms in Waialua May 23, 2026. The Waialua Farmers Cooperative arranged a ditch clean up to help water flow after the March Kona lows flooded the area. (Craig Fujii/Civil Beat/2026)
Orlando Cadiente, Jr., was a blur of activity as he moved piles of green debris into a roll-off dumpster at Mill 6 Farms. (Craig Fujii/Civil Beat/2026)

Ditch One is about 1,800 feet long, said Michelle Midro Ching, secretary of the Farmers Co-op. With just one half of a 180-foot stretch completed in four hours, the scale of the remaining work is daunting. The rest of Ditch One awaits, along with the other two ditches with similarly imaginative names.

The community still needs help, Midro Ching said.

“It’s been a horrible wonderful experience,” Ching said, recounting the Kona low storms and their aftermath. “The wonderful part is seeing people come together, and you’re seeing all the aloha with people helping each other.”

Shoes that lost a a battle against mud at Mill 6 Farms in Waialua May 23, 2026. The Waialua Farmers Cooperative and volunteers started the daunting task of clearing ditches of overgrown trees which slowed the drainage of rainwater causing flooding during the March Kona low storms. (Craig Fujii/Civil Beat/2026)
These shoes lost a battle against mud during a volunteer effort at Mill 6 Farms. (Craig Fujii/Civil Beat/2026)

Civil Beat’s coverage of climate change and the environment is supported by The Healy Foundation, the Marisla Fund of the Hawai‘i Community Foundation and the Frost Family Foundation.

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