The extreme floods of March 2026 will be remembered across South Maui for their scale and impact—homes flooded, roads cut off, infrastructure damaged, and entire neighborhoods left dealing with mud, loss, and disruption. The rainfall was significant, among the heaviest recorded in decades. But what defined this event was not just how much rain fell. It was that the entire system was activated at once.
When the Entire System Is Activated
Kihei has experienced flooding before. Individual gulches have overflowed. Certain neighborhoods have taken on water during past storms. Those events exposed weaknesses, but they were often localized.
March 2026 was different.
Multiple gulches—Waikōkoa, Kulanihakoi, Waipuilani, and many smaller unnamed channels—were all carrying peak flow simultaneously. Floodways filled. Culverts backed up. Outlets were overwhelmed. Every part of the system was under stress at the same time.
A system that can sometimes absorb isolated failures cannot withstand system-wide loading. When every drainage pathway is active at once, every bottleneck becomes critical, and every shortfall is exposed.
A Known Problem, Repeated for Decades
The risks in Kihei have never been unknown. Severe storms in the 1970s and beyond exposed the same drainage failures that are being seen today. Over the years, community groups, residents, and local leaders have repeatedly raised concerns about inadequate drainage infrastructure.
Organizations such as Save the Wetlands, the Kihei Community Association, and others have documented flooding, testified at hearings, and called for improvements. The message has been consistent: the system is incomplete, underbuilt, and unable to handle the realities of this watershed.
These warnings were based on experience. What happened in March 2026 confirmed them.
Plans That Identified the Problem
South Maui is not lacking in analysis. The Kihei Drainage Master Plan and other watershed studies have already identified the shortcomings of the system. They mapped the flood risks, outlined the infrastructure required, and provided cost estimates for what it would take to build a system capable of handling major events.
Those plans exist. The solutions are known.
What has not followed is implementation at the scale required.
Infrastructure That Was Never Completed
In some cases, infrastructure was started but never brought online. Above Waipuilani Gulch, a large detention structure was constructed but never fully connected or put into service. It stands as a clear example of a partially built solution that never became functional.
This pattern—recognizing the need, beginning the work, and failing to complete it—has left the system fragmented and underperforming.
Development That Outpaced Infrastructure
At the same time, development across Kihei has continued. Larger homes, more paving, and reduced open space have increased runoff across the floodplain. More water is entering a system that has not been expanded to accommodate it.
Developers are required to address stormwater impacts, but in practice those requirements are often reduced. Instead of designing for higher-capacity events, standards are lowered—from systems intended to handle a 100-year storm down to those designed for a 50-year storm.
That decision has consequences.
A 100-year storm does not mean it happens once every hundred years. It means there is a one percent chance of that level of rainfall in any given year. With changing climate patterns, those probabilities are shifting. High-intensity storms are becoming more frequent, not less.
Designing for lower capacity in a place that is already vulnerable increases risk over time.
The Real Cost of Failure
When the system fails, the consequences are immediate.
Homes are flooded. Families lose property, vehicles, and personal belongings. Many do not carry flood insurance, and recovery becomes a long and uncertain process. Roads become impassable, cutting off access and delaying emergency response.
People are forced to move through contaminated floodwater. In areas without sidewalks, there is no safe path. Open storm drains and displaced manhole covers become hidden hazards. Fast-moving water near culverts and crossings can knock people off their feet or pull them into the system.
There have been injuries. There have been lives lost.
Infrastructure itself is damaged—roads undermined, pipes exposed, systems compromised. Cleanup becomes a recurring burden. Businesses are disrupted. Public funds are redirected toward emergency response instead of long-term solutions.
Rebuilding the Same System
After each major event, the response follows a familiar pattern.
Damage is assessed. Emergency funding is requested. Cleanup begins. Repairs are made.
And what is rebuilt is largely what existed before.
The same culverts. The same capacity. The same vulnerabilities.
The system is restored, but it is not strengthened.
A Watershed That Has Not Changed
The watershed itself remains the same. Water continues to move from Haleakalā to the sea, through gulches, across the floodplain, and into wetlands and coastal outlets.
What has changed is how much space that system has to function, and how little infrastructure has been built to support it.
The result is predictable.
A Disaster Shaped by Decisions
Extreme weather is natural. Heavy rainfall is part of South Maui’s climate. Kona storms will continue to occur.
The scale of the damage is shaped by human decisions—how land is used, how infrastructure is designed, and whether known solutions are implemented.
When the entire watershed is activated and the system is underbuilt, the outcome is not unexpected.
The water does what it has always done.
Now Is the Time to Act
The extreme floods of March 2026 have made the limits of the current system clear. The studies have already been completed. The risks have already been identified. The solutions are already known.
Now is the time for the community to push for follow-through.
That means demanding implementation of the Kihei Drainage Master Plan and related watershed solutions. It means investing in infrastructure that is designed for the realities of today and the intensifying storms of the future. It means protecting gulches, floodplains, and wetlands as essential components of the system, not leftover land.
Capacity costs money. But the cost of inaction is already being paid—by homeowners, by businesses, and by the community as a whole.
South Maui cannot continue to rebuild the same system and expect a different result.
The next storm will come. The only question is whether the system will be ready for it.
