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Stormwater Resilience and Flood Risk Management
Infrastructure
High
High
Planning
County
State
County & State
Private
Flood risk management
“Incentivize 100% stormwater control and infiltration (with simple vegetative swales) to eliminate brown water events that impact our reefs and to recharge the aquifer...”
Community Quote from Long-Term Planning Recovery Survey
Project Description
This project will increase the County’s capacity to handle floodwaters, making it more resilient to flood risk. It includes current projects like the Lahaina Town Drainage Master Plan Update (to address localized flooding in urbanized areas of Lahaina Town) and preliminary design for the flood control project (retention basins and diversion channels mauka of Lahaina Town). This project is supported through USDA Natural Resources Conservation Service’s (NRCS) Watershed and Flood Prevention Operations Program. The County DPW is the local sponsor with Stantec as contractor. The project is currently working on a supplementary environmental impact study since the original Environmental Impact Statement was written in the 1980s, and a hydrologic and hydraulic study. Once studies are completed, USDA NRCS and DPW will discuss the data, needs and how the Lahaina Watershed can address the needs through feasible conservation practices, either structural or non-structural.
Purpose
This project will implement holistic stormwater and flood management, minimize stormwater runoff into the ocean and manage floodwaters across West Maui.
Interdependencies and Roadblocks
This project aligns with the current effort to develop a watershed management plan for Kahoma and Kaua’ula watersheds. Currently there is a lack of sponsorship for NRCS projects. The current contract NRCS has is for roughly $1.4 million, but with the additional scoping going on because of the fires there are going to be more funds needed. This project will have to compete nationally for design funding.
Next Steps
- Identification of funding source(s) and design
Project Details
Cost Estimate:
$TBD
Existing Funding Sources:
Project Lead:
County Department of Public Works
Potential Funding Sources:
Watershed Protection Grants Program
Project Partners:
- County Department of Agriculture
- State Department of Land and Natural Resources, Division of Aquatics Resources
- U.S. Army Corps of Engineers
- Environmental Protection Agency
- State Department of Health
- U.S. Department of Agriculture - Natural Resources Conservation Service
- State Department of Health, Surface Water Protection Branch
Alignment with West Maui Community Plan (WMCP)
- Goal 2.1 Ready and resilient systems
- WMCP Action 1.38 Update the Lahaina Town Drainage Master Plan for Low Impact Development (LID) and develop an implementation plan
- WMCP Action 1.39 Support the implementation of flood control projects and siltation basins mauka of Honoapi’ilani Highway, including the remaining phases of the Lahaina Watershed project to address problem areas.
- WMCP Action 1.40 Maintain a current inventory of drainage facilities in West Maui for use in developing long-term plans to address stormwater issues
- WMCP Action 1.41 Improve stormwater management systems along the Lower Honoapi’ilani Road to minimize stormwater runoff to the ocean.