Wailuku Water Reservoir 6 Reservoir Report

Last Updated: December 20, 2025

Wailuku Water Reservoir 6, also known as Kama Ditch, is a private water resource located in Waikapu, Maui, Hawaii.


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Summary

This reservoir serves primarily for irrigation purposes, storing a maximum of 56 acre-feet of water with a normal storage capacity of 35 acre-feet. The dam, standing at a height of 33 feet and a length of 1150 feet, is classified as an earth dam with a buttress core type.

Despite its fair condition assessment and high hazard potential, Wailuku Water Reservoir 6 is regulated by the Hawaii Department of Land and Natural Resources, with state permitting, inspection, and enforcement in place. The last inspection in June 2015 reported the reservoir's condition as fair, with a moderate risk assessment rating. The spillway type is noted as uncontrolled, with a width of 6 feet, presenting a potential risk factor in emergency situations.

Overall, Wailuku Water Reservoir 6 plays a crucial role in the irrigation system of the region, providing water storage for agricultural purposes. As a significant water resource in Maui, it is essential for water and climate enthusiasts to monitor and support the maintenance and regulation of this reservoir to ensure its continued functionality and safety for the surrounding community.

Dam Length

1150

Dam Height

33

Primary Dam Type

Earth

Surface Area

5.9

Drainage Area

0.12

Nid Storage

56

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

33
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.