“The true measure of any society can be found in how it treats its most vulnerable members.” ~ Mahatma Gandhi

1. MAUI COUNTY
DEPARTMENT OF WATER SUPPLY
FLIGHT OF THE BUMBLEBEES – PART III
AVAILABILITY OF WATER
EAST MAUI WATERS CENTRAL MAUI (KAHULUI & WAILUKU)
TRANSPORT & DELIVERY
EAST MAUI IRRIGATION (EMI)
WATER RESOURCE ADEQUACY
Comparing available resources to future demand and needs, long-term resource
supply must be adequate to meet projected demand while maintaining
watershed, stream and aquifer sustainability and replenishment. Resource
adequacy means not just having enough water, but adequate quality of water
for diferent types of needs, such as potable and irrigation uses.
CONVENTIONAL WATER SOURCE AVAILABILITY AND UNCERTAINTIES
Groundwater
Available groundwater is defned on a state level as sustainable yield and
further restricted in groundwater management areas by water use permit limits.
Except for the designated Iao groundwater management area, few aquifers on
the island are developed to more than a fraction of sustainable yield.
{G]roundwater pumpage exceeding sustainable yield in Paia and Kahului
aquifers of the Central Sector were a result of surface water import, both
which signifcantly decreased with the cessation of sugarcane cultivation
[Hawaiian Commercial & Sugar Company (HC&S)].
[Emphasis and Clarifcation Supplied]
Source: Maui County Department of Water Supply 2014 Department of Health
Water Quality Plan Draft Accessed January 6, 2018
https://www.mauicounty.gov/DocumentCenter/View/108979
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2. HC&S depend(ed) on three water systems to meet its water needs:
1. The East Maui Irrigation (EMI) ditch system which collects water from
the windward slopes of Haleakala;
2. The West Maui ditch system, co-owned and operated by HC&S and
Wailuku Water Co., which collects water from four streams originating from the
West Maui mountains; and
3. A system of 15 brackish water wells.
HC&S' sister company, East Maui Irrigation (EMI), operates a ditch system
which collects surface water (rainfall) on the east side of the island and delivers it to:
1. HC&S' felds in Central Maui, and
2. County Department of Water Supply, which in turn treats and provides the
water to Upcountry farmers and residents.
The WEST MAUI DITCH SYSTEM collects water from the Iao, Waihee, Waiehu
and Waikapu streams. It is co-owned and operated by HC&S and Wailuku
Agribusiness.
HC&S utilizes a battery of 15 BRACKISH WATER WELLS to supplement its ditch
systems, when insufcient surface water is available.
[Emphasis and Clarifcation Supplied]
Source: HC&S. Accessed January 6, 2018. http://hcsugar.com/keeping-maui-green/water-conservation/
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Hawaii State Department of Agriculture Map – East Maui Irrigation System
https://hdoa.hawaii.gov/arm/fles/2012/12/Map11.pdf
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3. UPCOUNTRY REGION (CENTRAL AND KO`OLAU AQUIFER SECTORS)
Broken down by hydrologic units, the Upcountry region spans two aquifer
sectors: the Central and Ko`olau sectors.
The municipal Upcountry water system hydrologically links Pa`ia,
Kamaole, Makawao and Ha`iku aquifers with surface water from the
Ke`anae, Waiakamoi and Honopou aquifer system.
Agricultural irrigation and related use for sugarcane cultivation accounted
for 57.3 mgd of the reported 59.5 mgd pumpage from the Kahului and
Pa`ia aquifers. Transfers of surface water from the Ko‘olau aquifer sector
contribute to recharge of these aquifers.
CENTRAL SECTOR SUSTAINABLE INSTALLED PUMP REPORTED PUMPAGE
YIELD (MGD) CAPACITY (MGD) (MGD)
Makawao 7 4.961 0.36
Kamaole 11 18.827 2.85
Kahului 1 102.121 29.99
Pa`ia 7 153.728 29.50
TOTAL SECTOR SY 26 279.637 62.72
Notes, Supplied: 1. Makawao, Kamaole and Pa`ia are in the Hamakuapoko Watershed,
adjacent to the Hamakualoa and Ko`olau Watersheds 2. Kahului is in the Wailuku
Watershed
KO`OLAU SECTOR SUSTAINABLE INSTALLED PUMP REPORTED PUMPAGE
YIELD (MGD) CAPACITY (MGD) (MGD) 2.85
Ke`anae 83 1.148 0.06
Ha`iku 27 12.477 0.83
Honopou 25 0.689 0.01
Waikamoi 40 0 0
TOTAL SECTOR 175 14.314 0.91
Source: Maui County. Upcountry Region (Central and Ko`olau Aquifer Sectors) Accessed
January 6, 2018. https://www.mauicounty.gov/DocumentCenter/View/104325

4. THE DEWATERING OF EAST MAUI CONTINUES
MONTHY WATER PRODUCTION
EAST MAUI GROUNDWATER - 2017
Previous
12 Mo
10/16 11/16 12/16 1/17 2/17 3/17 4/17 5/17 6/17 7/17 8/17 9/17 Average
528MG 561MG 252MG 449MG 385MG 396MG 386MG 424MG 414MG 336MG 291MG 284MG 388MG
Source: Maui County Department of Water Supply. Monthly Water Production
Accessed January 6, 2017 https://www.mauicounty.gov/572/Monthly-Water-Production
MAUI TARO - KEKONA ART
ISLAND TIME, KULA, MAUI