EWA WATERSHED MANAGEMENT PLAN COMMUNITY MEETING #2 November 19, - - PowerPoint PPT Presentation

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EWA WATERSHED MANAGEMENT PLAN COMMUNITY MEETING #2 November 19, - - PowerPoint PPT Presentation

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EWA WATERSHED MANAGEMENT PLAN COMMUNITY MEETING #2 November 19, 2014 Honolulu Board of Water Supply Department of Planning and Permitting Agenda Introduction Ewa Water Resources Ewa Water Systems Ewa Water Demand

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ʻEWA WATERSHED MANAGEMENT PLAN

COMMUNITY MEETING #2 November 19, 2014

Honolulu Board of Water Supply Department of Planning and Permitting

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 2

Agenda

  • Introduction
  • ʻEwa Water Resources
  • ʻEwa Water Systems
  • ʻEwa Water Demand
  • ʻEwa WMP Objectives and Sub-Objectives
  • Potential Water Supply Options for ʻEwa
  • ʻEwa WMP: Next Steps
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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 3

Introduction: ʻEwa’s Water Story

ʻEwa, like all regions, has water challenges…

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 4

Introduction: ʻEwa’s Water Story

…but ʻEwa has a special water history… …and an opportunity for a model water future…

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 5

Introduction: ʻEwa’s Water Story

…so how will the ʻEwa community respond?

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 6

Introduction: Watershed Management Plans

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 7

Introduction: Watershed Management Plans

THE PUBLIC TRUST

“The State has an obligation to protect, control and regulate the use of Hawaii’s water resources for the benefit of its people.”

  • State Constitution, Article XI, Section 7 (1978)

There are four identified public trust purposes, as determined by the Hawaiʻi Supreme Court: 1) resource protection; 2) domestic water use; 3) Native Hawaiian traditional and customary rights; and 4) Department of Hawaiian Home Lands (DHHL) reservations.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 8

Introduction: Watershed Management Plans

  • County “Water Use and Development Plans” are

required by the State Water Code

  • “Oʻahu Water Management Plan” is required by Revised

Ordinances of Honolulu Chapter 30

  • Honolulu Plans are district specific and called

“Watershed Management Plans” (WMPs).

  • Guidance is provided by the Hawaiʻi Water Plan and the

City’s ʻEwa Development Plan.

  • District-level water and land use plans allow for

community-specific actions and strategies

  • WMPs require approval by BWS, DPP, City Council, and

CWRM

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 9

Introduction: Watershed Management Plans

State Water Code Oahu General Plan

Koʻolau Loa Waiʻanae Koʻolau Poko North Shore ʻEwa Central Oʻahu PUC East Honolulu

Oahu Water Management Plan 8 Watershed Management Plans By DP/SCP District

  • Act 152: Watershed Protection
  • Waiāhole Ditch Decision
  • Ch 30, ROH Water Management
  • BWS Sustainability Mission

8 DP/SCP Land Use Plans Hawaii Water Plan

  • State Water Projects Plan
  • Agricultural Water Use and

Development Plan

  • Water Quality Plan
  • Water Resource Protection Plan
  • County Water Use and Development

Plans

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 10

Introduction: WMP Goal

To formulate an environmentally holistic, community based, and economically viable watershed management plan that will provide a balance between:

1. The protection, preservation, and management of Oʻahu’s watersheds 2. Sustainable ground and surface water use and development to serve present users and future generations.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 11

Introduction: WMP Objectives

  • 1. Promote sustainable watersheds;
  • 2. Protect and enhance water quality and quantity;
  • 3. Protect Native Hawaiian rights and traditional

and customary practices;

  • 4. Facilitate public participation, education, and

project implementation; and

  • 5. Meet future water demands at reasonable

costs.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 12

Introduction: 1st Community Meeting

  • May 2013
  • Purposes:

– Share preliminary research on ʻEwa – Discuss water resource Issues – Start the discussion on water demand and supply

  • Meeting notes and slideshow on-line at:

http://www.hbws.org/cssweb/display.cfm?sid=125018

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 13

Introduction: 1st Community Meeting

  • Issues and questions raised:

– Protect traditional and customary practices – Desalinated water: what will it be used for? – What is the state of the BWS water system in ʻEwa? – Non-BWS water systems need to be accounted for – Is there enough water for planned development? – Is our drinking water safe? – What are the flooding issues? – Education and community engagement is important – Land use and water planning needs to be integrated

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 14

Introduction: The ʻEwa District

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 15

Introduction: ʻEwa History

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 16

Introduction: ʻEwa’s Sugar History

Source: Wilcox, Carol. 1996. “Sugar Water: Hawaii’s Plantation Ditches”

Drilling an artesian well in ʻEwa c. 1890

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 17

Introduction: ʻEwa’s Sugar History

  • c. 1988

Approximately 13,500 acres

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 18

Introduction: Full Buildout of Master Plans

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 19

ʻEwa Water Resources: Hydrologic Cycle

Northeast Trades Precipitation

Percolation

Evaporation

Transpiration Streams

Spring Spring Spring

Dike Confined Water Freshwater Aquifer

CAPROCK SEA LEVEL

Salt Water Salt Water

Perched Water

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 20

ʻEwa Water Resources: Geology

  • Impermeable caprock holds the fresh basal water

inland.

  • Caprock also holds water from rainfall and leakage

from the basal aquifer in its limestone layers

Brackish Water Lens Salt Water

Rainfall

Leakage from the basal aquifer to the caprock aquifer

Rainfall

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 21

ʻEwa Water Resources: Climate

  • Low rainfall

– Average annual rainfall = 20” - 40” – Average annual rainfall

  • n Oʻahu = 20” – 300”

– Average annual rainfall for the State = 10” – 440”

  • Within the district,

rainfall decreases when going mauka to makai

  • Average temperatures:

60˚ to 91˚

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 22

ʻEwa Water Resources: Climate Change

  • Rainfall (-15% over the past 20 years) and stream

discharge have decreased1

  • Air temperature is increasing

(0.3oF/decade over the past 30 years)1

  • Rainstorm intensity has increased (+12%, 1958-2007)1
  • Sea surface temperature is rising

(0.22oF/decade over the past 30 years)2

  • Ocean has grown more acidic
  • Sea level is rising

1 Fletcher, Chip. 2010. Hawaiʻi’s Changing Climate Briefing Sheet. School of Ocean and Earth Science and Technology, University of Hawaiʻi at Mānoa. Center for Island Climate Adaptaon and Policy. 2 Keener, V.W., J.L. Marra, M.L. Finucane, D. Spooner, M.H. Smith. 2012. Pacific Islands: Indicators and Impacts. Report for the 2012 Pacific Islands Regional Climate Assessment. Washington, D.C: Island Press.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 23

ʻEwa Water Resources: Climate Change

30‐yr change = +0.9°F 30‐yr change = +1.4°F

Giambelluca, T.W., Diaz, H. F., and Luke, M.S.A. 2008. Secular temperature changes in Hawaiiʻ. Geophysical Research Letters, Vol. 35, L12702, doi;10.1029/2008GL034377.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 24

ʻEwa Water Resources: Climate Change

Giambelluca, et. al. 2011. Regional Climate Trends in Hawaii. American Geophysical Union Fall Meeting. Abstract GC21B‐0898.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 25

ʻEwa Water Resources: Climate Change

Low‐lying areas that may flood Global mean sea level may rise by three feet by the end

  • f the Century. (SOEST, UH Mānoa)

Three‐foot SLR would start to impact the coasts and low‐ lying areas may flood since there is nowhere for the water to go. (NOAA SLR and Coastal Flooding Viewer http://coast.noaa.gov/slr/) Coastal areas inundated

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 26

ʻEwa Water Resources: Geology

  • As sea level rises, salt water pushes the basal

aquifer inland

Basal aquifers

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 27

ʻEwa Water Resources: Ground Water

  • Sustainable Yield (SY): the maximum rate at

which water may be withdrawn without impairing the utility or quality of the water source as determined by CWRM.

  • Ground Water Management Area: special areas

where additional regulation is required

– The Pearl Harbor Aquifer Sector Area is a Ground Water Management Area. – A CWRM water use permit is required for all ground water uses.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 28

ʻEwa Water Resources: Ground Water

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 29

ʻEwa Water Resources: Surface Water

  • One (1) perennial

Stream

  • 16 dry streams or

gulches

  • Wetlands in the

Honouliuli and Kalaeloa units of the Pearl Harbor National Wildlife Refuge

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 30

ʻEwa Water Resources: Drainage and Flooding

http://archives.starbulletin.com/96/11/06/news/story2.html

Renton Road, 1996

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 31

ʻEwa Water Resources: Implications

  • Ground water must be managed wisely

– The availability of ground water in the ʻEwa district is limited and protected by City, State, and federal regulation. – Ground water quality is susceptible to impacts from surrounding land uses.

  • Surface water should be maintained for

ecological and cultural purposes

– There are few surface water resources that are capable of supplying water for human use. – Surface water resources are of both ecological and cultural significance.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 32

ʻEwa Water Systems: System Owners

  • City and County of

Honolulu

– Honolulu BWS

  • State of Hawaiʻi

– Agribusiness Development Corporation (ADC) – Hawaiʻi Housing Finance and Development Corporation (HHFDC)

  • Federal

– Kalaeloa Water System – U.S. Navy – USFWS

  • Private

– Individual non-potable wells

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 33

ʻEwa Water Systems: Honolulu BWS

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 34

ʻEwa Water Systems: Honolulu BWS

2013

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 35

ʻEwa Water Systems: Honolulu BWS (2010)

Agriculture 0.165 mgd 1% Commercial 2.879 mgd 19% Residential 9.307 mgd 62% Hotel/Resort 0.106 mgd 1% Industrial 1.528 mgd 10% Golf Course & Landscape Irrigation 0.541 mgd 4% Religious 0.018 mgd 0% City Government 0.077 mgd 1% State Government 0.329 mgd 2% U.S. Government, Non‐Military 0.027 mgd 0% Other 0.002 mgd 0% Trasfer to Waiʻanae, 5.20, 24%

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 36

ʻEwa Water Systems: Recycled Water

Honouliuli Water Recycling Facility

  • BWS purchased facility

in 2000 from US Filter

  • R-1 Quality Water

(10 mgd capacity)

– Landscape irrigation – Golf Course Irrigation – Dust Control – Honouliuli WWTP

  • R-O Quality Water

(2 mgd capacity)

– Refineries – Power Plants

Source: Hawaii Water Reuse Survey and Report (2005)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 37

ʻEwa Water Systems: Recycled Water

Existing Leeward Oahu Projects Future Leeward Oahu Projects

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 38

ʻEwa Water Systems: Waiāhole Ditch

USE ALLOCATION (2010, mgd) Water Returned to Windward Streams 12.0 Permitted Offstream Uses (mostly in Central Oʻahu) 12.991 Unallocated Water 2.009 TOTAL 27.0

ʻEwa District

Source: State Department of Agriculture

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 39

ʻEwa Water Systems: Other State Systems

  • HHFDC (non-potable)

– Landscape Irrigation (0.34 mgd) (2010)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 40

ʻEwa Water Systems: Kalaeloa Water System

Existing Potable Water System

Pipe alignments are approximate Final EIS for the Disposal and Reuse of Naval Air Station Barbers Point, Hawaii 1999)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 41

ʻEwa Water Systems: Kalaeloa Water System

  • Current Owner: US Navy
  • Probable Future Owner: Pural Water Specialty Co.
  • Source: Barber’s Point Shaft

– Water Use Permit Amount: 2.337 mgd – 2010 Pumpage: 1.31 mgd

  • Uses

– Residential – Other non-residential – Irrigation/non-potable

  • HCDA

– Oversees the redevelopment of Kalaeloa – Approves infrastructure plans within the Kalaeloa Community Development District

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 42

ʻEwa Water Systems: Federal Non-Potable Wells

  • U.S. Navy

– 2010 Withdrawal: 0.19 mgd – Use: Agriculture

  • USFWS

– 2010 Withdrawal: 0.08 mgd – Use: Irrigation at the Pearl Harbor NWR

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 43

ʻEwa Water Systems: Private Non-Potable Wells

  • Agriculture

– 2010 Withdrawal: 3.20 mgd

  • Industrial

– 2010 Withdrawal: 2.99 mgd

  • Irrigation (golf course)

– 2010 Withdrawal: 3.38 mgd

  • Irrigation (other landscape)

– 2010 Withdrawal: 0.66 mgd

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 44

ʻEwa Water Systems: Opportunities

  • Of all Oʻahu Districts, ʻEwa has the greatest
  • pportunity for diversification of water sources
  • ʻEwa has master planned its growth for decades

with recycled water and dual plumbing

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 45

ʻEwa Water Demand: Uses

  • Domestic Residential
  • Domestic Non-Residential
  • Agriculture
  • Irrigation
  • Industrial
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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 46

ʻEwa Water Demand: Existing (2010)

Water Use Category Water Demand (CY 2010, mgd) Domestic Residential 14.59 Domestic Non‐Residential 3.72 Industrial1, 2 7.24 Agriculture 4.01 Irrigation2 9.20 Other 0.00 TOTAL 40.41

1 Industrial water demands do not include demands for salt water. 2 Industrial and irrigation demands include demands for recycled water.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 47

ʻEwa Water Demand: Existing (2010)

Ground Water (Fresh Water Aquifer) 13.66 (34%) Ground Water (Brackish Caprock Aquifer) 6.69 (17%) Waiahole Ditch Irrigation System, 3.64 (9%) BWS Import 8.02 (20%) Recycled Water (R‐1) 7.01 (17%) Recycled Water (R‐0) 1.39 (3%)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 48

ʻEwa Water Demand: Projections

Why project future water demand?

  • To determine how much water

may be needed in the future

  • To indicate when increased

demands might require infrastructure upgrades

  • To provide guidance for

responsible land and water use decisions

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 49

ʻEwa Water Demand: Projection Methodology

Per Capita Method

Determine the average water use per person by dividing the current water demand by the current population served by that water system. Apply the per person water demand to the projected population.

Water Demand Person Total BWS Water Demand Total BWS-Served Population = = Per capita demand People served by BWS in CY 2035 Per capita demand X = BWS water demand in CY 2035

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 50

ʻEwa Water Demand: Projection Methodology

End Use Inventory Method

Land use based. Estimates water demand by type of land use: e.g. agriculture, other landscape irrigation, etc. Acres of land use Total water demand for that particular land use Apply the per unit water demand to the projected increase of the water use sector. Per acre water demand factor

X =

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 51

ʻEwa Water Demand: Projection Guidelines

  • The Statewide Framework for Updating the

Hawaiʻi Water Plan (Statewide Framework)

  • Project for all water producers: BWS, Federal,

State, and Private

  • Develop “a range of forecasts” – three scenarios

(1) Low - growth (2) Mid – growth (City projections based on policy) (3) High – growth

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 52

35,709 42,983 68,696 82,595 101,397 115,887 130,377 144,866 159,356 173,846 256,938

‐ 50,000 100,000 150,000 200,000 250,000 300,000

1980 1990 2000 2005 2010 2015 2020 2025 2030 2035 Ultimate

ʻEwa Water Demand: Projected Population

Population Actual Population (Census)

ʻEwa General Plan Target Population (13% of Oʻahu’s projected 2025 population)

Projected Population (City) Projected “Ultimate” Population (ʻEwa WMP) Year

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 53

ʻEwa Water Demand: Projection Scenarios

Scenario Description Population Increase 2010 ‐ 2035 Low‐Growth ʻEwa does not develop into the Secondary Urban Center and Oʻahu residents connue to work and reside in the Primary Urban Center. + 43,469 people Mid‐Growth City population projections based on the General Plan and ʻEwa Development Plan recognize that Kapolei becomes the Secondary Urban Center of Oʻahu. + 72,449 people High‐Growth The Second City of Kapolei has come into its

  • wn. ʻEwa is a successful job center and

Kalaeloa is being developed. + 120,748 people Ultimate‐Growth Kapolei and Kalaeloa rival Downtown Honolulu as job centers and all planned residential units have been developed. + 155,541 people (2010 ‐ ~2080)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 54

ʻEwa Water Demand: Population Projections

Growth Scenario

50,000 100,000 150,000 200,000 250,000 300,000 Low Mid High Ultimate

Population Year

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 55

Water Demand Projections: BWS Potable

7.8 10.60 15.30 17.367 18.05 18.75 20.75 22.76 24.76 26.76 y = 1E+13e‐0.012x R² = 0.8876 50,000 100,000 150,000 200,000 50 100 150 200 250 300 350 400 1970 1980 1990 2000 2010 2020 2030 2040 2050 Population Per Capita Demand [GPCD] & Demand [MGD] Calendar Year

Ewa GPCD Trend

GPCD Demand BWS Served Resident Population

  • Expon. (GPCD)
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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 56

Water Demand Projections: BWS Potable

Scenario 2035 BWS Served Population (mgd) Projected Water Demand (mgd) Existing (2010) 92,174 16.2 Low (2035) 128,964 22.2 Mid (2035) 154,741 26.4 High (2035) 197,732 33.4 Ultimate (~2080) 228,701 38.1

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 57

Water Demand Projections: Kalaeloa Water System

Scenario Basis Water Demand (mgd) Existing (2010) Reported Water Use 1.31 Low (2035) Phase I of the Kalaeloa Master Plan (KMP, 2006) has been implemented by the year 2035. 1.40 Mid (2035) Phases I and II of the KMP have been implemented by the year 2035. 2.55 High (2035) Phases I, II, and III of the KMP have been implemented by the year 2035. 3.29 Ultimate (~2080) Phases I, II, III, and IV of the KMP have been implemented by the year 2035. 4.21

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 58

Water Demand Projections: Agriculture

Scenario Basis Acres Water Demand (mgd) Existing (2010) 3,539 7.04 Low (2035)

UH West Oʻahu and DHHL East Kapolei have displaced some existing agriculture within the Community Growth Boundary.

3,057

‐481 acres from 2010

5.40 Mid (2035)

All ag lands within the Community Growth Boundary have been converted to urban uses, except for Hoʻopili’s ag component.

2,859

‐680 acres from 2010

4.72 High (2035)

Same as mid‐growth scenario, but additional ag lands in US Navy ESQD zone are fully cultivated.

2,960

‐579 acres from 2010

5.07 Ultimate (~2080)

Same as mid‐growth scenario, but additional ag lands at UH West Oʻahu’s mauka campus are fully cultivated.

3,408

‐131 acres from 2010

6.06

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 59

Water Demand Projections: Industrial

Scenario Basis Acres Water Demand (mgd) Existing (2010) 1,686 7.24 Low (2035)

Portions of Kenai Industrial Park, Kalaeloa Barbers Point Deep Draft Harbor, Kapolei Harborside, and Kalaeloa are developed.

1,899

(+214 acres)

8.16 Mid (2035)

Implementation of additional phases of the industrial parks developed under the low –growth scenario.

2,123

(+437 acres)

9.12 High (2035)

Implementation of additional phases of the industrial parks developed under the mid –growth scenario. Implementation of Hoʻopili’s plans for light industry.

2,370

(+685 acres)

10.18 Ultimate (~2080)

Complete implementation of all planned industrial parks, including Hoakalei Marina.

2,634

(+949 acres)

11.31

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 60

Water Demand Projections: Golf Course Irrigation

Scenario Basis Water Demand (mgd) Existing (2010) There are currently nine existing golf courses in the ʻEwa District. 7.45 Low (2035) No change in the number of golf courses in the ʻEwa District. 7.45 Mid (2035) No change in the number of golf courses in the ʻEwa District. 7.45 High (2035) Kapolei West Golf Course has been built as the tenth golf course in the ʻEwa District. 8.35 Ultimate (~2080) Global climate change assumes declining rainfall and increased evapo‐transpiration rates due to higher temperatures, thus increasing irrigation rates by 15% for the 10 golf courses in ʻEwa. 9.60

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 61

Water Demand Projections: Landscape Irrigation

Scenario % Increase in Population by 2035 Water Demand (mgd) Existing 2010) N/A 1.16 Low (2035) + 43% 1.66 Mid (2035) + 71% 1.99 High (2035) + 119% 2.55 Ultimate (~2080) + 153% 3.39

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ʻEwa Water Demand: Projections: Summary

40.41 46.25 52.21 62.79 72.62

0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 Baseline (2010) Low Mid High Ultimate

Demand Scenario Water Demand (mgd)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 63

ʻEwa Water Demand Projections: Summary

0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 Municipal Agricultural Industrial Irrigation TOTAL Baseline (2010) Low (2035) Mid (2035) High (2035) Ultimate (~2080)

Water Use Sector Water Demand (mgd)

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 64

ʻEwa WMP Objectives and Sub-Objectives

  • OBJECTIVE #1: Promote sustainable

watersheds

  • a. Maintain and enhance the forests within the State

Conservation District

  • b. Protect native plant and wildlife habitat
  • c. Mitigate the impact of planned development within

the Community Growth Boundary

  • d. Provide for agricultural water needs
  • e. Retain drainageways as natural channels
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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 65

ʻEwa WMP Objectives and Sub-Objectives

  • OBJECTIVE #2: Protect and enhance water

quality and quantity

  • a. Maximize ground water infiltration
  • b. Conserve and reuse water to make the most

efficient use of district water supplies and reduce the amount of effluent that is disposed of offshore

  • c. Implement regional drainage plans to mitigate

flooding and reduce point and non-point source pollution of the ocean and Pearl Harbor

  • d. Protect the quality of the drinking water aquifer
  • e. Sustain the brackish caprock aquifer
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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 66

ʻEwa WMP Objectives and Sub-Objectives

  • OBJECTIVE #3: Protect Hawaiian rights and

traditional and cultural practices

  • a. Preserve and provide access to sites and resources

in ʻEwa that are important to Hawaiian history and cultural practices

  • b. Protect the gathering of natural resources in the

ʻEwa coastal zone by understanding the role that fresh water and land use plays in the health of near shore waters

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 67

ʻEwa WMP Objectives and Sub-Objectives

  • OBJECTIVE #4: Facilitate public participation,

education, and project implementation

  • a. Provide opportunities for the community to

participate in the management of ʻEwaʻs cultural and natural resources

  • b. Provide opportunities for the community to learn

about ʻEwa water resources and how to protect them

  • c. Collaborate amongst government agencies, non-

profit entities, and community on issues related to ʻEwa's long-term land and water resources future

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 68

ʻEwa WMP Objectives and Sub-Objectives

  • OBJECTIVE #5: Meet future water demands at

reasonable costs

a. Diversify Ewa's water supply to ensure that there will be enough potable water for potable needs and to allow for adequate water supply for all types of water demands b. Improve the efficiency of water system delivery c. Research climate change impacts and pursue adaptation and infrastructure resiliency strategies d. Incorporate renewable energy and energy efficiency strategies into all water systems e. Sustain the brackish caprock aquifer f. Maintain reasonable costs to consumers

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 69

Potential Water Supply Options: Framework

Desalted Water Recycled Water Conser‐ vation Surface Water Ground Water Domestic

(Residential, Commercial, etc.)

Industrial Landscape Irrigation Agriculture Traditional & Customary Practices Natural Resource Protection Storm Water

In‐district Potable In‐district Non‐ Potable Imported Potable Imported Non‐ Potable (WDIS)

In situ uses

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 70

ʻEwa WMP Next Steps: Projects and Strategies

Projects with Champions

Specific projects that are being planned and/or that are being implemented by a particular agency or agencies or by a particular group or non-profit entity.

Strategies

Potential actions that would serve to implement the

  • verall goal, objectives, and sub-objectives of the

KPWMP, but that do not currently have a project champion.

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 71

ʻEwa WMP Next Steps: Nov 2014 through Sep 2015

  • Develop project and strategy

descriptions

  • Dra ʻEwa Watershed Management

Plan

  • Public Review of Dra ʻEwa WMP
  • Approvals Process: City Council &

Water Commission

  • Final ʻEwa Watershed Management

Plan

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ʻEwa Watershed Management Plan * Community Meeting #2 * November 19, 2014 * Honolulu Board of Water Supply * 72

ʻEwa WMP Contact Information

Sherri Hiraoka Townscape, Inc. sherri@townscapeinc.com (808) 536-6999, ext. 6 Barry Usagawa Honolulu Board of Water Supply busagawa@hbws.org (808 748-5900