in june 18,files.hawaii.gov/dlnr/cwrm/submittal/2019/sb20190618c1.pdfjun 18, 2019 · presentation...
TRANSCRIPT
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Briefing in Waimea
June 18, 2019
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C W R M B r i e f i n g i n W a i m e a , H a w a i‘ i I s l a n d – J U N E 1 8 , 2 0 1 9 2
Presentation Outline
• Introduction & Background of WRPP
•Updated information on Ground Water Management
•Proposed amendments to Waimea/ ‘Anaeho‘omalu Aquifer System Area
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C W R M B r i e f i n g i n W a i m e a , H a w a i‘ i I s l a n d – J U N E 1 8 , 2 0 1 9 3
Presentation Outline
• Introduction & Background of WRPP
•Updated information on Ground Water Management
•Proposed amendments to Waimea/ ‘Anaeho‘omalu Aquifer System Area
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CWRM Vision
Flowing streams,
sustainable aquifers,
and functioning watersheds
for the use, enjoyment, and benefit of all.
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CWRM MissionTo protect and manage
the waters of the State of Hawaiʻi
for present and future generations.
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Hawaiʻi Water Plan
AgriculturalWater Use and Development
Plan
State Water Projects Plan
Water Quality Plan
CountyWater Use and Development
Plans
County‐Wide
Demands
State Needs
Land Use Consistency
Protection Policies
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Water Resource
Protection Plan
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Water Resource Protection Plan• Nature and occurrence of water
• Hydrologic units and their characteristics
• Existing and contemplated uses of water
• Programs to conserve, augment, regulate and protect the resource
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Background/History/Timeline
• Initial adoption: 1990
• First update: 1992
• Most recent update: 2008
• Current draft update: 2019 (July)
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C W R M B r i e f i n g i n W a i m e a , H a w a i‘ i I s l a n d – J U N E 1 8 , 2 0 1 9 9
Presentation Outline
• Introduction & Background of WRPP
•Updated information on Ground Water Management
•Proposed amendments to Waimea/ ‘Anaeho‘omalu Aquifer System Area
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Groundwater Management
Sustainable limits for each management unit
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Groundwater Management
Sustainable limits for each management unit
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Aquifer System Areas• Waimea• ‘Anaeho‘omalu
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Groundwater Management5000 Wells in State
1,342 Wells on Hawai’i
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80 Wells in Waimea ‘Anaeho‘omalu ASAs
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Groundwater Management
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51 Wells in Waimea
2008 SY = 24
2019 SY = 16
12 MAV = 12.5 mgd
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29 Wells in ‘Anaeho‘omalu
Groundwater Management2008 & 2019 SY = 30
12 MAV = 5.5 mgd
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Groundwater Management
5 Observation Wells in Region
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Groundwater Management
Deep Monitor Well
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Groundwater Management (Deep Monitor Data )
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Groundwater Management
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• How does CWRM estimate Sustainable Yields?
• Use best public information available • RAM• RAM2• Numerical Models and other public studies
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What is RAM?
Robust Analytical Model (RAM)(Mink, J.F. 1981.Determination of Sustainable Yields, in:Groundwater in Hawaii – A Century of Progress, Water Resources Research Center, University of Hawaii)
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Conceptual RAM Model
Ocean
MSL
Fresh water
Sea water
Water table
Sea Level
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Conceptual RAM Model
y
z
x
Bh
h
h
INTERFACE
Sea LevelL = Q
Q Q = I ‐ D
Sea water
Fresh water
Water table
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Conceptual RAM Model
y
z
x
Bh
h
h
INTERFACE
Sea LevelL = Q
Q Q = I ‐ D
Sea water
Fresh water
Water table
By combining Darcy’s Law, conservation of mass, and GH principle ‐ RAM Model:
IhhDI
VttIDI
IhhDI
IhhDI
VttIDI
IhhDI
DDIhh
iiii
iiii
i
00
1
0
00
1
001
)()(2exp][
)()(2exp][Solution:
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John Mink’s Robust Analytical Model (RAM)(Mink, J.F. 1981.Determination of Sustainable Yields, in:Groundwater in Hawaii – A Century of Progress, Water Resources Research Center, University of Hawaii)
D = I{1 – (h/H)2}D = allowable draft (i.e. sustainable yield)I = RechargeH = original head before pumping (important calibration point)h = equilibrium head
Limitations•Assumes uniform distribution (optimized) pumpage•Difficult, if not impossible, to define original & equilibrium head•Does not directly assess changes in chlorides or water levels at a specific well•Does not consider GDE impacts directly
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John Mink’s Robust Analytical Model (RAM)(Mink, J.F. 1981.Determination of Sustainable Yields, in:Groundwater in Hawaii – A Century of Progress, Water Resources Research Center, University of Hawaii)
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John Mink’s Robust Analytical Model (RAM)(Mink, J.F. 1981.Determination of Sustainable Yields, in:Groundwater in Hawaii – A Century of Progress, Water Resources Research Center, University of Hawaii)
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2011 USGS Hawai‘i Recharge Updates
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2019 WRPP Big Island SY
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Sustainable Yield Updates
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Presentation Outline
• Introduction & Background of WRPP
•Updated information on Ground Water Management
•Proposed amendments to Waimea/ ‘Anaeho‘omalu Aquifer System Area
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2019 WRPP Sustainable Yieldsmgd
Waimea 16 (reduced from 24)
‘Anaeho‘omalu 30 (unchanged from 1990)
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2019 WRPP Sustainable YieldsRecharge % of all inputs
Waimea 11.4‘Anaeho‘omalu 53.7
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2019 WRPP Sustainable YieldsRecharge % of all inputs
•Waimea, Hāwī, Mahukona 11•Honoka‘a, Paʻauilo, Hakalau 22-28•Remainder Big Isle 44-70
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Streams flowing into Waimea ASA
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2019 WRPP Sustainable YieldsMissing inputsLosing Streams into Waimea ASA mgd
•Waikoloa 5•Keanuimano 4•Hauani 1
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2019 Isotope Analysis(rainfall elevation origin)
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Boundary Geophysical Analysis
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Proposed amendment to 2019 WRPP
• Maintains minimum range of latest recharge/sustainable yields
• Appears more consistent with observed hydrogeologic data
• Simple management change to address perceived threat to Waimea from drastic lowering of SY without changing USGS analysis
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Proposed amendment to 2019 WRPPSchedule (subject to change)• June 18 ‐ brief CWRM on Waimea/‘Anaeho‘omalu boundary change
• July 2 ‐ Public Hearing Notice of WRPP amendment for W/A change
• July 16 ‐ Commission decision on entire final draft of 2019 WRPP
• October 3 ‐ Public Hearing in Waimea
• November 3 ‐ deadline for written comments on W/A boundary change
• December 17 ‐ Commission action on W/A boundary change
![Page 41: in June 18,files.hawaii.gov/dlnr/cwrm/submittal/2019/sb20190618C1.pdfJun 18, 2019 · Presentation Outline •Introduction & Background of WRPP •Updated information on Ground Water](https://reader033.vdocuments.net/reader033/viewer/2022050218/5f63d7afb3532e2e5c759b66/html5/thumbnails/41.jpg)
For more information:
WRPP Update Websitehttp://dlnr.hawaii.gov/cwrm/planning/hiwaterplan/wrpp/
C W R M B r i e f i n g i n W a i m e a , H a w a i‘ i I s l a n d – J U N E 1 8 , 2 0 1 9 41