HomeMy WebLinkAboutCouncil Presentation 08_24_2021 WaterResourcesTown of Marana -Water Resources
Management (Part I)
Designation of Assured Water
Supplies (DAWS) and Demands
Council Study Session
August 24, 2021
Jing Luo, PhD, PE
Marana Water Director
1
Outline
•Arizona Assured Water Supply Program
•Sources of Marana Water Supply
•Marana’s Water Demands
•Impact of Colorado River Water Shortage
•18-Year Ground Water Level Change
•2020 Marana Water Portfolio
•Next Steps
2
Arizona Assured Water Supply (AWS) Program
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•Authorized under the AWS Statutes (A.R.S. 45-576, Etc.) and Rules (A.A.C. R12-15-
701 Thru 730) to Address Limited Groundwater Supplies
•Developers/Designated Water Providers Must Demonstrate the Financial Resources,
Physical, Legal, and Continuous Access to Water of Sufficient Quality for 100 Years
•Must be Consistent with State’s Management Plan and Goal for the Active
Management Area (AMA)
•Administered by Arizona Dept. Of Water Resources (ADWR): Before Recording Plats
or Selling Parcels within an AMA, Developers must Demonstrate Assured Water
Supply
•The Arizona Dept. of Real Estate will Not Issue a Public Report, Which Allows Any
Developer to Sell Lots, without a Demonstration of AWS. (A.A.C. 12-15)
4
Marana Water Supply -Sources
Central Arizona Project (CAP)Reclaimed Water/Treated Effluent
Replenished Ground Water Long-term Storage Credit
Source Year Volume (AFY)
CMID Assignment
and Transfer 1999 47
FWID Assignment
and Transfer 2009 1,481
Avra Water Co-op
Assignment and
Transfer
2016 808
Total 2,336
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CAP water is imported for storage at GSF or USF, with water
recovery through Marana’s recovery wells.
Central Arizona Project (CAP) Water -M&I
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CAP Water Delivery Priority
•Plant Acquisition from Pima County in 2012
•New Water Reclamation Facility –1.5 MGD (1,681 AFY) in Operation 2018
•Recharge Project Completed 2018
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Reclaimed Water -Marana WRF
Replenished Groundwater
•Central Arizona Groundwater Replenishment District
(CAGRD)
•Groundwater Pumped in AMAs Must be Replenished
•CAGRD Commits to Replenishing Any Excess Groundwater Pumped by
Their Members for a Predetermined Rate.
•CAGRD Water Can be Used to Meet Existing and Future Demands
•1st Permanent Contract –December 12, 1995
•Allowable Groundwater
•Extinguishment Credits from Retired Farmlands
•Incidental Recharge = 4% of Water Used in the Previous Year
8
Long Term Storage Credit (LTSC)
•Any Excess Water can be
Recharged to Build up Long-term
Storage Credit
•16,861.36 AF Balance at the Time
of 2018 Designation
•14,827.28 AF Balance at the
Beginning of 2020
•LTSC Can be Created from CAP
Water or Effluent
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NIA Priority CAP Water -515 AFY
•NIA Reallocation Process Started in 2012:
•2014 ADWR Made Recommendation to the United States
•2019 Federal Finding of No Significant Impact was Submitted
•2021 Marana Subcontract Approved by Town of Marana Council
•Next Steps For NIA
•Finalize the Contract with CAP and U.S. Dept. of Interior
•Make Payments Per Payment Plan (5 Year)
•Pursue as an Addition to TOM’s Water Designation (ADWR)
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History of Marana Water Designation
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3,700
6,400
7,580
1,528
47
2,336
4,017
12
Percentage of Each Water Source
Total of
7,580 AFY
Current Water Demand
•9,132 Active Connections as
of Dec. 2020
•Water Produced vs. Delivered
in 2020
–2,788 AF Produced
–2,671 AF Delivered
–Avg. of 4.2% Lost/Unaccounted
13
14
Committed Water Demand
•“Committed Demand” -The 100-year water
demand at build-out of all recorded lots that are not
yet served water within the service area of a
designation applicant or a designated provider.
•“Committed” = “Platted and Vacant”
•2020 Committed Water Demand was 1,988 AFY
Projected Water Demand
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“Projected Demand”-The 100-year water demand at build-out,not including
committed or current demand,of customers reasonably projected to be added
and plats reasonably projected to be approved within the designated provider’s
service area and reasonably anticipated expansions of the designated
provider’s service area.
16
Designation of Assured Water Supply vs. Demands
CAP M&I
2,336 AFY
Reclaimed/Effluent
1,681 AFY
Ground Water
3,394 AFY
LTSC 169 AFY
Current Demand
2,788 AFY
9,200 EDUs
Committed Demand
1,988 AFY
6,560 EDUs
Remaining
2,804 AFY
9,300 EDUs
Total of 7,580 AFY
Impact of Colorado River Water Shortage
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18
CAP Water Cut under Different Tiers
Effective January 2022
18-year Ground Water Level Change (2000-2018)
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Oro Valley
NWRRDS
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Next Steps
•Proceed with Integrated Water Resources Planning
–Assess System Equity and Sustainability
–Identify and Evaluate System-wide/Regional Solutions
–Conduct Groundwater Modeling
–Update MW’s Drought Preparedness Plan
–Roll Out Community-wide Conservation Programs –ADWR Grant
–Advise Future Impact Fee Analysis
•Modify Assured Water Supply Designation –Extending the Planning Period to 15-20 Years
•Finalize NIA Subcontract and Payment Agreement
•Explore and Apply for Grant and Funding Opportunities
•Build the 2nd Phase of Water Reclamation Facility by 2030
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Increase the Total
DAWS to 9,200 AFY
•Increase Renewable Water Supply
by 1,681 AFY In 2030
•Reduce Overall Reliance of GW
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Community Engagement -Coming Soon
•Dedicated Webpage
•Outreach
–Social Media
–Newsroom
–Media Releases
–Billing Inserts
–Posters
–Video
•Citizen Feedback
–Online
–Social Media
–Public Meetings
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Questions
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Water Consumption for Agriculture vs. Municipal
General Agricultural Use Reduce Groundwater Pumping~4 AF for Ag. Use
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Tucson Water –Water Portfolio
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Before Now