Soquel Creek Water District

1
Soquel Creek Water District

• Draft
• 2006 Integrated Resources Plan
• January 31, 2006

2
2006 IRP Contents

• Section 1 Executive Summary
• Section 2 IRP Process
• Section 3 Demand Projections
• Section 4 Water Conservation Savings
• Section 5 Water Supply Conditions
• Section 6 Need for Water
• Section 7 Water Supply Alternatives and
  Resulting Strategy
• Section 8 Implementation of the Preferred
  Alternative

3
Executive Summary

• We Have a Supply Shortfall Today, and Future
  Demand Will Increase the Shortfall
• A Multi-faceted Program Could Address the
  Shortfall
• A Sizable Conjunctive Use Project is Necessary
• Regional Seawater Desalination with the City of
  Santa Cruz is the current best option
• Other Elements Will Continue to be Explored
• The Integrated Resources Plan provides the
  Long-Term Road Map

4
Section 2

• Integrated Resources Planning Process

5
Section 2

• SqCWD Service Area
• Background
• Supply conditions We are Overdrafting the
  Groundwater Basin under Current Demands
• 1999 Draft IRP prepared by the PAC
• Demand
• Groundwater yield
• Conservation savings
• Supply needs
• Alternatives considered
• Project Evolution Subsequent to the PAC Process
• Program-Level EIR
• 2006 IRP

6
Section 3

• Demand Projections

7
Comparison of 1999 Draft IRP and 2006 Revised
Demand

Note Actual water use for the years 1995, 2000
and 2005 reflect average water production/consumpt
ion for the periods 1991-1995, 1996-2000, and
2001-2005 respectively.
8
How Do Revised Projections Differ from 1999
Projections?

• 2006 Revisions
• used 2000 actual use as base year (5,463 af)
• used development of vacant lands for 2010 and
  2020
• used straight line growth rates between 2020 and
  2040 (2050)

• 1999 Draft IRP
• used 1996 projection as base year (5,480 af)
• assumed development of vacant lands by 2001
  (inside USL) and 2006 (outside USL)
• used portions of AMBAG growth rates for 2006-2015
  and then used straight line between 2015 and 2030

9
Growth Will Occur Later (Slower) Than Expected
10
Section 4

• Conservation Savings

11
Demand Adjusted for Conservation Savings
12
Conservation SavingsReduction from Average Demand
13
Demand Adjusted for Interior Residential
Conservation Savings
14
Section 5

• Water Supply Conditions

15
We Are Overpumping OurWater Supply Today
16
Production by AquiferAcre Feet per Year (average
2001-2005)
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Analysis of Reduced Pumping and Aquifer Recovery

• Pumping Needs to be Reduced in Both Aquifers by
  at Least 600 afy (combined reduction)
• Establish Preliminary Groundwater Level
  Objectives
• Monitor
• Adjust as necessary
• Groundwater Resource Restoration
• Arrest Landward Movement of the
  Saltwater/Freshwater Interface

18
Section 6

• Need for Water

19
Need for Additional Supplies

• To Meet Customers Consumptive Needs
• To Arrest the Landward Movement of Seawater and
  Aggressively Push the Saltwater/Freshwater
  Interface Further Offshore by Raising Coastal
  Groundwater Levels

20
Need for Additional Supplies

• Projected Net Water Demand
• 5,210 afy in 2010
• 6,080 afy in 2050
• Supply Conditions
• available supplies not to exceed 4,800 afy
• Supply Shortfall
• under current conditions
• under Build-Out conditions
• Additional Pumping Reduction
• to increase groundwater levels

21
2050 Supplemental Water Supply Needs (AFY)
7,030 - 950 - 4,800 ___ 1,280 Avg Demand -
Conservation - GW Yield Restoration Need for
Water
22
Section 7

• Water Supply Alternatives and Resulting Strategy

23
PAC-Considered Alternatives

• Surface Water from the City of Santa Cruz
• Regional Seawater Desalination
• Soquel Creek Diversion
• Recycled Water
• Reservoir at Olympia Quarry
• Additional Conservation
• Recharge Enhancement with Precipitation
• Water Import/Banking
• On-Stream Reservoir (Glenwood)

24
PAC-Recommended Alternatives

• Soquel Creek Diversion
• Regional Seawater Desalination
• Recycled Water

25
Three Revised Alternatives

• Soquel Creek Diversion
• Local-only option
• Water Import/ Groundwater Banking
• Regional option with PVWMA, Watsonville and a
  Willing Seller
• Regional Seawater Desalination
• Regional option with City of Santa Cruz

26
Soquel Creek Diversion

• How It Works
• Divert water from Soquel Creek in winter months
  when flows are above minimum in-stream fish flow
  requirements
• Treat and deliver water to SCWD customers
• Inject treated water into the groundwater basin
  for storage and later use

27
Water Import/Groundwater Banking

• How It Works
• SqCWD would augment imported water with up to
  2,000 afy
• SqCWD would enhance the PVWMA BMP to incorporate
  use/storage of the additional supply (including
  expansion of the Coastal Distribution System to
  serve 500 more acres of agriculture.)
• SqCWD would extract groundwater from a City of
  Watsonville inland well, and pipe the water for
  use in SqCWD

28
Regional Seawater DesalinationWith City Of Santa
Cruz

• How It Works
• Construct Desalination plant in Santa Cruz
• SqCWD uses plant to augment supplies during
  normal years
• Santa Cruz would use the plant during drought
  periods
• SqCWD would rely only on groundwater during those
  periods when full desal capacity is required by
  the City

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Results of Comparative Evaluation

• Soquel Creek Diversion has too many uncertainties
• At this time
• At proposed size
• Water Import/Groundwater Banking is Stalled
• City of Santa Cruz has Certified a Program-Level
  EIR and Approved the Regional Desalination
  Alternative as Preferred

30
2006 IRP Preferred Alternative

• Conjunctive Use Supply Project
• Development of Regional Seawater Desalination
  with the City of Santa Cruz
• Demand Management
• Existing and New Conservation
• Drought Curtailment up to 15
• Site-Specific Recycled Water for Irrigation
• Local Supplemental Supply Alternatives
• Soquel Creek Diversion (modified)
• Local-only Desalination (pending feasibility)
• Groundwater Management
• Monitoring of Groundwater Quality and Levels
• Redistribution of Groundwater Pumping
• Recharge Protection and Enhancement

31
Section 8

• Implementation of the Preferred Alternative

32
2005
2010
2015
2020
2025
Regional Desalination
Soquel Creek Water District Integrated Resources
Plan Preferred Alternative
On line On Time ??
Existing Conservation and Drought Management
Programs
Conjunctive Use Supply
Continue Program
Increase Conservation and Recycled Water Projects
Anna Jean Cummings Park Satellite Recycled Water
Pilot Project
Continue Program
Demand Management

• Conduct Project-Level Studies
• Soquel Creek Winter Diversions
• Local-only Desalination

Implement a Local-Only Project
Implement a Local-Only Project
Redistribution of Groundwater Pumping
Redistribution of Groundwater Pumping
Redistribution of Groundwater Pumping
Redistribution of Groundwater Pumping
Water Quality Management
Groundwater Conditions OK?
Groundwater Conditions OK?
Groundwater Conditions OK?
Monitor/Assess Coastal Groundwater Quality
Recharge Protection and Enhancement
33
Comparison of 1999 Draft IRP and 2006 Revised IRP
34
Comparison of 1999 Draft IRP and 2006 Revised IRP
(Cont)
35
Comparison of 1999 Draft IRP and 2006 Revised IRP
(Cont)
36
Executive Summary

• We Have a Supply Shortfall Today, and Future
  Demand Will Increase the Shortfall
• A Multi-faceted Program Could Address the
  Shortfall
• A Sizable Conjunctive Use Project is Necessary
• Regional Seawater Desalination with the City of
  Santa Cruz is the current best option
• Other Elements Will Continue to be Explored
• The Integrated Resources Plan provides the
  Long-Term Road Map

37
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