MONTERY COUNTY 2005 GENERAL PLAN UPDATE STUDY SESSION – WATER RESOURCES May 19, 2005

Introduction – GPU Water Issues

 Regional Water supply  Use and demand  Management and governance  Challenges  Solutions

What is an Acre-Foot?

One water measurement is an acre-foot (AF) One acre-foot = 326,000 gallons Covers one acre, one foot deep Or about one football field to one foot deep In general, two or three households use about one acre-foot of water per year

Monterey County Water Use

Agriculture 540,000 acre-ft Urban 60,000 acre-ft Total Estimate 600,000 acre-ft

Monterey County Water Use

Salinas Valley 550,000 acre-ft North County 31,000 acre-ft Peninsula 15,000 acre-ft

Monterey Water Supply

 Monterey County has ample water supplies  Over 400,000 ac-ft of undeveloped surafce water  Issue is how to manage the supplies we have  Develop better distribution infrastructure

Monterey County: Total Available H

2

O - 1,000,000 ac-ft Undeveloped Surface Water

400,000 ac-ft

Developed Water Sources

600,000 ac-ft

Surface Water Supplies

Average Annual Outflow: 100,000 AF Average Annual Outflow: 250,000 AF Average Annual Outflow: 60,000 AF

Groundwater is the Primary Source of Supply and Storage

Monterey County: Current Developed

Surface Water Recycled Water Desalination

5%

Reservoir Releases

95%

Ground Water

Urban Water Resource Challenges  Salinas Valley Groundwater Basin  9,000 acft Seawater Intrusion  MCWD/FOR A  groundwater quality and augmentation  No Mo Co (PVWMA and WRA)  15,000 acft overdraft  Salinas and Valley Cities  water quality concerns  MPWMD  10,730 acft draw without water rights  Seaside basin in overdraft

Monterey County : Future Developed

Surface Water Recycled Water Desalination

5%

Reservoir Releases

95%

Ground Water

GPU Policy Consideration

 Develop infrastructure to better manage the water supplies we have  Regional water supply solutions  Eliminate overdraft and seawater intrusion  Enhance our groundwater resources  Develop new supplies  Develop IRWMP and CIP

Salinas Valley Water Project

  Critically needed infrastructure Spillway Modification  Surface Diversion  Reservoir Re-op  Cost $18.8 mil

Regional Desal

Transmission Pipeline & Facilities

Water Resource Governance

 Water Resource Management  Monterey County Water Resources Agency  Monterey Peninsula Water Management District  Pajaro Valley Water Management Agency

REGIONAL WATER SUPPLY

 Support programs to secure and protect the County's water resources.

 Reduce overdraft and seawater intrusion and bring the groundwater basins into balance.

 Develop Capital Improvement Plan to address regional needs.

DISTRIBUTION ELEMENTS

 Identify needs - to improve local distribution (minimize mutual water companies).

 Capacity to maintain (TMF).

 Support consolidation.

Water Purveyors

 Water Purveyors  PVWMA  Aromas  Pajaro Sunny Mesa  Cal Water  ALCO Water  California-American Water  Castroville Water District  Marina Coast Water District  PBCSD/CAWD  MCWRA

NoMoCo Water Management Plan

 PVWMA and WRA have need for improved distribution  PVWMA – Basin Management Plan 2002 with recycled water and imported state water  WRA – NoMoCo plan for the Salinas watershed

Springfield Ag Irrigation Project

4

CSIP Extension

5

Water Supply System Consolidation

Prunedale Area Only 6

System Consolidation with New Wells

7

FLOOD MANAGEMENT PROGRAM

Salinas River near Las Palmas Ranch, 1995

Lower Carmel River, 1998

Pajaro River, 1995

TOTAL COSTS OF PRIOR PROJECTS October 2002 Approximate Project Costs Salinas River $ 9,000,000 Carmel River Pajaro River 8,000,000 100,000,000 Other Total Costs 120,000,000 $237,000,000

FLOOD MANAGEMENT PROGRAM

 Establish policies to minimize impacts to flood prone areas (flood plains).

 Establish mitigation measures and design requirements to reduce flood risks.

 Include flood prevention facilities in a Capitol Improvement Plan.

STORM WATER RUNOFF MANAGEMENT

 Develop performance standards (BMPs).

 Design and construction of facilities should reduce peak storm flows and provide water quality benefits.

 Work with County Cities to implement our Regional Storm Water Phase II Program.

DRAINAGE AND EROSION

 Inventory areas of the County that have high probability of erosion, sedimentation and chemical pollution  Require drainage and erosion management plans, best management practices and drainage improvements for development  Require regular maintenance of drainage improvements

RECOMMENDATIONS

WATER RESOURCES

DEVELOPMENT OF WATER RESOURCES

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2.

3.

Coordinate and collaborate with all agencies responsible for the management of existing and new water resources.

Develop a program to eliminate overdraft it its water basins through a variety of strategies to be included in a Capital Improvement Program (CIP) including water banking, groundwater and aquifer recharge and recovery, desalination, pipelines to new supplies and a variety of conjunctive use techniques (consistent with Health and Safety Regulations). As part of an overall conservation strategy and to improve water quality, the County shall encouraging taking development on erosive soils out of production.

DEVELOPMENT OF WATER RESOURCES

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5.

6.

The County Building Division shall establish guidelines that integrate National Greenbook construction materials and fixtures that contribute to increased levels of water conservation.

Water recycling including dual plumbing shall be for outdoor irrigation only. A cross connection control program to provide regulatory oversight is needed. The use of grey water for commercial landscaping purposes shall require a discretionary permit.

FLOOD MANAGEMENT

7.

8.

 County Flood Management Program shall include: Mapping of floodplain and high risk areas   Establish policies to keep intensive uses out of flood prone areas Establish mitigation measures and design requirements to reduce flood risks   Incorporate local and regional flood management plans and facilities Construct flood prevention facilities where fundable  Employ both structural and non-structural solutions to maintain floodplain functions of sedimentation, deposition, water filtering and flood water absorption Develop runoff performance standards that result in an array of site planning and design techniques. These techniques should reduce storm flows, capture and recharge runoff water. Design and construction of facilities should reduce peak storm flows and provide water quality benefits.

DRAINAGE AND EROSION

9.

10.

11.

Inventory areas of the County that have a high probability of erosion, sedimentation and chemical pollution.

Require erosion management plans for development in these areas.

Require drainage improvements as a condition of project approval.