Main San Gabriel Basin Management BASIN REPLENISHMENT by Anthony C. Zampiello
19
Main San Gabriel Basin Management BASIN REPLENISHMENT by Anthony C. Zampiello San Gabriel Valley Water Forum Presented August 28, 2012 SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT THREE VALLEYS MUNICIPAL WATER DISTRICT SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT
description
Main San Gabriel Basin Management BASIN REPLENISHMENT by Anthony C. Zampiello. San Gabriel Valley Water Forum Presented August 28, 2012. SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT. THREE VALLEYS MUNICIPAL WATER DISTRICT. SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT. - PowerPoint PPT Presentation
Transcript of Main San Gabriel Basin Management BASIN REPLENISHMENT by Anthony C. Zampiello
Main San Gabriel Basin Management
BASIN REPLENISHMENTby Anthony C. Zampiello
San Gabriel Valley Water ForumPresented
August 28, 2012
SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT
THREE VALLEYS MUNICIPAL WATER DISTRICT
SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT
Water rights dispute in San Gabriel Valley led to adjudication in 1972
9-person Watermaster Board created to administer judgment
Actions under continuing Court jurisdiction
Main San Gabriel Basin Watermaster
6 Producer Representatives -- nominated annually from Water Rights Holders
3 Public Agency Representatives -- appointed annually from Municipal Water District Boards
MSGB Watermaster Board
Monitors and Manages Groundwater Extractions
Monitors and Manages Day to Day Water Quality of the Basin
Annually Determines the Operating Safe Yield for the Basin
Orders Replacement Water Purchases
Main San Gabriel Basin Watermaster
June 21, 2012, Judgment Amendments Approved
o Extensive Outreach to All Parties
o No Opposition
o Over Twenty Amendments Were Included
o Increased Adaptability To Supply Conditions
o Included Administrative and Operational Fixes
New Management Tool
Export and Storage of Supplemental Water
Public Policy Education
Replacement Purchase Flexibility
Spread of Import Water Above 250 feet (AMSL)
Water Resource Development Assessment
Supplemental Assessments Replacement Water-Purchase Planning in
Conjunction with Responsible Agencies
Key Judgment Amendments
Underlies San Gabriel Valleyo Approximately 167 square miles of surface
area
Serves 80 Percent of Valley Water Needso Approximately 1.4 million people
Annual Water Production: o Approximately 230,000 - 260,000 acre-feet
Main San Gabriel Basin Physical Setting
Getting Water to the Consumer
Water Consumer
Retail Water Suppliers
MSGB Watermaster Municipal Water Districts
Metropolitan Water DistrictL.A. County Dept of Public Works
Cal. Dept of Health Services
SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT
THREE VALLEYS MUNICIPAL WATER DISTRICT
SAN GABRIEL VALLEY MUNICIPAL WATER DISTRICT
Original Basin Management Structure
o Emphasis Placed On Groundwater Supply Related
Facilities (Wells, Reservoirs, Booster Plants)
o Reliance Upon Groundwater Replenishment Deliveries
Interruptible Supply/Replenishment Rate (~$100/AF
Interruptible Rate Reduction)
30,000 To 50,000 AFY
Why is Groundwater So Important to the Valley?
Main Basin Judgment – 1972 (40 Years Of Basin Management)
o Physical Solution “Conjunctive Use” Of Surface Water, Groundwater, Supplemental Water, And
Groundwater Storage – Not A New Concept
Annual Operating Safe Yield Established Based On Current Hydrologic
Conditions – Extractions Without Replacement Water Fee
Allows/Anticipates Over Production To Meet Demands – Replacement Water
Depends On Reliable Untreated Supplemental Water To Replace Over
Production
o Responsible Agencies Deliver Supplemental Water As Replacement
Water
MWD Member Agencies (SWP/Colorado River)
• Upper District
• Three Valleys District
San Gabriel District (SWP 28,800 AFY)
Main Basin Physical Solution
MWD Untreated Imported Water Deliveries o Replenishment Water Rate
“Good Ol’ Days” Historically Available 1972-2007; Replenishment
Water On Interruptible Basis
MWD Cyclic Storage Account (140,000 AF To 100,000 AF
Capacity)
Allowed MWD To Deliver/Store Significant Volume Of Surplus
Water ; Interruptible, Cyclic Storage ± 50,000 AF
Replenishment Rate (Most Recently $442/AF V. $560/AF For Tier
1, Untreated, Full-Service Water)
Historically Never Subject To Readiness To Serve (RTS) Charge
(Only FIRM Deliveries Not Interruptible Deliveries)
Replenishment Rate Suspended In May 2007
Managing Replacement Deliveries
Each Year Board Considers Several Factors:
o Current and projected groundwater elevation at the Key Well.
o Historical and current hydrologic conditions within the Basin
o Rainfall
o Storage of local runoff in surface reservoirs
o Conservation of local runoff
o Availability of supplemental imported water
o Quantity of water in Cyclic Storage
o Carry-over rights
o Other
Establishing The Operating Safe Yield
Basin Replenish Reliability Opportunities
o Under Physical Solution Continue To Work With MWD For Firm/Reliable
Untreated Water Supply (Annual Contract?) Develop A Supplemental Recycled Water Program Promote Conservation Fully Develop Capacity to Capture Large Storm
Events
o Limited Options Without Physical Solution Limit Production To Basin Natural Safe Yield Construct New Treated Water Connections To MWD
And Develop Increased Allocation
Main San Gabriel Basin Management
Imported Supply Reliability
Sediment Management
Critical Habitat Designations
Flood Management
Meeting Future Demands
Local Supply Challenges
So California Coastal Plain is a dry regiono Some areas rely heavily on imported water
SGV groundwater can sustain us through several years of drought
Improvements needed to enhance water supply reliability
o Maximize groundwater storage opportunitieso Additional infrastructure to maintain
groundwater levels, increase operational flexibility
The Simple Truth
Questions
