ITEM:

CONSENT CALENDAR

 

12.

RECEIVE AND FILE DISTRICT-WIDE ANNUAL WATER PRODUCTION SUMMARY REPORT FOR WATER YEAR 2008

 

Meeting Date:

April 20, 2009

Budgeted:

N/A

 

From:

Darby Fuerst,

Program/

Hydrologic Monitoring

 

General Manager

Line Item No.:†††† N/A

 

Prepared By:

Thomas Lindberg

Cost Estimate:

N/A

 

General Counsel Approval:N/A

Committee Recommendation: N/A

CEQA Compliance:N/A

 

SUMMARY: Staff has prepared a draft Water Production Summary Report of all registered production sources, i.e., wells and surface water diversions, within the Monterey Peninsula Water Management District (District) for Water Year (WY) 2008.WY 2008 covers the 12-month period from October 1, 2007 through September 30, 2008.Preliminary computations indicate that 19,539 acre-feet (AF) of groundwater were produced from registered wells in the District during WY 2008.In addition, 32 AF of surface water were diverted by private users.Combined surface and groundwater production from all sources within the District in WY 2008 is calculated at 19,571 AF.This report presents comparisons of California American Water (CAW) and non CAW production in WY 2008 and WY 2007, and compares WY 2008 production with the Districtís current water allocation program limits.

RECOMMENDATION:This report is for informational purposes only.The Board should review the draft summary report and provide staff with any comments or questions.Staff will complete and file the final report, incorporating any late revisions, if this item is approved with the Consent Calendar.

 

BACKGROUND:District Rules and Regulations require well owners and operators to submit annual water production information to the District.Well production is calculated by either the Land Use or Water Meter reporting method and is described below.

 

Number of Wells Ė Presently, there are 1,163 registered wells in the District.Of this total, 732 wells are active, and 358 wells are inactive.A well is considered active if it has produced any water in the last reporting period, i.e., WY 2008.Information on the remaining 73 registered wells is not available because reporting forms were not returned by owners of those wells prior to preparation of this report.

 

Data Adjustments Ė For certain wells, staff estimated actual production to more accurately quantify water produced during WY 2008.Data adjustments were required to estimate water production from 105 wells that had either incomplete water meter records or reported water production for a period longer than the water year. Production from metered wells with incomplete records was estimated by using generalized non CAW monthly distribution factors developed by staff.In 16 cases, production records were incomplete because reported meter readings covered a period shorter than WY 2008.In 17 other cases, production records were incomplete because meters were replaced or repaired after the start of WY 2008.There are also at least 16 meters that still needed replacement or repair at the end of WY 2008.The application of monthly distribution factors allowed staff to reasonably account for the percentage of production that was not reported for each of these wells, which was then added to the annual total for these wells.

 

Similarly, there were 65 cases in which production was reported for a period longer than WY 2008.Estimates of the amounts that were over-reported were made based on the monthly distribution factors.These amounts were then subtracted from the reported totals.In eight cases, production from wells with non-functioning water meters during WY 2008 was estimated based on historical production reports for these wells.

 

District-wide Production - Preliminary production values for WY 2008 are summarized by reporting method (i.e., Water Meter or Land Use), reporting status (i.e., active, inactive, or not reporting), and source area in Exhibit 12-A.For comparison, production values for WY 2007 are presented in Exhibit 12-B.Note that the version of the Annual Water Production Summary Report for WY 2007 presented here has been revised since it was originally presented to the Board on April 21, 2008.††† The various source areas are shown in Exhibit 12-C.The volume of water produced from each source area is shown in Exhibit 12-D.The number of active non CAW wells and the volume of water produced by each reporting method in WY 2008 and WY 2007 are compared in Exhibit 12-E.

 

District-wide, total water production increased by 309 AF (1.6%) in WY 2008 compared to WY 2007.Specifically, groundwater withdrawals increased by 382 AF (2.0%), while surface diversions decreased by 73 AF (69.3%) in WY 2008.No surface water has been diverted within the CAW main system since WY 2003 because of seismic safety and sedimentation concerns at San Clemente Dam and Reservoir.WY 2004 marked the first year since 1921, when San Clemente Dam was completed, that CAW or its predecessor did not divert surface water from San Clemente Reservoir.

††

Monterey Peninsula Water Resources System (MPWRS) Ė The MPWRS includes surface water in the Carmel River and its tributaries, and groundwater in the Carmel Valley alluvial aquifer and coastal subareas of the Seaside Groundwater Basin.Overall water production within the MPWRS in WY 2008 decreased by 17.1 AF (0.1%) compared to WY 2007.Specifically, CAW production in WY 2008 increased by 149 AF (1.1%), and non CAW production decreased by 166 AF (5.4%) relative to reported production in WY 2007.CAW production from Carmel Valley increased 380 AF (3.6%), and CAW production from the coastal areas of the Seaside Basin decreased by 231 AF (6.4%).Non CAW production from Carmel Valley decreased by 365 AF (15.2%) compared to WY 2007, and non CAW production from the coastal areas of the Seaside Basin increased by 125.0 AF (15.5%).

 

Of the 10,835 AF of CAW production from Carmel Valley, 60 AF were produced and delivered to the Districtís Aquifer Storage and Recovery (ASR) No. 1 Well for injection into the Seaside Basin.No water from the ASR No. 1 was produced for delivery to CAW in WY 2008. For reference, since the Districtís Seaside Injection/Recovery Program began testing in WY 1998 through the end of WY 2008, a total of 1,936 AF have been injected into the Seaside Basin and 1,139 AF have been produced from the ASR No.1 Well for delivery into the CAW System. ††

 

Water Allocation Program Ė With respect to the Districtís Water Allocation Program limits, CAW production from the MPWRS in WY 2008 was 14,225 acre-feet, or 3,416 acre-feet (19.4%) less than the CAW production limit of 17,641 acre-feet that was established with the adoption of Ordinance No. 87 in 1997.Non CAW production within the MPWRS in WY 2008 was 2,933 acre-feet, or 113 acre-feet (3.7%) less than the non CAW production limit of 3,046 acre-feet established by Ordinance No. 87.Combined production from CAW and non CAW sources within the MPWRS was 17,158 acre-feet in WY 2008, which is 3,529 acre-feet (17.1%) less than the 20,687 acre-feet production limit set for the MPWRS as part of the Districtís Water Allocation Program.Therefore, no action is necessary at this time, although staff will continue to monitor production trends within the MPWRS and District-wide.††A comparison of reported water production from the MPWRS in WY 2008 relative to the Districtís Water Allocation limits is presented in Exhibit 12-F.

 

The comparisons above do not include production from wells that derive their source of supply from the Laguna Seca Subarea (LSS) of the Seaside Groundwater Basin, which was outside the MPWRS as defined during most of WY 2008.The LSS was added to the MPWRS with the adoption of Ordinance No. 135 on September 22, 2008.Because the LSS was added to the MPWRS late in WY 2008, another set of comparisons is presented below that includes production from the LSS, and future Water Production Summary Reports will treat the LSS as part of the MPWRS.When the LSS is included in calculating production from the MPWRS, the comparisons of WY 2008 to WY 2007 are as follows.Total water production within the MPWRS (including LSS) decreased by 150 AF (4.1%) in WY 2008 compared to production in WY 2007. In WY 2008, production by CAW from within the MPWRS (including LSS) increased by 248 AF (1.7%) and the non-CAW production from within the MPWRS (including LSS) increased by 99 AF (0.5%) relative to production reported for WY 2007.†† ††

 

Lastly, it should be noted that 99% of the groundwater production within the District was reported by the water meter method in WY 2008.In addition, over 90% of registered well owners in the District reported annual production for their wells in WY 2008.

 

EXHIBITS

12-A††† District-wide Water Production Summary for Water Year 2008

12-B††† District-wide Water Production Summary for Water Year 2007

12-C††† MPWMD Water Production Source Areas

12-D††† Water Production by Source Area for Water Year 2008

12-E††† District-wide Production by Reporting Method for non CAW Wells in WY 2008 and

††††††††††† WY 2007

12-F†††† Comparison of Reported Production to Production Limits within the MPWRS in

WY 2008

 

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