Meeting Date:

May 17, 2010





Darby Fuerst,


Hydrologic Monitoring


General Manager

Line Item No.:     N/A


Prepared By:

Thomas Lindberg

Cost Estimate:



General Counsel Review:  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) 2009.  WY 2009 covers the 12-month period from October 1, 2008 through September 30, 2009.  Preliminary computations indicate that 18,730 acre-feet (AF) of groundwater were produced from registered wells in the District during WY 2009 (Exhibit 12-A).  In addition, 28 AF of surface water were diverted by private users.  Combined surface and groundwater production from all sources within the District in WY 2009 is calculated at 18,758 AF.  This report presents comparisons of California American Water (CAW) and non CAW production in WY 2009 and WY 2008, and compares WY 2009 production with the District’s 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 – Presently, there are 1,196 registered wells in the District.  Of this total, 736 wells are active, and 384 wells are inactive.  A well is considered active if it has produced any water in the last reporting period, i.e., WY 2009.  Information on the remaining 76 registered wells is not available because reporting forms were not returned by owners of those wells prior to preparation of this report.


Data Adjustments – For certain wells, staff estimated actual production to more accurately quantify water produced during WY 2009.  Data adjustments were required to estimate water production from 74 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 nine cases, production records were incomplete because reported meter readings covered a period shorter than WY 2009.  In six other cases, production records were incomplete because meters were replaced or repaired after the start of WY 2009.  There are also at least 10 meters that still needed replacement or repair at the end of WY 2009.  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.  There were also 15 cases where adjustments were made due to “order of magnitude issues” resulting from well owners incorrectly reading their water meters.


Similarly, there were 59 cases in which production was reported for a period longer than WY 2009.  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 2009 was estimated based on historical production reports for these wells. 


District-wide Production - Preliminary production values for WY 2009 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 2008 are presented in Exhibit 12-B.  Note that the version of the Annual Water Production Summary Report for WY 2008 presented here has been revised since it was originally presented to the Board on April 20, 2009.    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 2009 and WY 2008 are compared in Exhibit 12-E.


District-wide, total water production decreased by 800 AF (4.1%) in WY 2009 compared to WY 2008.  Specifically, groundwater withdrawals decreased by 795 AF (4.1%), while surface diversions decreased by 5 AF (14.0%) in WY 2009.  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) 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 2009 decreased by 851 AF (5.0%) compared to WY 2008.  Specifically, CAW production in WY 2009 decreased by 1,126 AF (7.9%), and non CAW production increased by 276 AF (9.4%) relative to reported production in WY 2008.  CAW production from Carmel Valley decreased 368 AF (3.4%), and CAW production from the coastal areas of the Seaside Basin decreased by 759 AF (22.4%).  Non CAW production from Carmel Valley increased by 314 AF (15.4%) compared to WY 2008, and non CAW production from the coastal areas of the Seaside Basin decreased by 43.0 AF (4.6%). 


Of the 10,468 AF of CAW production from Carmel Valley, 182 AF were produced and delivered to the District’s 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 2009. For reference, since the District’s Seaside Injection/Recovery Program began testing in WY 1998 through the end of WY 2009, a total of 2,118 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 – With respect to the District’s Water Allocation Program limits, CAW production from the MPWRS in WY 2009 was 13,099 acre-feet, or 4,542 acre-feet (25.7%) 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 2009 was 3,209 acre-feet, or 162 acre-feet (5.3%) greater 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 16,308 acre-feet in WY 2009, which is 4,379 acre-feet (21.2%) less than the 20,687 acre-feet production limit set for the MPWRS as part of the District’s 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 2009 relative to the District’s 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 but 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.  When the LSS is included in calculating production from the MPWRS, the comparisons of WY 2009 to WY 2008 are as follows.  Total water production within the MPWRS (including LSS) increased by 99 AF (0.5%) in WY 2009 compared to production in WY 2008. In WY 2009, 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) decreased by 150 AF (4.1%) relative to production reported for WY 2008.     


Lastly, it should be noted that 99% of the groundwater production within the District was reported by the water meter method in WY 2009.  In addition, over 90% of registered well owners in the District reported annual production for their wells in WY 2009.



12-A    District-wide Water Production Summary for Water Year 2009

12-B    District-wide Water Production Summary for Water Year 2008

12-C    MPWMD Water Production Source Areas

12-D    Water Production by Source Area for Water Year 2009

12-E    District-wide Production by Reporting Method for non CAW Wells in WY 2009 and 

            WY 2008

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

WY 2009