|
ITEM: |
CONSENT
CALENDAR |
||||
|
|
|||||
|
6. |
RECEIVE AND FILE
DISTRICT-WIDE ANNUAL WATER PRODUCTION SUMMARY REPORT FOR WATER YEAR 2012 |
||||
|
|
|||||
|
Meeting
Date: |
April 15, 2013 |
Budgeted: |
N/A |
||
|
|
|||||
|
From: |
David
Stoldt, |
Program/ |
Hydrologic Monitoring |
||
|
|
General
Manager |
Line Item No.: |
N/A |
||
|
|
|||||
|
Prepared
By: |
Thomas
Lindberg |
Cost Estimate: |
N/A |
||
|
|
|||||
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) 2012. WY 2012 covers the 12-month period from
October 1, 2011 through September 30, 2012.
Preliminary computations indicate that 15,732 acre-feet (AF) of
groundwater were produced from registered wells in the District during WY 2012
(Exhibit 6-A). In addition, 25 AF of surface water were
diverted by private users. Combined
surface and groundwater production from all sources within the District in WY 2012
is calculated at 15,757 AF. This report
presents comparisons of California American Water (Cal-Am) and non Cal-Am
production in WY 2012 and WY 2011, and compares WY 2012 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 1,199 registered wells in the District. Of this total, 800 wells are active, and 374 wells are inactive. A well is considered active if it has produced any water in the last reporting period, i.e., WY 2012. Information on the remaining 25 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 2012. Data adjustments were required to estimate water production from 113 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 Cal-Am monthly distribution factors developed by staff. In 45 cases, production records were incomplete because reported meter readings covered a period shorter than WY 2012. In three other cases, production records were incomplete because meters were replaced or repaired after the start of WY 2012. 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 65 cases in which production was reported for a period longer than WY 2012. 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. There were also 31 cases where adjustments were made due to “order of magnitude issues” resulting from well owners incorrectly reading their water meters. In 15 cases, production from wells with non-functioning water meters during WY 2012 was estimated based on historical production reports for these wells.
District-wide Production - Preliminary production values for WY 2012 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 6-A. For comparison, production values for WY 2011 are presented in Exhibit 6-B. The various source areas are shown in Exhibit 6-C. The volume of water produced from each source area is shown in Exhibit 6-D. The number of active non Cal-Am wells and the volume of water produced by each reporting method in WY 2012 and WY 2011 are compared in Exhibit 6-E.
District-wide, total water production decreased by 430 AF (3%) in WY 2012 compared to WY 2011. Specifically, groundwater withdrawals decreased by 452 AF (3%), and surface diversions increased by 21 AF (650%) in WY 2012. No surface water has been diverted within the Cal-Am 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 Cal-Am or its predecessor did not divert surface water from San Clemente Reservoir.
Of the 7,646 AF of Cal-Am production from Carmel Valley, 131.7 AF were subtracted as this water was delivered for injection to the Aquifer Storage and Recovery (ASR) Projects, consisting of three Aquifer Storage and Recovery Wells in the Seaside Basin. 438 AF of water from the MPWMD ASR No. 1 Well was produced for delivery to Cal-Am in WY 2012 and was included in the Cal-Am production total. For reference, since the District’s Seaside Injection/Recovery Program began testing in WY 1998 through the end of WY 2012, a total of 4,477 AF have been injected into the Seaside Basin.
Water Allocation Program – With respect
to the District’s Water Allocation Program limits, Cal-Am production from the
MPWRS in WY 2012 was 11,809 AF, or 5,832 AF (33.1%)
less than the Cal-Am production limit of 17,641 AF that was established with
the adoption of Ordinance No.
The
comparisons above do not include production from wells that derive their source
of supply from the Laguna Seca Subarea (LSS) of the
Lastly, it should be noted that 99% of the groundwater production within the District was reported by the water meter method in WY 2012. In addition, over 95% of registered well owners in the District reported annual production for their wells in WY 2012.
6-A District-wide Water Production Summary for Water Year 2012
6-B District-wide Water Production Summary for Water Year 2011
6-C MPWMD Water Production Source Areas
6-D Water Production by Source Area for Water Year 2012
6-E District-wide Production by Reporting Method for non Cal-Am
Wells in WY 2012 and WY 2011
6-F Comparison of
Reported Production to Production Limits within the MPWRS in
WY 2012
U:\staff\Boardpacket\2013\20130415\ConsentCal\06\item6.docx