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ITEM: |
CONSENT
CALENDAR |
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15. |
RECEIVE AND FILE
DISTRICT-WIDE ANNUAL WATER PRODUCTION SUMMARY REPORT FOR WATER YEAR 2007 |
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Meeting
Date: |
April 21, 2008 |
Budgeted: |
N/A |
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From: |
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Program/ |
Hydrologic Monitoring |
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General
Manager |
Line Item No.: N/A |
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Prepared
By: |
Thomas
Lindberg |
Cost
Estimate: |
N/A |
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General Counsel Approval: N/A |
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Committee Recommendation: N/A |
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CEQA Compliance: N/A |
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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 2007 (WY 2007). WY 2007 covers the 12-month period from
October 1, 2006 through September 30, 2007.
Preliminary computations indicate that 19,200 acre-feet (AF) of ground
water were produced from registered wells in the District during WY 2007. In addition, 106 AF of surface water were
diverted by private users. Combined
surface and ground water production from all sources within the District in WY
2007 is calculated at 19,306 AF. This
report presents comparisons of California American Water (CAW) and non CAW
production in WY 2007 and WY 2006, and compares WY 2007 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 1,139 registered wells in the District. Of this total, 727 wells are active, and 333 wells are inactive. A well is considered active if it has produced any water in the last reporting period, i.e., WY 2007. Information on the remaining 79 registered wells is not available because reporting forms were not returned by owners of those wells.
Data Adjustments – For certain wells, staff estimated actual production to more accurately quantify water produced during WY 2007. Data adjustments were required to estimate water production from 98 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 14 cases, production records were incomplete because reported meter readings covered a period shorter than WY 2007. In 25 other cases, production records were incomplete because meters were replaced or repaired after the start of WY 2007. There are also at least 14 meters that still needed replacement or repair at the end of WY 2007. 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 45 cases in which production was reported for a period longer than WY 2007. 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 three cases, production from wells with non-functioning water meters during WY 2007 was estimated based on historical production reports for these wells.
Reported production from both the CAW Main System and the Seaside Municipal Water System in WY 2007 was adjusted to account for 4.57 AF of water that was produced by CAW and delivered to the Seaside Municipal Water System. Water that was produced for backwashing purposes by wells in the CAW Main System was also deducted from CAW’s production.
District-wide Production - Preliminary production values for WY 2007 are summarized by reporting method (Water Meter or Land Use), reporting status (active, inactive, or not reporting), and source area in Exhibit 15-A. For comparison, production values for WY 2006 are presented in Exhibit 15-B. The various source areas are shown in Exhibit 15-C. The volume of water produced from each source area is shown in Exhibit 15-D. The number of active non CAW wells and the volume of water produced by each reporting method in WY 2007 and WY 2006 are compared in Exhibit 15-E.
District-wide, total water production increased by 475 AF (2.5%) in WY 2007 compared to WY 2006. Specifically, ground water withdrawals increased by 409 AF (2.2%), while surface diversions increased by 66 AF (164.7%) in WY 2007. 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.
Of the 10,456 AF of CAW
production from Carmel Valley, 12 AF were produced and delivered to the
District’s Santa Margarita Test Injection Well (SMTIW) No. 1 for injection into the Seaside Basin. No recovered water from the District’s SMTIW
No. 1 was delivered to CAW in WY 2007. For reference, since the District’s
Seaside Injection/Recovery Program began testing in WY 1998 through the end of
WY 2007, a total of 1,875 AF has been injected into the
Water Allocation Program – With respect to the District’s Water Allocation Program limits, CAW production from the MPWRS in WY 2007 was 14,076 acre-feet, or 3,565 acre-feet (20.2%) 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 2007 was 3,097 acre-feet, or 51 acre-feet (1.7%) more than the non CAW production limit of 3,046 acre-feet established by Ordinance No. 87. The increase in non CAW production is believed to be the result of a combination of two factors. First, due to regulatory constraints on the CAW system, more non CAW wells have been drilled and put into use. Second, from a hydrological standpoint, WY 2007 was characterized as a “critically dry” year, and therefore, the reported increased water usage is likely due in part to the lower than normal precipitation. Although non CAW production exceeded the limit, it is important to note that for the purpose of monitoring compliance with the allocation limits, CAW and non CAW production are tracked collectively. Combined production from CAW and non CAW sources within the MPWRS was 17,173 acre-feet in WY 2007, which is 3,514 acre-feet (17.0%) 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 2007 relative to the District’s Water Allocation limits is presented in Exhibit 15-F.
Lastly, it should be noted that 99% of the ground water production within the District was reported by the water meter method in WY 2007. In addition, over 90% of registered well owners in the District reported annual production for their wells in WY 2007.
15-A District-wide Water Production Summary for Water Year 2007
15-B District-wide Water Production Summary for Water Year 2006
15-C MPWMD Water Production Source Areas
15-D Water Production by Source Area for Water Year 2007
15-E District-wide Production by Reporting Method for non CAW Wells in WY 2007 and
WY 2006
15-F Comparison
of Reported Production to Production Limits within the MPWRS in
WY 2007
U:\staff\word\boardpacket\2008\2008boardpackets\20080421\ConsentCal\15\item15.doc