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ITEM: |
CONSENT
CALENDAR |
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2. |
RECEIVE AND FILE
DISTRICT-WIDE ANNUAL WATER PRODUCTION SUMMARY REPORT FOR WATER YEAR 2005 |
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Meeting
Date: |
April 17, 2006 |
Budgeted: |
N/A |
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From: |
David A.
Berger, |
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 District for Water Year 2005 (WY
2005). WY 2005 covers the 12-month
period from October 1, 2004 through September 30, 2005. Preliminary computations indicate that 18,953
acre-feet (AF) of ground water were produced from registered wells in the
District during WY 2005. In addition, 49
AF of surface water were diverted by private users. Combined surface and ground water production
from all sources within the District in WY 2005 is calculated to be 19,002 AF. This report presents comparisons of Cal-Am
and non Cal-Am production in WY 2005 and WY 2004, and compares WY 2005 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 1,066 registered wells in the District. Of this total, 708 wells are active, and 305 wells are inactive. A well is considered active if it has produced any water in the last reporting period, i.e., the WY 2005. Information on the remaining 53 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 2005. Data adjustments were required to estimate water production from 94 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 30 cases, production records were incomplete because reported meter readings covered a period shorter than WY 2005. In three other cases, production records were incomplete because meters were replaced or repaired after the start of WY 2005. 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 58 cases in which production was reported for a period longer than WY 2005. 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 2005 was estimated based on historical production reports for these wells.
District-wide Production - Preliminary production values for WY 2005 are summarized by reporting method (Water Meter or Land Use), reporting status (active, inactive, or not reporting), and source area in Exhibit 2-A. For comparison, production values for WY 2004 are presented in Exhibit 2-B. The various source areas are shown in Exhibit 2-C. The volume of water produced from each source area is shown in Exhibit 2-D. The number of active non Cal-Am wells and the volume of water produced by each reporting method in WY 2005 and WY 2004 are compared in Exhibit 2-E.
District-wide, total water production decreased by 1,081 AF (5.4%) in WY 2005 compared to WY 2004. Specifically, ground water withdrawals decreased by 1,077 AF (5.4%), while surface diversions decreased by 4 AF (7.5%) in WY 2005. Cal-Am did not divert any surface water in WY 2004 or WY 2005 because of seismic safety and sedimentation concerns at San Clemente Dam and Reservoir. It should be noted that WY 2004 was 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.
It is important to note that 351 AF
of Cal-Am production from
Water Allocation Program – With respect to the District’s Water Allocation Program limits, Cal-Am production from the MPWRS in WY 2005 was 14,039 acre-feet, or 3,602 acre-feet (20.5%) less than the Cal-Am production limit of 17,641 acre-feet that was established with the adoption of Ordinance No. 87 in 1997. Non Cal-Am production within the MPWRS in WY 2005 was 2,658 acre-feet, or 800 acre-feet (23.1%) less than the non Cal-Am production limit of 3,046 acre-feet established by Ordinance No. 87. Combined production from Cal-Am and non Cal-Am sources within the MPWRS was 16,697 acre-feet in WY 2005, which is 3,990 acre-feet (19.3%) less than the 20,687 acre-feet production limit set for the MPWRS as part of the District’s Water Allocation Program.
Again, it should be noted that
this analysis is complicated by the fact that, although 351 acre-feet of Cal-Am
production from
Lastly, it should be noted that 99% of the ground water production within the District was reported by the water meter method in WY 2005. In addition, over 95% of registered well owners in the District reported annual production for their wells in WY 2005.
2-A District-wide Water Production Summary for Water Year 2005
2-B District-wide Water Production Summary for Water Year 2004
2-C MPWMD Water Production Source Areas
2-D Water Production by Source Area for Water Year 2005
2-E District-wide Production by Reporting Method for non Cal-Am Wells in WY 2005 and
WY 2004
2-F Comparison of Reported Production to Production Limits within the MPWRS
in
WY 2005
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