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ITEM: |
PUBLIC
HEARING |
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10. |
RECEIVE AND CONFIRM WATER
SUPPLY FORECAST FOR PERIOD OF MAY 1, 2020 THROUGH SEPTEMBER 30, 2021; ADOPT
RESOLUTION 2020-05 TO AMEND RATIONING TABLE (XV-4) |
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Meeting
Date: |
May 18, 2020 |
Budgeted: |
N/A |
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From: |
David J. Stoldt, |
Program/ |
N/A |
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General
Manager |
Line Item
No.: |
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Prepared
By: |
Jonathan
Lear |
Cost Estimate: |
N/A |
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General
Counsel Review: N/A |
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Committee
Recommendation: N/A |
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CEQA Compliance: Notice of
Exemption, CEQA, Article 19, Section 15301 (Class 1) ESA Compliance:
Consistent with the September 2001 and February 2009 Conservation Agreements
between the National Marine Fisheries Service and California American Water to minimize take of listed steelhead in the Carmel River and
Consistent with SWRCB WR Order Nos. 95-10, 98-04, 2002-0002, and 2016-0016. |
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SUMMARY: Regulation X of the Monterey Peninsula Water Management District (District) Rules and Regulations requires that a water supply summary forecast report be compiled annually to analyze the status of water supply and demand within the District. This report quantifies rainfall, runoff, and storage conditions within the District as of May 1, 2020, and forecasts the amount of water that will be available for use during the upcoming water year.
Physical Water Availability: As of May 1, 2020, usable water storage within the Monterey Peninsula Water Resource System (MPWRS) totaled 29,720 acre-feet (AF) or 90% of maximum storage capacity. A map of the MPWRS is included as Exhibit 10-A. A breakdown of total storage by reservoir and aquifer is shown in Exhibit 10-B. As shown, usable reservoir storage totals 1,670 AF and usable aquifer storage totals 28,050 AF. This year the method for calculating storage in the Seaside Basin was changed from a storage estimation based on water levels in the Paso Robles Aquifer to an accounting method based on the Natural Safe Yield of 3,000 AF per year as set by the 2006 Seaside Groundwater Basin Adjudication Decision. In addition, a summary of other water-supply related conditions within the MPWRS – rainfall and runoff recorded at San Clemente Dam and California American Water (Cal-Am) monthly diversions from the Carmel River and Seaside Groundwater Basins relative to limits set by the State Water Resources Control Board (SWRCB) and Court -- are shown in Exhibit 10-C and 10-D.
The amount of carryover storage that is needed to meet the projected water needs within the District for the remainder of Water Year (WY) 2020 and all of WY 2021 is shown in Exhibit 10-E. These projections include the water needs of both Cal-Am customers and non Cal-Am water users within the District who rely on water from the MPWRS. As shown, the projected water demand for the remainder of WY 2020 is 6,626 AF. Similarly, the projected demand for WY 2021 is 9,784 AF. These projections are based on the maximum annual production amount for the Cal-Am main system from the Carmel River Basin directed by the SWRCB in Order WR 2016-0016 (8,310 AF in WY 2020 and WY 2021), the maximum annual production amount for Cal-Am from the Seaside Groundwater Basin specified by the Court as a result of the Seaside Basin adjudication (1,820 AF in WY 2020 and 1,474 AF in WY 2019), and the maximum production amount for non Cal-Am users in the MPWRS specified in the District’s Water Allocation Program (3,046 AF).
As shown in Exhibit 10-E, the total amount of water needed on May 1 to meet the projected water demand for the remainder of WY 2019 and all of WY 2020 is 19,456 AF. Given the current usable storage estimate of 29,720 AF, there is sufficient stored water in the MPWRS to meet the projected water needs for the remainder of WY 2020 and begin WY 2021 with a full year’s supply in reserve. This is consistent with the District drought protection goal approved by the Board in August 1993.
It should also be noted that this approach is conservative in that it is based entirely on storage and does not include any allowance for surface and subsurface inflows that are expected to occur. Therefore, based on the physical availability of water, no mandatory water demand reductions, i.e., rationing actions, are required at this time. It should be noted, however, that this analysis does not incorporate environmental considerations such as effects on riparian and aquatic resources or regulatory restrictions.
Note that all water users within the District are presently under Stage 1 Water Conservation which prohibits water waste and all non-essential uses of water.
Community Water Demand: For WY 2020, as of May 1, 2020, Cal-Am had produced 5,617 AF of water from its sources in the MPWRS. This amount of production is 57 AF under the year-to-date at month-end production target that had been set for Cal-Am based on SWRCB Order WR 2016-0016 and the Seaside Groundwater Basin adjudication decision.
RECOMMENDATION: The Board should receive the water supply forecast for the May 1, 2020 through September 30, 2021 period and adopt Resolution 2020-05 to amend Rationing Table (XV-4).
IMPACTS ON STAFF/RESOURCES: District staff currently tracks and reports on water production and water supply conditions on a monthly basis; no additional impacts are anticipated related to this item.
EXHIBITS
10-A Map of the Monterey Peninsula Water Resources System (MPWRS)
10-B Water Storage Conditions, MPWRS
10-C MPWMD Water Supply Status -- May 1, 2020
10-D California American Water Production vs. CDO and Adjudication to Date: Water Year 2020
10-E Derivation of Water Rationing Triggers for the MPWRS for the Remainder of 2020 Water Year and all of 2021 Water Year
10-F Draft Resolution 2020-05
U:\staff\Boardpacket\2020\20200518\PublicHearings\10\Item-10.docx