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CC 2014-10-14_11.a. Lake Lopez Low Reservoir Response Plan A ARROYO INCORPORATED 7 V m * JULY 10, 1911 cQ�IF0VO4\ MEMORANDUM TO: CITY COUNCIL FROM: GEOFF ENGLISH, PUBLIC WORKS DIRECTOR SUBJECT: CONSIDERATION OF THE LAKE LOPEZ LOW RESERVOIR RESPONSE PLAN DATE: OCTOBER 14, 2014 RECOMMENDATION: It is recommended that the City Council adopt a Resolution endorsing the Lake Lopez Low Reservoir Response Plan for the San Luis Obispo County Flood Control and Water Conservation District (District) IMPACT ON FINANCIAL AND PERSONNEL RESOURCES: There are no immediate fiscal impacts from the recommended-action; however reductions in available water supplies will result in corresponding water use limitations imposed on our customers. Reductions in water consumption could significantly reduce revenue generated from rate payers. in addition, there will be an undetermined amount of City staff time invested in the coordination, imposition and enforcement of the water use restrictions and management of the Lake Lopez Low Reservoir Response Plan. BACKGROUND: In 1966, the City of Arroyo Grande entered into an agreement with the District for water supply from the Lopez Reservoir(Lopez Contract).The City's Lake Lopez Entitlement, as a contracting member, is 2,290 Acre Feet per Year(AFY) representing approximately 60%of the City's total water supply. The Lopez Contract was modified in 2000 in association with seismic remediation improvement to the Lopez Dam structure. In 2006, the District prepared an Interim Downstream Release Schedule(IDRS)to provide a plan for managing downstream releases from Lopez Dam prior to the approval of a Habitat Conservation Plan (HCP) for the Lopez project. Included in the.IDRS was a Low Reservoir Response Plan (LRRP) consisting of a methodology to assess near term reservoir levels and a set of actions that could be taken to mitigate the impacts of low reservoir levels. Due to the number of variables that could precipitate a low reservoir level, the original LRRP does not establish specific release rates that would be adopted in the event of a low reservoir condition. It instead provides a methodology that could be used to develop an appropriate release rate. At the time of development of the original LRRP, the period with the most significant consecutive years of low reservoir inflow to Lopez Lake since its construction in the late 1960's, was in the 1987-1992 period. The LRRP projected the worst single year during Item 11.a. - Page 1 CITY COUNCIL CONSIDERATION OF THE LOPEZ LOW RESERVOIR RESPONSE PLAN OCTOBER 14, 2014 PAGE 2 that six year drought(1990)forward and concluded that the appropriate reservoir level that would trigger the LRRP is 20,000 Acre feet of water in storage as measured on April 1. The reservoir as of October 2, 2014, has approximately 22,400 acre feet in storage or 45% of capacity. In response to recent drought conditions, the Zone 3 member agencies along with District staff see an urgent need to update the LRRP to better address current water supply demands. Technical representatives from each of the Zone 3 agencies making up the Technical Advisory Committee (TAC) have met together with representatives of the agricultural community to update the LRRP. The goal of the LRRP is to reduce release and diversions from Lopez Reservoir, when the lake falls below 20,000 acre feet of storage, to preserve water within the reservoir for three to four years under continuing drought conditions. ANALYSIS OF ISSUES: In consideration of current drought conditions, the TAC has reviewed the LRRP and has considered the results of different water supply projections. The Draft LRRP uses data on rainfall and reservoir inflow selected from four different time periods to develop drought scenarios. These scenarios were then input into a model for use in determining the effect of reduced downstream releases and municipal deliveries on reservoir storage. For instance, the 1987-1992 drought remains the most severe multi-year dry period since the construction of the Lopez Project.- The most severe single dry year occurred in 1977 when the combination of stream inflow, rainfall into, and evaporation from the reservoir was a minus 142 acre feet. In comparison, this past year recorded a net inflow/rainfall/evap of +1,499 acre feet, the 5th lowest year since inception of the project. If rainfall this fall is below average, it is predicted that the reservoirwill drop to the 20,000 acre foot level,which is the initial trigger point in the LRRP. The 20,000 acre foot trigger level may come as soon as this December. Downstream releases from Lopez are managed to help protect the groundwater basin from seawater intrusion and to supply water for the municipal and agricultural wells. The current downstream release protocol is to maintain surface flows to the area of the 22nd Street Bridge in Oceano, which is far enough downstream to support wells and the groundwater basin, but not so far so as to send stored water to the ocean. These releases will also maintain the flows necessary to sustain protected species, at the reduced rates typically experienced during drought periods. The LRRP sets forth municipal delivery and downstream release reductions in an effort to extend and conserve the Lopez Reservior supply to the greatest extent possible. The municipal delivery reductions proposed will be trigged at milestones in the reservoir level as listed in the exhibit below: Item 11.a. -_Page 2 CITY COUNCIL CONSIDERATION OF THE LOPEZ LOW RESERVOIR RESPONSE PLAN OCTOBER 14, 2014 PAGE 3 .'MUNICIPAL DIVERSION REDUCTIONS p II III I�u _ 101/0 4,077 0% 3,624 35% 2,941 too 1 There is no proposed reduction to the municipal diversions in the first year, which would allow City staff to implement water conservation and/or water use restriction measures anticipated at the subsequent triggers. Staff is currently preparing a revised Water Shortage Contingency Plan Ordinance following direction received from the City Council on August 26, 2014. This Water Shortage Contingency Plan Ordinance will provide mechanisms for City staff to implement water use reduction mandates to the City customers that will accommodate the delivery reduction from the Lopez Reservoir, if it causes total supply to fall below projected demand. The draft LRRP also provides for a temporary change to the declaration of"Surplus Water" as determined by the Lopez Contract. Declaration of new Surplus Water will be discontinued during enactment of the LRRP, however the individual agencies will be able to "bank" their unused Lopez water. Any unused Lopez water supply not used by any of the Zone 3 agency members will be stored in the reservoir for future use by that agency. This temporary water banking mechanism would only apply during the enactment of the LRRP, potentially rewarding water savings from conservation efforts by Arroyo Grande residents. The proposed reductions in downstream releases, which provide water for environmental habitat and agriculture irrigation, were developed through collaboration with the local agricultural community and are listed in the exhibit below: Item 11.a. - Page 3 CITY COUNCIL CONSIDERATION OF THE LOPEZ LOW RESERVOIR RESPONSE PLAN OCTOBER 14, 2014 PAGE 4 DOWNSTREAM RELEASE REDUCTIONS 9.5% 75.6% 102 � N 92.9% 300 P r 100.0'% 0 ENACTMENT AND ADAPTIVE MANAGEMENT To provide District staff, the Zone 3 agencies and agricultural stakeholders with sufficient flexibility to adapt to changing drought conditions and to address the environmental requirements, the draft LRRP includes an adaptive management component that allows the initial prescribed actions to be modified and adapted to the specific drought conditions. The steps for modifying the initial prescribed actions are outlined below: 1. The TAC will review several factors including the time of year that the LRRP is enacted, when the reservoir level drops to lower triggers, and hydrologic conditions including but not limited to: predicted climatic conditions; anticipated reservoir inflow; and the availability of the Zone 3 agencies' other water supplies. 2. If determined to be necessary, the TAC will make a recommendation to the Zone 3 Advisory Committee on a strategy for modifying the initial prescribed actions, hereafter referred to as an Adaptive Management Strategy. . Upon review of the TAC's recommendation, the Zone 3 Advisory Committee will vote to approve, deny, modify or continue consideration of the Adaptive Management Strategy for a period not to exceed 30 days, at which time the Advisory Committee will act to approve, deny or modify. If approved by the Advisory Committee, the Adaptive Management Strategy will be implemented 14 days following its approval. If the Adaptive Management Strategy is approved, denied, or modified by the Advisory Committee, Advisory Committee members, Zone 3 member agencies, and other third parties in interest may appeal to the County Board of Supervisors within 14 days. If no appeal is made to the Board of Supervisors, the Advisory Committee action will be final. 4. If appealed to the Board of Supervisors, Board action shall be final. Item 11.a. - Page 4 CITY COUNCIL CONSIDERATION OF THE LOPEZ LOW RESERVOIR RESPONSE PLAN OCTOBER 14, 2014 PAGE 5 The Zone 3 Advisory Committee is scheduled to review the final draft LRRP and a CEQA Notice of Exemption in early November. The San Luis Obispo County Board of Supervisors is tentatively scheduled to consider approval of the LRRP on December 2, 2014. ALTERNATIVES: The following alternatives are provided for the Council's consideration: • Adopt the recommended Resolution • Direct staff to prepare an alternative Municipal Diversion schedule. • Do not endorse the LRRP • Provide other direction to staff. ADVANTAGES: The recommended Lopez Low Reservoir Response Plan provides the following advantages: 1. Allows a reasonable time frame to achieve the conservation levels proposed before actual reduction of delivery occurs. 2. Extends the available supply over a longer period, providing more opportunity for sufficient rainfall to occur, hopefully to avoid an empty reservoir. 3. Gives the public advance notice of the reductions in water availability which may have to be imposed. DISADVANTAGES: When the LRRP is triggered, the City of Arroyo Grande is committed to imposing reductions in water available to customers'according to the stages of reservoir level presented in the LRRP and commits the City-to imposing potential hardships to Arroyo Grande customers. ENVIRONMENTAL REVIEW: Staff finds that the endorsement of the LLRP is statutorily exempt from the California Environmental Quality Act (CEQA) pursuant to Section 21169 and CEQA Guidelines, section 15261 in that the storage and annual release of water for various uses is part of the ongoing operation of the reservoir; and CEQA Section 21080 (b)(5) and CEQA Guidelines Section 15269(c) in that the project the adoption of the LLRP is a specific action necessary to prevent or mitigate an emergency. PUBLIC NOTIFICATION AND COMMENTS: The Agenda was posted in front of City Hall on Thursday, October 9, 2014. The Agenda and staff report were posted on the City's website on Friday, October 10, 2014. No public comments were received. Item 11.a. - Page 5 CITY COUNCIL CONSIDERATION OF THE LOPEZ LOW RESERVOIR RESPONSE PLAN OCTOBER 14, 2014 PAGE 6 Attachments: 1. Draft Low Reservoir Response Plan Item 11.a. - Page 6 RESOLUTION NO. A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ARROYO GRANDE ENDORSING THE- LOW RESERVOIR RESPONSE PLAN FOR THE SAN LUIS OBISPO COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT ZONE 3 WHEREAS, the San Luis Obispo County Flood Control and Water Conservation District (District) constructed, owns and operates Lopez Dam and Reservoir, the Lopez Water Treatment Facilities, and the Lopez Water Conveyance System; and, WHEREAS, said facilities are owned and operated by the District on behalf of the District's "Zone 3," which is also known as the Lopez Water Supply System; and, WHEREAS, the District has Agreements with the Cities of Arroyo Grande, Grover Beach and Pismo Beach, the Oceano Community Services District, and San Luis Obispo County Service Area No. 12 (collectively known as the Zone 3 Member Agencies) for delivery of potable water from the Lopez Water Supply to Zone 3 Member Agencies; and, WHEREAS, the District also releases water from Lopez Reservoir into Arroyo Grande creek for the benefit of agriculture and other beneficiaries downstream of Lopez Dam, which are hereinafter referred to as "Downstream Releases," and, WHEREAS, the Agreements between the District and Zone 3 Member Agencies include numerous provisions establishing the rights and responsibilities of the District and the Zone 3 Member Agencies; and WHEREAS, Article 4 of said Agreements provide that the District can curtail delivery of water to Zone 3 Member Agencies in situations including but not limited to drought conditions; and WHEREAS, the District and the Zone 3 Member Agencies have prepared a Low Reservoir Response Plan (LRRP) for the purpose of providing greater certainty regarding the quantities of water that will be delivered to Zone 3 Member Agencies during droughts and other emergencies when less than 20,000 acre feet of water is stored in Lopez Lake; and WHEREAS, the LRRP has been developed in consultation with the Zone 3 Advisory Committee and representatives of local agricultural operations; and WHEREAS, the LRRP includes prescribed actions and an adaptive management approach that together will help to ensure that the needs of the Zone 3 Member Agencies and the beneficiaries of Downstream Releases are met during droughts and other emergencies; and Item 11.a. - Page 7 RESOLUTION NO. PAGE 2 WHEREAS, during droughts and other emergencies, the LRRP provides incentives for water conservation by the Zone 3 Member Agencies by extending the period of time that the Zone 3 Member Agencies can use water that has been allocated to them in accordance with the Agreements and/or as provided in the LRRP; and WHEREAS, during droughts and other emergencies, the LRRP considers the needs of agriculture and other downstream beneficiaries by prescribing a reduction in water that is allocated to Zone 3 Member Agencies by eliminating "Surplus Water" allocations to Zone 3 Member Agencies, that pursuant to the Agreements, would otherwise result from Downstream Releases; and WHEREAS, the adaptive management approach in the LRRP provides the best mechanism to manage the Lopez Water Supply during droughts and other emergencies where -conditions can change depending on hydrological and other conditions that persist during droughts and other emergencies; and WHEREAS, the City Council has reviewed the project in compliance with the California Environmental Quality Act (CEQA), the State CEQA Guidelines, and the Arroyo Grande Rules and Procedures for Implementation of CEQA and has found and determined that the project is exempt per pursuant to Section 21169 and CEQA Guidelines, section 15261 in that the storage and annual release of water for various uses is part of the ongoing operation of the reservoir; and CEQA Section 21080 (b)(5) and CEQA Guidelines Section 15269(c) in that the project the endorsement of the LLRP is a specific action necessary to prevent or mitigate an emergency, and WHEREAS, it is in the public interest that the LRRP is endorsed. NOW THEREFORE BE IT RESOLVED, that the City Council of the City of Arroyo Grande does hereby: 1. Endorse and recommend adoption of the Lopez Low Reservoir Response Plan for the San Luis Obispo County Flood Control and Water Conservation District Zone 3 On motion of Council Member , seconded by Council Member and on the following roll call vote, to wit: AYES: NOES: ABSENT: the foregoing Resolution was passed and adopted this day of 12014. I Item 11.a. - Page 8 RESOLUTION NO. PAGE 3 i TONY FERRARA, MAYOR ATTEST: KELLY WETMORE, CITY CLERK APPROVED AS TO CONTENT: STEVEN ADAMS, CITY MANAGER APPROVED AS TO FORM: TIMOTHY J. CARMEL, CITY ATTORNEY Item 1 1.a. - Page 9 ATTACHMENT 1 Low Reservoir Response Plan= Public Review Draft forthe San Luis Obispo County Flood Control and Water Conservation District Zone 3 October 6, 2014 Item 11.a. - Page 10 Table of Contents 1 Introduction, Purpose and Plan Adoption............................................................................................... 1 2 Background.............................................................................................................................................. 1 3 LRRP Elements......................................................................................................................................... 2 3.1 Enacting the LRRP and Initial Prescribed Actions......................................................................... 2 3.2 Adaptive Management................................................................................................................. 3 3.3 Reduction& Recovery Triggers.................................................................................................... 3 3.4 Municipal Diversion Reductions...................................................................................................4 3.5 Downstream Release Reductions.................................................................................................4 3.5.1 HCP Reduction Strategy........................................................................................................ 5 3.6 Extended Delivery Provisions....................................................................................................... 5 3.6.1 Evaporation Losses............................................................................................................... 6 Appendix A. LRRP Enactment&Adaptive Management Flow Chart........................................................A Appendix B. Reduction Strategy Evaluation............................................................................................. B Item 11.a. - Page 11 SLOCFC&WCD Zone 3 Introduction, Purpose and Plan Adoption Low Reservoir Response Plan-Public Review Draft 1 INTRODUCTION, PURPOSE AND PLAN ADOPTION The Low Reservoir Response Plan (LRRP)describes a set of actions that the San Luis Obispo County Flood Control and Water Conservation District (District) Zone 3 will implement when the amount of water in storage within the Lopez'Reservoir drops below 20,000 Acre-Feet (AF) provided that the District's Board of Supervisors has declared an emergency related to Zone 3. The purpose of the LRRP is to limit downstream releases and municipal diversions from Lopez Reservoir during periods of low reservoir storage (i.e. less than 20,000 AF)to preserve water within the reservoir, above the minimum pool level, for a minimum of 3 to 4 years under continuing drought conditions. The criteria for reducing municipal diversions and downstream releases are summarized in Section 3. Droughts have unpredictable impacts on water supplies. The duration of droughts and the actual amount of rainfall and run-off during droughts can differ significantly. As a result, the LRRP has been developed to provide an initial set of prescribed actions combined with an adaptive management approach. The purpose of the LRRP is to act as the guiding document during drought emergencies, as outlined in the Interim Downstream Release Schedule (IDRS). The initial prescribed actions establish baseline actions, and several adaptive management scenarios are included so that actual hydrological conditions can be evaluated during a drought. In summary, ongoing evaluation of actual hydrological conditions is needed during a drought, and through the adaptive management approach, prescribed actions can be modified, if needed,so that the 3-4 year target can be achieved. The District's Board of Supervisors (BOS) is responsible for final adoption of the LRRP. Prior to adoption by the Board of Supervisors,the following steps are necessary: 1. Development of the draft LRRP guided by the Zone 3 Technical Advisory Committee (TAC). 2. Review of the draft LRRP with Zone 3 agricultural stakeholders. 3. Consideration of policy direction that may be provided by any of the governing boards of the Zone 3 agencies as the draft LRRP is being developed. 4. Review and approval by the Zone 3 Advisory Committee (AC). 5. Formal approval by the governing boards of the Zone 3 member agencies, by resolution, with appropriate findings to address the following: a. The California Environmental Quality Act(CEQA). b. Emergency provisions that are unique and necessary to the LRRP, but which may differ from contract provisions that control Zone 3 operations and deliveries during normal operating,conditions. 6. Final approval by the BOS. 7. Enacting the LRRP as described in this document and outlined in Appendix A. 2 BACKGROUND Since completion of its construction in 1969, the Lopez reservoir has experienced extended periods of low reservoir inflow that have led to decreased storage levels within the lake. Analysis of historical storage data from Lopez Reservoir identified that the lowest storage water level (16,455 AF) within the 1 Item 11.a. - Page 12 SLOCFC&WCD Zone 3 LRRP Elements Low Reservoir Response Plan-Public Review Draft reservoir occurred in November of 1992. Figure 1 shows monthly storage levels within Lopez Reservoir since April 1969. Since 1992, there have been significant changes in dam operations, (e. . Interim Downstream Release Schedule (IDRS) implementation) that affect the amount of water that is released and diverted from the reservoir on an annual basis. Modified operations and historic drought conditions have highlighted the need for evaluation of LRRP reduction scenarios. 60,000 50,000 40,000 r x 4) 30,000 41 20,000 0 E 10,000 a t a l Coco 14 '4 e4 w—N­4 wr l'i�4 'q r-m r 4 x q m 4 w.--a w-a 14.4'4'4 ®—a'4 a—a-1 N N N N N N C14 N N N P4 N N'N N r r a w p a a r r a r a a a r- w wa pr r- a r a r r u u u r a a o r u C a.. a— a.. C C av w.. av w.. ae ev ae C as s_. r.. a.. a.. u., C a".. n°_ �. C p:.. aa» am. a�. a� a°. uw. 4'3.., CA,Ck,M.�..�.�..�.�. �$»�..�k.G�.� CL�..�A..C:t.C..C9.C. .. �,t.t�..C. ..CS.�.£.�.C..�"&.CS.,�S.C'.�&�.. ..¢�. ,�Y.M, Figure 1. Lopez.Reservoir Storage 3 LRRP ELEMENTS 3.1 ENACTINGTHE LRRP AND INITIAL PRESCRIBED ACTIONS The LRRP is automatically enacted if the total volume of water in the Lopez Reservoir falls below 20,000 AF and the BOS has declared an emergency related to Zone 3. The initial prescribed actions,once the LRRP is enacted, are as follows: • Reductions in entitlement water deliveries as set forth in Table ; and • Reductions in downstream releases as set forth in Table 2,with actual releases timed to best meet the needs of agricultural stakeholders and to address environmental requirements; an • No new allocations of Surplus Water from unreleased downstream releases; and Item 11.a. - Page 13 SLOCFC&WCD Zone 3 LRRP Elements Low Reservoir Response Plan-Public Review Draft • Extension of time that agencies can take delivery of existing unused water; throughout the duration that the Drought Emergency is in effect, subject to evaporation losses if the water is not used in the year originally allocated. 3.2 ADAPTIVE EN To provide the District,the Zone 3 agencies and agricultural stakeholders with sufficient flexibility to adapt to changing drought conditions and to address the environmental requirements,the LRRP includes an adaptive management component that allows the initial prescribed actions to be modified and adapted to the specific drought conditions. The steps for modifying the initial prescribed actions are outlined below and are show in Appendix A. . The TAC will review several factors including the time of year that the LRRP is enacted,when the reservoir level drops to lower triggers,and Hydrologic Conditions including but not limited t : predicted climatic conditions; anticipated reservoir inflow; and the availability of the Zone 3 agencies'other water supplies. 2. If determined to be necessary,the TAC will make a recommendation to the AC on a strategy for modifying the initial prescribed actions, hereafter referred to as an Adaptive Management Strategy. 1 Upon review of the AC's recommendation,the AC will vote to approve, deny, modify or continue consideration of the Adaptive Management Strategy,for a period not to exceed 30 days, at which time the AC will act to approve,deny or modify. If approved by the AC,the Adaptive Management Strategy will be implemented ays following its approval. if the Adaptive Management Strategy is approved, denied,or modified by the AC,AC members, Zone 3 member agencies, and other 3 Id parties in interest may appeal to the BOS,within 14 days. I no appeal is made to the BOS,the AC action will be final. . if appealed to the BOS,the BOS action shall be final. REDUCTION E TRIGGERS To provide the District,Zone 3 agencies and the agricultural stakeholders with an initial framework for water supply planning, Reduction & Recovery Triggers,tied to the amount of water within the reservoir, were developed for the LRRP. Under the initial prescribed actions the Reduction & Recovery Triggers were set for the following storage levels: 20,000; 1.5,000; 10,000; 5,000; and 4,000 AF. As the amount of water in the reservoir drops below or rises above these triggers,the TAC will review the hydrologic condition and if necessary, utilize adaptive management to modify municipal diversions and downstream releases to meet the objectives oft the LRRP, Example scenarios provided in Appendix B show how the reservoir would respond to the implementation of the initial prescribed actions and an alternate reduction strategy under various historical hydrological patterns. 3 Item 11.a. - Page 14 SLOCFC& CD Zone 3 LRRP Elements Low Reservoir Response Plan-Public Review Draft u 4 MUNICIPAL DIVERSION ED U TI Upon enactment of the LRRP,the initial prescribed actions dictate that municipal diversions are to be reduced according to the reduction strategy described in Table 1, which includes Reduction Triggers, reduction percentages and resulting municipal diversions. This municipal diversion reduction strategy may be modified through adaptive management,following the protocol outlined in Section 3.2. Table J., Initial Prescribed Municipal Diversion Reduction Strategy A 4,530 15,000 10% 4,077 .m. 10;100 .20 ,.. ..,�g64 .. ... � mm�.� ... . . . 5,000 3S%2 2,941 4x0 100°1© 0 DOWNSTREAM E REDIXTIONS Upon enactment of the LRRP,the initial prescribed actions dictate that downstream releases are to be reduced according to the reduction strategy described in Table 2,which includes Reduction Triggers, reduction percentages and resulting downstream releases. The Initial Prescribed Downstream Release Reduction Strategy was developed through a collaborative process that included input from the District and agriculture and municipal stakeholders. The resulting downstream releases represent the maximum amount of water that can be released. The District will control the timing of the reduced releases to meet the needs of the agricultural stakeholders and to address environmental requirements. This downstream release reduction strategy may be modified through adaptive management,following the protocol outlined in Section 3. . i The actual amount of water diverted may vary as agencies extend the delivery of their Lopez Entitlement,as described in Section 3.6. a The %reduction provides sufficient water to supply 55 gallons per capita per day( PCD)for the estimated population of the Zone 3 agencies(47,696 in 2010 per the 2010 Zone 3 UWMP). 55 GPCD is the target residential indoor water usage standard used in California Department of ater Resource's 2010 UP Method Guidelines. 4 Item 11.a. - Page 15 SLOCFC& CD Zone 3 LRRP Elements Low Reservoir Response Plan-Public Review Draft Table 2. Initial Prescribed Downstream Release Reduction Strategy ............ . _ ... ... . 3x600 . _w...._- 15,000 _ 9.5% 3,800 10,000 m . ....... 75 670. „. �..�.. _ . _1,026 �. . . 5,000 92.9% 300 �. 4+t71 p � �����- 3.5.1 HCP Reduction Strategy An alternate downstream reduction strategy that could be implemented through adaptive management includes the Habitat Conservation Plan (HCP) Reduction Strategy. Under the HCP Reduction Strategy, downstream releases would be reduced according criteria outlined in the proposed HCP Water Release Program for consecutive low inflow years. Under this strategy,downstream releases would be either cfs or equal to the average inflow over the previous 1.4-day period,whichever is less. 3.6, EXTENDED DELIVERY PROVISIONS Once the LRRP is enacted,and in order to promote conservation and a reduction in the demand on Zone water,Zone 3 member agencies will be provided the ability to extend the time that they may have water delivered,while the BOS drought emergency is in effect. The following is how water allocations to Zone 3 member agencies will be determined at the beginning of each water year while the LRRP is in effect. It is important to note that during a water year, increases and decreases in allocations are possible as a result of adaptive management strategies. 1. At the end of each Water Year(WY) (March 3150,the amount of unused Lopez water from the previous WY will be calculated and documented for each member agency for later use. 2. On April I",the quantity of Entitlement Water for the new WY will be documented for each agency in accordance with the LRRP determinations. Unused water from the prior WY is subject to evaporation losses, which are further described in Section 3.6.1. 3 These downstream releases represent the maximum amount of water that can be released.. Actual releases may be less if releases can be reduced while still meeting the needs of the agricultural stakeholders and addressing the environmental requirements. Item 11.a. - Page 16 SLOCFC&WCD Zone 3 LRRP Elements Low Reservoir Response Plan-Pubic Review Draft 3.6.1 Evaporation Losses While unused water from the prior WY is retained within the Lopez Reservoir, it is subject to evaporation losses, Evaporation losses are to be calculated quarterly and applied to the total amount of unused prior WY water retained by each agency at the end of the quarter. Evaporation losses will be calculated by comparing the surface area of the reservoir with the unused water against what the surface area would be if there were no unused water retained in the reservoir. Evaporation estimates from the District's weather station would then be applied to the difference in surface area to calculate the increased evaporation losses due to the storage of the unused waiter. The unused water evaporation losses will be subtracted from each agency's unused waiter at a rate proportional to the ,amount of unused water retained by each individual agency. 6 Item 11.a. - Page 17 SLOCFC&WCD Zone 3 Low Reservoir Response Plan-Public Review Draft APPENDIX A. LRRP' ENACTMENT &ADAPTIVE MANAGEMENT FLOW CHART A Item 11.a. - Page 18 cu C ci CCU w CL J � 4 d CL LA w C ....... CL m CL i aj aj LA cu di 3 v .y v d) c vn c " CL p Lu o � o SLOCFC&WCD Zone 3 Low Reservoir Response Plan-Public Review Draft APPENDIX B. 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