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Science Plan

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13 open 6 addressed 2 resolved

1Introduction, Background, and Purpose

1.1Introduction and Background

The proposed Delta Conveyance Project will construct and operate new conveyance facilities in the North Delta along the Sacramento River. On February 14, 2025, CDFW issued Incidental Take Permit No. 2081-2024-018-00 under CESA for construction and operation of the DCP.

1.2Purpose

10.18

The purpose of the Science Plan is to create a pathway for DWR to fulfill its requirements under COA 10.18, and the procedures to facilitate the review, revision, and finalization of the CDFW-approved plan and all plans and reports required in its conditions.

2Scope of the Science Plan

2.1Scope

10.1910.2010.2110.26

The plan focuses on study elements related to ITP COA 10.18 and the procedures for review, revision, and finalization of all plans and reports required in the covered conditions of approval.

  • C
    CDFW CDFW 2026-02-26 Fix COA cross-reference Resolved

    Scope text cites COA 10.21.9 modeling as within this plan; 10.21.9 is implemented under the real-time operations program, not the Science Plan.

    • GM
      Greenwood, Marin 2026-03-05

      Removed the 10.21.9 reference from Section 2.1; the real-time operations program is now cited as a related effort only.

2.2Relationship to State Water Project Operations

DCP facilities will be operated in coordination with existing SWP South Delta pumping facilities, in compliance with State and federal regulatory requirements.

3Studies

3.1Studies Overview

10.1910.2010.2110.26

DWR will initiate monitoring studies to establish baseline aquatic conditions and conduct a minimum of five years of monitoring before initiating DCP in-water construction activities.

  • C
    CDFW CDFW 2026-03-12 Scope dispute Open

    The overview should state explicitly which studies must be complete before Phase 1 versus Phase 2 authorization; the current framing defers all sequencing to Appendix A.

3.2Study Development

Study sketches describe the overall intent and direction of the Science Program rather than finalized study designs; each will be progressively developed into a full study plan through continued coordination with CDFW.

3.3Study Plan Requirements

Table 1 details the general requirements and key considerations for each study plan; these requirements are treated as individual sections of each plan.

  • C
    CDFW CDFW 2026-03-12 Governance / approval Open

    Table 1 requirements should include a data-sharing timeline for each study plan; CDFW review cannot proceed on rolling data deliveries otherwise.

3.4Data Management Considerations

Each study plan will define methods for data collection, quality assurance, documentation, storage, and sharing, following common data standards that enable interoperability among DWR, CDFW, and partner agencies.

  • C
    CDFW CDFW 2026-04-02 Governance / approval Addressed

    QA procedures for continuous telemetry data should follow the interagency standard, and versioning must be specified for derived datasets.

    • GM
      Greenwood, Marin 2026-04-18

      Section 3.4 now cites the interagency QA standard and commits each study plan to a versioned derived-dataset register.

3.5Study Sketches

One sketch per condition of approval: the core hypotheses, methods, study components, and relevance to DCP effects of the work proposed for each COA.

3.5.1Condition of Approval 10.19.1 (Migration & Survival Study)

10.19.1

Acoustic-telemetry evaluation of juvenile salmonid survival and routing in the near-field intake reach and through-Delta, establishing the preconstruction baseline required before in-water work.

  • C
    CDFW CDFW 2026-02-10 Rephrase research question Addressed

    RQ1 should separate the baseline objective from the with-project objective so the preconstruction baseline can be approved and started independent of the construction-phase design.

    • GM
      Greenwood, Marin 2026-02-24

      Split into a baseline clause and a with-project clause within RQ1; the baseline component can proceed on the 2027 field season while the construction-phase design is finalized.

  • C
    CDFW CDFW 2026-02-10 Add / adjust metric Open

    The far-field metric set must include reverse-flow frequency, magnitude, and duration as a routing covariate. Flow reversal at the junctions is a primary driver of interior-Delta entrainment and cannot be omitted.

  • C
    CDFW CDFW 2026-03-05 Scope dispute Addressed

    The near-field and far-field components appear to double-count survival in the immediate intake reach. Define the spatial boundary between components so reach-level survival is not attributed twice.

    • GM
      Greenwood, Marin 2026-03-21

      Added an explicit near-field/far-field boundary at the downstream extent of the intake array; near-field survival is reported as a conditional term and excluded from the far-field reach estimate.

  • C
    CDFW CDFW 2026-04-02 Governance / approval Open

    CDFW approval of the Final Study Plan is required before any tagging or array deployment begins. Please state the approval gate explicitly in the reporting requirements.

  • C
    CDFW CDFW 2026-04-02 Model peer-review / documentation Open

    The survival-estimation and routing models must be independently peer-reviewed before the 2030 baseline reporting, including documentation of detection-efficiency assumptions and model structure.

  • C
    CDFW CDFW 2026-05-06 Fix COA cross-reference Resolved

    Background references COA 10.20.2 where the Abundance and Distribution Study (10.19.2/10.19.3) is meant — please correct the coordinating-study cross-reference.

    • GM
      Greenwood, Marin 2026-05-12

      Corrected to 10.19.2 (Predation) and 10.19.3 (Abundance and Distribution); 10.20.2 reference removed.

3.5.2Condition of Approval 10.19.2 (Predation Study)

10.19.2

Hydroacoustic surveys, diet and eDNA sampling, and exposure modeling to characterize predation risk and identify hotspots near the North Delta intakes.

3.5.3Condition of Approval 10.19.3 (Abundance & Distribution Study)

10.19.3

Near-field and far-field surveys of covered-species abundance and distribution at the North Delta intakes, including a technology pilot to select the best abundance-measurement methods before baseline monitoring begins.

3.5.4Condition of Approval 10.20.1 (Installation of New Real-time Monitoring Station)

10.20.1

Installation and rating of a new real-time monitoring station downstream of Intake C before initiation of preconstruction baseline monitoring.

3.5.5Condition of Approval 10.20.2 (Sediment & Turbidity Monitoring)

10.20.2

Continuous sediment and turbidity monitoring at the North Delta diversions, coordinated with the real-time monitoring station, to characterize suspended-sediment and turbidity conditions.

3.5.6Condition of Approval 10.21.1 (Hydrodynamics at Georgiana Slough Monitoring)

10.21.1

Hydrodynamic monitoring at Georgiana Slough to characterize flow split and routing, informing the flow-reversal and routing-minimization analyses under COA 10.21.7.

3.5.7Condition of Approval 10.21.2 (Covered Fish Species Life Cycle Models)

10.21.2

Refinement and evaluation of covered-species life-cycle models to incorporate DCP operations, drawing on the fish and water-quality monitoring studies to identify and address data gaps.

3.5.8Condition of Approval 10.26 (Fish Guidance System)

10.26

Field evaluation across winters 26/27 and 27/28 of whether, and how, a fish guidance system should be incorporated into the North Delta intake structures, with a recommendation due one year before 30% design finalization.

  • C
    CDFW CDFW 2026-02-05 Scope dispute Open

    The sketch is premature. It presupposes that a floating fish-guidance structure is the answer. The objective must first establish whether ANY engineered guidance measure is warranted before evaluating FFGS configurations. Do not presuppose the technology.

  • C
    CDFW CDFW 2026-02-05 Scope dispute Open

    The "FFGS Design Evaluation" step cannot be the terminal output of a study whose first question is whether a structure is needed. Restructure the component so design evaluation is contingent on a positive need finding.

  • C
    CDFW CDFW 2026-02-12 Model peer-review / documentation Open

    The STAIRS individual-based model has not been independently reviewed and is being used as the basis for design decisions. Provide full model documentation before it is relied upon.

  • C
    CDFW CDFW 2026-02-12 Model peer-review / documentation Open

    Provide the STAIRS calibration dataset and the calibration procedure. Without the calibration data we cannot assess whether the model is fit for predicting fish response at the intakes.

  • C
    CDFW CDFW 2026-02-26 Model peer-review / documentation Addressed

    A formal validation step — out-of-sample comparison against observed fish tracks — must be added before STAIRS output informs any design recommendation.

    • GM
      Greenwood, Marin 2026-03-12

      Added an out-of-sample validation step to the STAIRS calibration method; validation must pass before the behavioral-response evaluation proceeds.

  • C
    CDFW CDFW 2026-02-26 Add / adjust metric Open

    Add a predator-exposure metric for each candidate configuration. Guidance structures can concentrate predators; a guidance-efficiency gain that increases predation is not a net benefit.

  • C
    CDFW CDFW 2026-03-09 Governance / approval Open

    The fish-guidance working group must reach documented concurrence before the study advances from need-evaluation to design-evaluation. State this gate in the reporting requirements.

  • C
    CDFW CDFW 2026-03-09 Governance / approval Addressed

    The recommended approach delivered to CDFW one year prior to 30% design requires written CDFW approval, not merely transmittal. Clarify the approval requirement.

    • GM
      Greenwood, Marin 2026-03-24

      Reporting requirements now state the recommended approach requires written CDFW approval prior to finalizing 30% design.

  • C
    CDFW CDFW 2026-03-23 Add / adjust metric Open

    Baseline velocity mapping must report approach AND sweeping velocity across the full operating range, including the high-diversion condition where guidance matters most.

  • C
    CDFW CDFW 2026-04-06 Fix COA cross-reference Open

    Background cites the intake hydraulic models as 10.25 generically; cite the specific contributing COAs (10.25.1–10.25.4) so the dependency is traceable.

  • C
    CDFW CDFW 2026-04-20 Fix COA cross-reference Addressed

    The cross-reference to the velocity-criteria COA is wrong — this study informs design, not the 10.27 velocity-testing compliance series. Correct the linkage.

    • GM
      Greenwood, Marin 2026-05-01

      Removed the erroneous 10.27 linkage; background now references only the design-feeding COAs (10.25.1–10.25.4) and 10.18.2.

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