Actions

This page describes potential actions to test within scenarios. Some, but not all of these were tested as part of Phase 3 in the bookend, blended, and balanced scenarios.

For additional details on how these actions are incorporated into the model, please see the R2Rscenario package documentation site.

Type	Action	Description
Habitat	Current & Planned	Current habitat from SIT DSM habitat + planned habitat projects.
Habitat	Max habitat	Max potential spawning, instream rearing, and floodplain rearing habitat. More documentation provided here. This action also includes all current and planned habitat projects.
Habitat	Floodplain / Rice field habitat	Manage rice fields (wet side) to increase floodplain habitat and prey density in Sacramento watersheds.
Habitat	Floodplain / Rice field habitat	Manage rice fields (dry side, outside the bypasses) to increase floodplain habitat and prey density in Sacramento watersheds.
Habitat	Floodplain	Increase (restore) floodplain habitat on the San Joaquin.
Habitat	Floodplain habitat (HRL)	Increase (restore) floodplain habitat by 20,000 ac in Sacramento watersheds. This approximates proposed components of the Healthy Rivers and Landscapes Program.
Habitat	Habitat improvements - prey	Improve habitat through food/prey subsidy management practices to increase salmon growth and survival.
Habitat	Habitat improvements - prey (HRL)	Increase prey density to high in certain watersheds and times of year that coarsely represents effects of increasing 20,000 ac off-channel ac. This approximates proposed components of the Healthy Rivers and Landscapes Program.
Habitat	Habitat improvements predation control, large-scale	Improve habitat through various predator management practices (e.g., reducing predator contact points) to increase salmon survival. This action reduces predator contact points to ? of the number under baseline conditions.
Habitat	Habitat improvements - predation control, small-scale (HRL)	Improve habitat through various predator management practices (e.g., reducing predator contact points) to increase salmon survival. This action reduces predator contact points at a smaller-scale by removing a specific number of predator contact points as proposed in components of the Healthy Rivers and Landscapes program.
Habitat	Near-future habitat (HRL)	Habitat projects and acreages come from two sources: either provided directly by a watershed as a flow-to-suitable area curve including proposed habitat projects, or scaling an existing habitat curve using the proportion of proposed additional habitat listed in the Healthy Rivers and Landscapes Program implementing agreements (Memorandum of Understanding Appendix 2). This action also includes all current and planned habitat projects. This approximates proposed components of the Healthy Rivers and Landscapes Program.
Hydrology	Current operations	Current flow operations (CalSim 2019 BiOp).
Hydrology	Functional flows (FF)	TNC-informed FF. Simulate ìfunction flowsî that represent natural flows for a wet year in the Sacramento River, assuming little to no impairment or diversions. Informed by TNCís Natural Flows Database and expert input. Supplemental analysis could explore altering FF hydrographs (e.g., to simulate different % unimpaired flows). Other tributaries are assumed to operate under current flow operations. Accounts for flow survival thresholds on the San Joaquin River. Other tributaries are assumed to operate under current flow operations.
Hydrology	Planned flow operations (HRL)	Modify flows based on CalSim3 modeling in the SWP LTO DEIR Cumulative document. This approximates proposed components of the Healthy Rivers and Landscapes Program.
Hydrology	Run of River	Increased flows based on available CalSim data for ìRun of the Riverî scenario [EXP1], which simulates unimpaired flows under climate change natural hydrograph, where 1) Projects do not store water, although releases will occur for flood control and dam safety purposes, 2) Senior water right holders can divert when water is available, and 3) no SWP/CVP exports occur. More documentation provided here.
Harvest	Current ocean and river harvest rates	Current harvest values based on Preseason Report I Stock Abundance Analysis and Environmental Assessment Part 1 for 2022 Ocean Salmon Fishery Regulations. Available here.
Harvest	No or reduced harvest	Set harvest numbers to 0.
Harvest	No or reduced harvest (dry years)	No or reduced harvest of dry year outmigrants (e.g., 3 years after dry year), reduce harvest of juveniles from dry years.
Harvest	Tribal and private sport fishing only (no commercial)	Current harvest for Tribes and sport (recreational) fishing; no commercial harvest.
Harvest	Commercial harvest of hatchery fish only	Commercial harvest of hatchery fish only; assume complete marking of hatchery fish.
Harvest	Intelligent CRR harvest	Harvest ocean and tributary fish only if population exceeds the number† needed to reach CRR target (defaults to CRR of 1).
Harvest	Intelligent habitat harvest	Harvest ocean and tributary fish only if population exceeds habitat capacity in a given year.
Harvest	Tribal harvest prioritized	Minimize impacts to Tribal harvest by preserving 1% (a working value) of in-river natural fish for tribal harvest.
Harvest	Size-selected harvest	Modify current rules (in-river and oceans) to reduce harvest of bigger fish.
Harvest	No or decreased harvest of certain age classes	Harvest only designated age classes.
Hatchery	Current hatchery production	Current hatchery operations based on production targets defined in the California Hatchery Scientific Review Group. Documentation available here.
Hatchery	Modified hatchery production	Modify hatchery production from current output (e.g., 25% increase or decrease) depending on year. Includes max hatcheries action (2x current output).
Hatchery	Outplanting practices	Establish outplanting practices in Delta, Bay, or ocean to increase survival and reduce stray rates.
Hatchery	Terminal hatcheries	Establish terminal hatcheries to reduce stray rates and effects on natural spawners.
Hatchery	Phased hatcheries	Scale up/down hatchery production over time (in development). Could involve scaling up hatchery production in the near-term, then scaling down and transitioning to outplanting/terminal hatcheries.
Hatchery	Weir	Install temporary weir structures to sort fish and prevent hatchery-origin fish on spawning grounds. (Methods in development)