EKI TECHNICAL PRESENTATION #1 COSUMNES SUBBASIN GSP DEVELOPMENT 17 - - PowerPoint PPT Presentation

EKI TECHNICAL PRESENTATION #1

COSUMNES SUBBASIN GSP DEVELOPMENT

17 OCTOBER 2018 COSUMNES SUBBASIN WORKING GROUP / TAC MEETING

TAC AGENDA ITEM #2 TSS GRANTS AND DATA SURVEY

TSS GRANT

 TSS Fact Sheet  SGMA Monitoring well Fact Sheet  GSA commitment to pursue

monitoring well project

 Responses to date:  OHWD

DATA REQUEST FORMS

 Basin Stakeholders

 Introductory letter  Stakeholder Survey  Data Request Form

 Basin Public Water Suppliers

 Introductory letter

 GSA Input

 Confidentiality clause  GSA contact info

BASIN STAKEHOLDER DATA REQUESTS

(PART 1: STAKEHOLDER SURVEY)

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

Requests general information from Basin landowners and stakeholders

➢ Contact info and general location ➢ Stakeholder characteristics (Agricultural, domestic, municipal, tribal,

environmental, etc.)

➢ Familiarity with SGMA and groundwater management issues ➢ Opinions on land and water resources management ➢ Presence of wells on property and willingness to share data ➢ Recommendations to GSA



To be distributed via GSA website, Board meetings, workshops



Alternate distribution could include water bill inserts, local community organizations

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

Requests specific quantitative data from Basin landowners / stakeholders

➢ Well construction details ➢ Pumping rates and cropping (as applicable) ➢ Water levels and water quality sampling (as available)



Available at: http://cosumnes.waterforum.org



Allows understanding of the historical and current status of groundwater in the Basin



Actual data from the Basin are required, otherwise it’s just a guess!

BASIN STAKEHOLDER DATA REQUESTS

(PART 2: DATA REQUEST FORMS)

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

Requests specific quantitative data from well

• perators or potable water suppliers within the

Basin

➢ Exact well locations ➢ Well construction details ➢ Well construction logs, geologic logs or geophysical

logs

➢ Pumping rates and cropping (as applicable) ➢ Water levels and water quality sampling (as available) ➢ Aquifer pumping test data and analyses/reports



Requests will be sent from appropriate GSAs

BASIN PUBLIC WATER SUPPLIERS DATA REQUESTS

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 Customized data requests will be sent to each GSA after the initial data

compilation

 Since each GSA is an unique entity the data request will be focused on

their specific areas, water supply, management plans, studies, land use, etc.

GSA DATA REQUESTS

TAC AGENDA ITEM #3 GSP DEVELOPMENT SCHEDULE REVIEW

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GSP DEVELOPMENT SCHEDULE

Phase 1 GSP Foundation

Phase 1

• Data Management System (DMS)
• Gather and Compile Data
• Evaluate Numerical Groundwater Model Options
• Stakeholder Communication and Engagement Plan (SCEP)

T

• day

2019

Phase 2 Basin Characterization and Analysis Phase 3 Sustainability Planning Phase 4 GSP Preparation & Submittal

2020 2021 2022 2018

PM Phase Project Management

Oct 2018 Apr 2019 Apr 2020 Apr 2021 Jan 2022

PHASE PM – PROJECT MANAGEMENT & ADMINISTRATION

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(October 2018 – February 2022)

Task 1: Proposition 1 Grant Management, Administration, and Reporting Task 2: Project Management Task 3: Quality Assurance/Quality Control

EKI - Provide a supporting role to Sacramento County to satisfy Prop 1 grant administration and reporting requirements GSAs - provide any required, GSA-specific materials to the County for Prop 1 reporting purposes EKI - Conduct project management efforts: Project budgets, project schedules, records management, contract compliance EKI – prepare a QA/QC Plan

PHASE 1 – GSP FOUNDATION

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(October 2018 – April 2019)

Task 6: Compile Information on the Plan Area and Basin Management Activities Task 4: Select or Design Data Management System (DMS) Task 5: Gather Available Data and Compile into DMS

EKI - Develop options for DMS selection and/or development and prepare associated work products (TM #1- Data Management System Evaluation and Selection) Working Group – Review and provide feedback on TM #1; Select a DMS EKI - Provide technical support required to populate and manage the Basin DMS GSAs – Compile and provide local and Basin-specific data to be included in the Basin DMS EKI - Provide technical support required to compile information on the Plan Area and Basin Management Activities GSAs - Respond to data requests regarding information required in the Plan Area

PHASE 1 – GSP FOUNDATION

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Task 9: Refine Stakeholder Communication and Engagement Plan Task 7: Conduct Data Gaps Assessment Task 8: Evaluate Numerical Groundwater Model Options

EKI - Conduct Basin-wide data gaps assessment and prepare associated work products (Draft TM #2 – Data Compilation and Data Gaps Assessment) GSAs – Identify local data gaps and collect appropriate information for Technical Support Services Grant application Working Group – Review and provide feedback on TM #2 EKI - Conduct the evaluation of numerical groundwater model options and prepare associated work products (Draft TM #3 – Numerical Groundwater Model Evaluations and Recommendations) Working Group – Review and provide feedback on TM #3; Select modeling approach EKI - Provide limited technical support to review and provide feedback on the SCEP and other associated work products developed by the Water Forum and Consensus Building Institute (CBI). Working Group - Review and provide input to Basin-wide SCEP to align with local outreach goals and objectives

(October 2018 – April 2019)

PHASE 1 – GSP FOUNDATION

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Task 10: Conduct Stakeholder Engagement Related to the GSP Foundation Phase Task 11: Participate in Intrabasin & Interbasin Coordination Efforts

EKI – Provide limited support to the Water Forum and CBI to conduct preliminary stakeholder engagement-related activities, including: Preparation of one stakeholder workshop presentation, attendance at one stakeholder workshop Working Group/GSAs – Begin to implement the SCEP within local jurisdictions (meetings, stakeholder survey, public notices, etc.) EKI – Provide technical support for Phase 1 intrabasin and interbasin coordination efforts through attendance at regular Working Group/TAC meetings and preparation of associated materials, attendance at regular SGMA meetings in neighboring subbasins (up to one per month), and through as needed as GSA-specific outreach Working Group - Attend regularly scheduled Working Group/TAC meetings to provide input on matters associated with GSP development

(October 2018 – April 2019)

REMAINING PHASES

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Phase 2: Basin Characterization and Analysis

• Focuses on technical

analysis of Basin conditions.

• Hydrogeologic

conceptual model

• Groundwater

conditions

• Water Budget

Phase 3: Sustainability Planning

• Focuses on planning

for the sustainable management of the basin

• Sustainability Criteria
• Monitoring
• Projects &

Management Actions

Phase 4: GSP Preparation and Submittal

• Preparation of the GSP

and associated deliverables for use by Basin GSAs in adopting the GSP, with subsequent submittal to DWR

(April 2019 – April 2020) (April 2020 – April 2021) (April 2021 – February 2022)

TAC AGENDA ITEM #4 GROUNDWATER MODELING

OBJECTIFIES FOR MODEL SELECTION

 Support GSP development  Support adaptive management through GSP implementation  Coordinate with other regional planning efforts, current and future

 GSP development on ESJ Subbasin  GSP development in other Sac County basins  Regional planning efforts by SAFCA and others

MODEL CONSIDERATIONS - COSUMNES GSP

• 1. Support water budget calculations (past, current, and future).

i.

Proportional contribution of Cosumnes River recharge to South American and Cosumnes subbasins

ii.

Proportional contribution of Dry Creek and Mokelumne River recharge to Cosumnes and ESJ subbasins

• iii. Subsurface flows across subbasin boundaries
• 2. Project future hydrologic conditions:

i.

Groundwater levels

ii.

Streamflow depletions

• iii. Land subsidence potential

MODEL CONSIDERATIONS - COSUMNES GSP

3.

Calculate the groundwater storage response to potential management actions, projects, and climate change

4.

Assist with development of Sustainable Management Criteria

5.

Prioritize data gaps and refine monitoring network over time

PRACTICAL CHARACTERISTICS FOR NUMERICAL MODEL

• 1. Model mesh and simulation period (appropriate spatial and temporal

resolution)

• 2. Reliable and physically based boundaries
• 3. Physical processes accurately represented
• 4. Ease of use: modifications, refinement, and transparency of input and
• utput dynamics
• 5. Cost (as-is, adaptation, new)
• 6. Effectiveness for its purpose: water budget calculations and sustainability

planning

AVAILABLE MODELING OPTIONS

Model Existing

“AS-IS” Updated

( )

New

ESJ SacIWRM SVSim C2Vsim-FG CVHM

AVAILABLE EXISTING MODELS

SacIWRM C2VSim-FG SVSim CVHM

QUESTIONS FROM SEPTEMBER 19, 2018 MEETING

What is the best quality of representation for the Cosumnes Subbasin?

1.

It would be useful to have a better understanding of the role of mesh in the model.

2.

How do the outputs from [either of these two] models:

• help understand movement of water between basins?
• interface with other basins’ models?

3.

How do you add new conductivity data to the model?

4.

Is there an unsaturated zone layer?

5.

How do these models fit with the Cosumnes’ deadlines?

6.

What is the cost difference between these? What is the opportunity cost (i.e. how would remaining funds be allocated)?

7.

What difference is there among models with regard to autonomy and their independent use?

• 1. MESH CALCULATES APPROXIMATE SOLUTION TO

GROUNDWATER-FLOW EQUATIONS.

Rectangles approximating a curve: Narrower rectangles More accurate approximation

• 1. FINER MESH (SMALLER CELLS) REDUCES ERROR

Cells approximating an area: Smaller cell area More accurate approximation

COSUMNES SUBBASIN REPRESENTED IN C2VSIM-FG MESH

COSUMNES SUBBASIN REPRESENTED IN CVHM GRID

GUIDELINES FOR SELECTING MESH/GRID DESIGN

 Expected shape of the water table/potentiometric surface (e.g., mounding or

drawdown).

 Variability in water transmitting and storage properties.  Variability in recharge, pumping, and surface-water groundwater interactions.  Size of the model area.

• Minimize nodes for computer storage and model operation time.
• Compromise between accuracy and practicality.
• Represent system accurately.
• Need to select/utilize meaningful boundaries.

• 2. MODEL INTERFACE WITH GROUNDWATER LEVELS,

FLOWS, OR BOTH.

“BASIN” “GSA”

INTERFACING WITH NESTED MODELS.

IWMF

• Element nodes
• Parametric grid

MODFLOW

• Cell by cell
• 3. HOW DO YOU ADD WATER STORAGE AND

TRANSMITTING PROPERTIES?

IWFM

 C2VSim-FG = YES  SVSim = YES  SacIWRM (UPDATED) = ?

MODFLOW

 CVHM = NO

• 4. IS THERE AN UNSATURATED LAYER?

Note: simplified, one-dimensional vertical flow only.

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• 5. MODELING TIME LINE AND COSUMNES DEADLINES

Phase 1 GSP Foundation

2019

Phase 2 Basin Characterization and Analysis Phase 3 Sustainability Planning Phase 4 GSP Preparation & Submittal

2020 2021 2022 2018

PM Phase Project Management

Oct 2018 Apr 2019 Apr 2020 Apr 2021 Jan 2022

Task 8 Task 14 & 15 Phase 3 Phase 4

Evaluate Numerical Groundwater Model Options

• Develop/Repurpose

Numerical Groundwater Model

• Develop Basin-Wide Water

Budget Use Model Results to Develop Sustainable Management Criteria Finalize Model Results Visualizations to be included in the Complete Draft GSP

SVSim CVHM Cosumnes SacIWRM (updated) C2VSim-FG

Reported Release Dates

• 6. ESTIMATED MODEL DEVELOPMENT COSTS IN

PREPARATION TO SUPPORT GSP

 Characterize uncertainty of existing model and use a-is (~ $50,000-$100,000)  Update/Refurbish existing model (~ $100,000-$200,000)  Construct new “stand alone” or “nested” model (~ $250,000)  Prop 1 Budget: $247,000

• 7. OPTIONS, AUTONOMY AND INDEPENDENT USE

Supporting Agency DWR USGS Work Group Source Code (Engine) IWFM MODFLOW IWFM/MODFLO W Application SVSim SacIWRM (updated) C2VSim-FG CVHM Cosumnes Basin Average Element Area in Cosumnes Basin (acre) 205** 106 393 640 ? Layers 9 3 4 10 ? Autonomy (1-3)* 2 1 2 2 3

* 1= Multiple Entities; 2 = State/Federal only; 3 = Local only ** Entire model area

NEXT STEPS

 Complete model evaluations (February 2019)

• Detailed review of CVHM (current version)
• Detailed review of CV2Sim-FG (when released)
• Others if/when available

 Prepare model to support GSP (April 2019)  Employ model to develop GSP (April 2020)

WG AGENDA ITEM #2 UPDATE FOR ESJ SUBBASIN

ESJ GWA 10/11 MEETING SUMMARY

 Each GSA was requested to provide a preliminary list of potential projects and/or

management actions to include in the GSP

 Requested project details: Project Name, Submitting GSA, Other Participating Agencies, Basic Project

Description, Project Size (i.e. volume of added supply or demand reduction), Project Costs (capital, O&M), Planning Horizon (timeline)

 22 potential projects were submitted by GSAs as of October 10

 Direct/In-Lieu Recharge (5),  Surface Water Supply Augmentation (6),  Recycling/Transfers (5),  Conservation (4),  Stormwater (2)

ESJ GWA 10/11 MEETING SUMMARY

 The TAC identified and ranked assessment criteria for which to evaluate potential projects for

inclusion into the GSP, in the following order:

• 1. “Implementability” (i.e., feasibility & time constraints)
• 2. Unit Cost (i.e., cost per unit supply augmentation or demand reduction)
• 3. Environmental Benefits/Impacts
• 4. Location (i.e., relative to known and/or anticipated impacts)
• 5. DAC Presence & Benefits
• 6. Water Quality Benefits/Impacts

 List of potential projects will be further evaluated and narrowed down based on evaluation

criteria at next month’s meeting

 Final project list should, at a minimum, cover the long-term groundwater deficit calculated from the projected

water budget (~30,000 AFY)