EKI TECHNICAL PRESENTATION #2 COSUMNES SUBBASIN GSP DEVELOPMENT 19 - - PowerPoint PPT Presentation

EKI TECHNICAL PRESENTATION #2

COSUMNES SUBBASIN GSP DEVELOPMENT

19 DECEMBER 2018 COSUMNES SUBBASIN WORKING GROUP / TAC MEETING

AGENDA ITEM #1 GENERAL UPDATES

TSS GRANT

 Amador submitted

for two monitoring wells

 DWR indicated at

ACWA that they have only receive eight requests to date

DATA REQUEST FORMS

 Basin Stakeholders

 Introductory letter  Stakeholder Survey  Data Request Form

 Basin Public Water Suppliers

 Introductory letter  Need missing PWS contact info

 GSA responsible for mailing

ESJ GWA 11/14 MEETING SUMMARY

 Updates on Projects & Management Actions



Nine new projects added since last month: 3 Surface water supply, 3 recharge, 1 recycling/recharge, 2 supply assessments  Project Review



Project & Management Actions will be used to meet “overdraft” of Basin



Projects will be reviewed based on advisory committee criteria: Implementability, location/proximity to area of

• verdraft, cost per volume water savings, environmental benefit/impact, Disadvantage Community benefit,

water quality impact  Update on Water Quality Minimum Thresholds, Monitoring Network



Focus moving away from monitoring salinity “front” and shift toward uniform water quality criteria



Recommended Minimum Threshold of 600 mg/L Total Dissolved Solids (Basin-wide)  TSS Funding Update



Proposing selection of ~ 3 wells to propose for funding

AGENDA ITEM #4 DATA MANAGEMENT SYSTEM DECISION

DATA MANAGEMENT SYSTEM (DMS) EVALUATION

 TM#1 submitted to TAC/Working Group in November 2019  DMS discussed in detail during TAC/Working Group Webinar on 19

November 2018

 EKI responded to two follow up questions in email dated 3

December 2018

 Relative cost  Web-based interface

SIMPLE, CUSTOM DMS IS RECOMMENDED

 The DMS options were evaluated against the following criteria:

 SGMA GSP Regulations;  DWR BMP Guidance;  Public Availability;  Common Use;  Adaptability;  Web Data Interface; and,  Cost-Effectiveness. The Working Group will be responsible for maintaining their system and submitting the information as part of GSP submission and annual reporting.

AGENDA ITEM #5 GROUNDWATER MODELING

GROUNDWATER MODEL EVALUATION

 Numerical Model evaluations discussed during multiple

TAC/Working Group Meetings

 February 2018  September 2018  October 2018

 Ranking criteria and weighting reviewed during TAC/Working

Group webinar on 19 November 2018

 TM#3 submitted to TAC/Working Group in December 2019

SIX MODELS EVALUATED

• 1. California Central Valley Groundwater-Surface Water Simulation Model

Fine-Grid (C2VSim-FG);

• 2. Central Valley Hydrologic Model (CVHM);
• 3. Sacramento Valley Groundwater-Surface Water Simulation Model (SVSim);
• 4. Sacramento Area Integrated Water Resources Model (SacIWRM);
• 5. A custom, stand-alone model developed for the Cosumnes Subbasin; and
• 6. A custom, nested model developed for the Cosumnes Subbasin.

• Sept. 2019

Pass / Fail Criteria

 Release Date - The model needs to be available

to support Cosumnes Subbasin GSP development;

 Model Capability - The model must be able to

support water budget development, Sustainable Management Criteria (SMC) development, and evaluation of Project and Management Actions (P&MAs), among other items necessary for GSP development; and

 Budget – The model development/update must

be able to be achieved within the available budget.

Ranked Criteria (Weighted and Unweighted)

Following criteria listed in order of importance recommended by GSA representatives during 19 November 2019 webinar:

• 1. Represents Hydrogeological Conceptual Model

(HCM) accepted by Working Group and employed for Cosumnes Subbasin GSP;

• 2. Supports coordination with adjacent basins and

regional water supply planning (e.g., groundwater banking);

• 3. Minimum cost for future maintenance,

implementation, and adaptive management;

• 4. Working Group is primary decision maker; and
• 5. Schedule allows Working Group opportunity to

provide input to model development/update.

MODEL CRITERIA

MODEL RANKING – EQUAL WEIGHTING

MODEL RANKING WEIGHTED CRITERIA

CUSTOM NESTED MODEL BEST MEETS CRITERIA

 Best meets Working Group needs for GSP development and

implementation

 Based on the Hydrogeological Conceptual Model developed for the

GSP and accepted by the Working Group

 A nested model improves the subbasin’s representation in the regional

model, and therefore supports coordination with adjacent basins and

• areas. (i.e. groundwater banking projects)

 Model will be custom made for the GSA and makes GSAs the primary

decision makers (e.g., model objectives, schedule, cost, acceptance criteria)

NEXT STEPS FOR MODEL SELECTION AND GSP DEVELOPMENT

 Working Group approval to finalize model selection (January 2019

WG/TAC Meeting)

 Monitor development and release of regional models and select best

• ption for nested model

 Compile available data into the DMS  Develop Hydrogeological Conceptual Model

AGENDA ITEM #6 GSP DEVELOPMENT SCHEDULE REVIEW

REMAINING PHASES

21

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)