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

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

MODEL CRITERIA Ranked Criteria Pass / Fail Criteria (Weighted and Unweighted)  Release Date - The model needs to be available Following criteria listed in order of importance to support Cosumnes Subbasin GSP recommended by GSA representatives during 19 development; November 2019 webinar: 1. Represents Hydrogeological Conceptual Model  Model Capability - The model must be able to (HCM) accepted by Working Group and employed support water budget development, Sustainable for Cosumnes Subbasin GSP; Management Criteria (SMC) development, and evaluation of Project and Management Actions 2. Supports coordination with adjacent basins and regional water supply planning (e.g., groundwater (P&MAs), among other items necessary for GSP banking); development; and 3. Minimum cost for future maintenance,  Budget – The model development/update must implementation, and adaptive management; be able to be achieved within the available budget. 4. Working Group is primary decision maker; and 5. Schedule allows Working Group opportunity to provide input to model development/update.

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 option for nested model  Compile available data into the DMS  Develop Hydrogeological Conceptual Model

AGENDA ITEM #6 GSP DEVELOPMENT SCHEDULE REVIEW

REMAINING PHASES (April 2019 – April 2020) (April 2020 – April 2021) (April 2021 – February 2022) Phase 3: Phase 2: Basin Phase 4: GSP Sustainability Characterization Preparation and Planning and Analysis Submittal • Focuses on technical • Focuses on planning • Preparation of the GSP analysis of Basin for the sustainable and associated conditions. management of the deliverables for use by • Hydrogeologic basin Basin GSAs in adopting • Sustainability Criteria conceptual model the GSP, with • Groundwater • Monitoring subsequent submittal to conditions DWR • Projects & • Water Budget Management Actions 21