Ventura River, Ventura and Santa Barbara Counties
Ventura River Information
- April 2026
- Model Documentation Report, with input from CalEPA External Scientific Peer Review
Peer Review Package
The peer review package contains the following documents compiled into a single file.
- October 17, 2025 – CalEPA External Scientific Peer Review Program Final Response to the Request for External Scientific Peer Review of the Scientific Basis of a Ventura River Watershed Groundwater-Surface Water Model
Attachments:
- 1: Request for External Scientific Peer Review of the Scientific Basis of a Ventura River Watershed GW-SW Model October 11, 2024.
- 2: Letters to Reviewers Initiating the Review
- i. James W. Jawitz, Ph.D.
- ii. George M. Hornberger, Ph.D.
- 3: Guidance to Reviewers, posted at FTP site
- 4: Curriculum Vitae
- i. James W. Jawitz, Ph.D.
- ii. George M. Hornberger, Ph.D.
- 5: Email from CalEPA External Scientific Peer Review Program to reviewer (Jawitz) requesting subsequent review, including supporting documents.
- 6: Email from CalEPA External Scientific Peer Review Program to reviewer (Hornberger) requesting clarification, including supporting documents.
- 7: Web Accessible Reviews
- i. James W. Jawitz, Ph.D.
- ii. George M. Hornberger, Ph.D.
- iii. George M. Hornberger, Ph.D. (addendum for clarification)
- iv. James W. Jawitz, Ph.D. (subsequent review)
- June 2024
- Groundwater-Surface Water Model for the Ventura River Watershed
- Model Documentation Report for the Groundwater-Surface Water Model for the Ventura River Watershed
- Peer Review Request Letter for VRW GW-SW Model and Report (link coming soon)
- Response to Comment Table for the (2021) Draft VRW GW-SW Model and Report
- February-March 2022
- Tables for Draft Data Visualization Tool for the Draft Groundwater-Surface Water Model for the Ventura River Watershed
- Overview of Draft Ventura River Watershed Groundwater-Surface Water Model Webinar (video)
- Draft Groundwater-Surface Water Model Technical Training:
- Notice of Webinar and Training on Draft Groundwater-Surface Water Model For Ventura River Watershed
- Notice Soliciting Comments on Draft Groundwater-Surface Water Model and Model Documentation Report
- December 2021
- October 2021 – Ventura River Watershed GW-SW Model: Scenarios Methodology Webinar (Video)
- August 2021 - Preliminary Draft Groundwater-Surface Water Model of the Ventura River Watershed
- May-June 2021 - Ventura River Watershed Modeling Webinar Series
- Webinar 1 (video): Groundwater-Surface Water and Nitrogen Transport Models: Overview, Status, and Updates to Geologic Analysis
- Webinar 2 (video): Groundwater-Surface Water Model: Water Supply and Demand
- Webinar 3 (video): Groundwater-Surface Water Model: Preliminary Draft Calibration, Next Steps, and How to Stay Involved
- Notice of Public Comment Period for Ventura River Watershed Modeling Webinar Series
- October 2020 - Draft Sensitivity Analysis Approach Memo for the Development of the Groundwater-Surface Water Model of the Ventura River Watershed
- July 2020 - Draft Data Compilation Report for the Development of Groundwater-Surface Water and Nitrogen Transport Models of the Ventura River Watershed
- March 2020 - Geologic Analysis, Ventura River Watershed
- December 2019 - Final Study Plan for the Development of Groundwater-Surface Water and Nutrient Transport Models of the Ventura River Watershed
Announcement
New! April 6, 2026 – The external peer review process of the State Water Board’s Ventra River Watershed (VRW) Groundwater-Surface Water (GW-SW) Model Report is complete. The peer review was completed through the California Environmental Protection Agency’s (CalEPA’s) External Scientific Peer Review process. Documents associated with the peer review process, including the peer reviewers’ comments and corresponding responses are available on the Board’s Ventura River watershed webpage.
Stay Connected
To receive emails regarding the Water Boards’ model development and related California Water Action Plan efforts, please subscribe to the “California Water Action Plan/Statewide Instream Flows”
Check your email account for a confirmation email to complete your subscription.
See our Subscription page for additional email lists.
