September 4, 2012 California Department of Water Resources Central Valley Floodplain Evaluation and Delineation (CVFED) Program Presented for the FMA 2-D Modeling Symposium

2 CVFED Principle Objectives Develop foundational datasets, models, and tools to support legislative mandates and other FloodSAFE Programs Develop informational floodplain maps and provide necessary information to cities and counties for their determinations related to urban level of flood protection Develop new hydraulic models acceptable to USACE and FEMA Provide information to support future planning studies and projects

3 CVFED Product Delivery Team

4 CVFED Study Area

5 CVFED Model Approach and Platforms  Calibrated 1-D riverine models for the State Plan of Flood Control systems (HEC-RAS)  2-D hydraulic models representing floodplains outside of the riverine systems (primarily FLO-2D)

6 CVFED 2-D Model Purpose  Primarily to perform floodplain delineations and overbank flood flow routings  To help define storage areas for riverine HEC-RAS models

7 CVFED FLO-2D Model Construction  Grid set-up  Hydraulically significant overbank features such as levees, roads, and other embankments and openings  Hydraulically significant overbank streams or interior drainage canals

8 CVFED FLO-2D Model Domains *Preliminary as of 6/19/2012. FLO-2D Model Domains  25 domains  Five modeling teams  Approximately 6,850 square miles

9 CVFED 2-D Model Domains *Preliminary as of 6/19/2012. FLO-2D Model DomainSquare Miles Upper Sacramento (CH2M Hill)1,603 Lower Sacramento (Wood Rodgers)2,055 Lower San Joaquin (HDR)648 Upper San Joaquin (RBF)2,529 Middle Creek and North Fork Feather River17 Total6,852

Addressing Modeling Challenges Multiple Teams  Four geographic regions assigned to separate engineering support teams based upon their experience and knowledge of the study area  Program Management team to support DWR  Formation of H&H Coordination Work Group to discuss and share technical issues and how to resolve  Establish Program Guidelines, Standards and Procedures

Addressing Modeling Challenges Model Development Time  Developed Tools to Increase Efficiency and Improve Accuracy  FLO-2D GDS  FLO-2D Workshop with Software Developers

Addressing Modeling Challenges Formalize QA/QC Review Process  Checklists tracking QC and QA comments and resolution  Development of SharePoint site  Bi-Weekly Model Review Meetings

Addressing Modeling Challenges Models, Technical Memorandums and Workmaps  Documentation acceptable to FEMA, USACE and DWR  Accessible in DWR Library of Models and intended to support future users of the models

14 Questions & Comments For more information contact: Yiguo Liang