September 4, 2012California Department of Water Resources

Central Valley Floodplain Evaluation and Delineation (CVFED) Program

Presented for theFMA 2-D Modeling Symposium

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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

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CVFED Product Delivery Team

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CVFED Study Area

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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)

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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

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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

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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

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CVFED 2-D Model Domains

*Preliminary as of 6/19/2012.

FLO-2D Model Domain Square 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 River 17

Total 6,852

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

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Questions & Comments

For more information contact:Yiguo Liang

yliang@water.ca.gov916.574.1408