Calibration of Unsteady HEC-RAS Model for Complex Overflowing Channels – CVFED Sacramento River Model near the Flood Relief Structures Flood Management Association 2014 Annual Conference September 3, 2014 Presented by Chakri Malakpet, PE Mark Glidden, PE Alan Turner, PE, CFM CH2M HILL
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Calibration of Unsteady HEC-RAS Model for
Complex Overflowing Channels – CVFED
Sacramento River Model near the Flood Relief
Structures
Flood Management Association 2014 Annual Conference
September 3, 2014
Presented by
Chakri Malakpet, PE
Mark Glidden, PE
Alan Turner, PE, CFM
CH2M HILL
Overview of the Presentation
DWR CVFED Program Objectives
Current Study Area Overview
Calibration Challenges
Methodology and Processes Used
Lessons learnt and tips for HEC-RAS Users
DWR Central Valley Floodplain Evaluation
and Delineation (CVFED) Program
Develop foundational datasets, models, and tools associated with
SPFC to support State’s flood management programs and projects
Improve quality and accuracy of flood hazard data to help local
communities comply with (recent) legislative mandates (SB 5, AB
156, SB 1278/AB 1965, etc.)
Develop new hydraulic models acceptable to the USACE and
FEMA and available for use for future studies.
Provide information to support future planning and project design
DWR Central Valley Floodplain Evaluation
and Delineation (CVFED) Program
CH2M HILL was tasked to develop an unsteady HEC-RAS
model for the Sacramento River System
Model extents are from Hamilton City to Fremont Weir
Consists of complex network of levees, weirs, inline structures,
flood relief structures and bypass channels
CH2M HILL Study Area
HEC-RAS and FLO-2D
Upper Sacramento River System
Mainstem
Colusa Drain
Knights Landing Ridge Cut
Sutter Bypass
Cherokee Canal
Butte Creek
Chico Areas Streams
Mud Creek
Sycamore Creek
HEC-RAS only
Deer Creek
Elder Creek
HEC-RAS System Model
Un-leveed main stem Sacramento River upstream of
RM 183.5 on Right Bank
RM 174 on Left Bank
Tributary channel inflows
Mud Creek
Big Chico Creek
Stony Creek
Butte Sink - Natural Bypass
Flood Relief Structures (FRS)
M&T
3B’s
Goose Lake
Meandering low-flow channels
3D Animation of the Terrain
Calibration Challenges
HEC-RAS Model was Calibrated to Observed Flow, Stage and High Watermark Data
Complex Natural 3D Hydraulic Functions represented as 1D System
Overflows from the River, through FRS enter into Butte Sink
Similar Water Surface in the River and Butte Sink create dynamic flow exchange between the channels