FLDWAV to HEC-RAS Transition

• Software Development (HEC-RAS into CHPS)• Science and Modeling

– Develop and evaluate model transition procedures– Build HEC-RAS models that can replace FLDWAV

models • Validate in calibration mode• Implement converted models within CHPS• Validate in forecast mode (parallel operations)

• Training

Challenge: Replace FLDWAV and DWOPER in NWSRFS with HEC-RAS in CHPS

Accomplishments To Date• Software Development

– Initial functional requirements defined (March 2008)– HEC recompiled FORTRAN engines in Linux (Fall 2008)– Deltares, HEC, and Resource Management Associates built FEWS

adapter (Fall 2008 – Spring 2009)– Software Acceptance Testing (June 17, 2009)

• CHPS HEC-RAS passed 15 of 16 tests• 13 additional tests remain

• Science and Modeling Component– HSMB has worked closely with NW & NE RFCs to convert their models– HSMB prepared conversion tools and documentation

• “Guidelines for the Transition from FLDWAV to HEC-RAS; Forecast Implications and Transition Tools” (81 p.)

• HSMB presented a summary paper at ASCE-EWRI

• Training– HEC delivered steady-state HEC-RAS training

• (NSTEP funded; April 2009)– HSMB delivered unsteady-state and model conversion training

• for CAT RFCs at NERFC (April 28)

Remaining Tasks• Software Development

– Deltares to work with HEC/RMA on outstanding technical issues in July 2009

– These issues do not prevent CAT RFCs from starting to use HEC-RAS in CHPS

– Deltares, NWRFC, OHD to add additional test for blend operation– Final software acceptance testing in September 2009

• Science and Modeling– Implement converted CAT models in CHPS– Validate CAT in forecast mode (parallel operations)

• starting October 2009

– Assist remaining RFCs with model conversions and implementations

• before October 2010

Near Term Training Needs• Completing the CHPS Transition

– Deltares to prepare “How To” Document for configuring HEC-RAS in CHPS– Deltares to add more HEC-RAS info to their Migration & Config Training – “Advanced” Unsteady and Model Conversion Training for non-CAT RFCs

• suggested for FY10 Q1-Q2• In New Orleans? (Dave Reed offering to host)• NSTEP funds?• Taught by HEC and/or HSMB?

• Building New Models – HEC-GeoRAS and model building training (sometime in FY10)

• A course tailored to NWS needs will save money • Workshops where participants can work on their own models are highly

beneficial• HSMB can present GoToMeetings on selected topics

• Dam Break Modeling (suggested for FY10 Q3-Q4)

Hydraulics Training Survey:Of 126 RFC staff at 10 RFCs:

31 need basic hydraulics training40 need HEC-RAS steady flow54 need HEC-RAS unsteady flow17 who need unsteady flow training but do not need steady flow

River RFC Model AS BSS FKECInternal Boundaries KFLP

N=f(flow,elev) 4Digit n Levee MIXF KPRES Wind

1 Hudson river NERFC FLDWAV n n n 0 flow y n 5 0 n2 Connecticut-hartford NERFC FLDWAV n y n 0 flow y n 5 0 n3 Champlain-rouses NERFC FLDWAV y n n 0 flow n n 0 0 n4 Juniata MARFC FLDWAV n n n 0 flow y n 5 0 n5 Juniata MARFC FLDWAV n n n 0 flow y n 5 0 n6 Susqehanna MARFC FLDWAV y y n Dam 0 flow y y 5 0 n7 Red River (Wahpeton to Halstad) NCRFC FLDWAV n n n 0 flow n n 0 0 n8 Miss/Minnesoty (St Paul to Anoka/Mankato) NCRFC FLDWAV y y n Lock and Dam 0 flow y n 0 0 n9 Lower Des Moines River NCRFC FLDWAV n n n 0 flow n n 0 0 n10 Grand River (Grand Rapids to Grand Haven) NCRFC FLDWAV n n n 0 flow y n 0 0 n11 Red River (Halstad to Emerson) NCRFC FLDWAV n n n Bridges 0 flow y n 0 0 n12 Mississippi River (St. Paul to Dam 10) NCRFC FLDWAV n y n Lock and Dam 0 flow y n 0 0 n13 Wapsipinicon River (Anamosa to Conf) NCRFC FLDWAV n n n 0 flow y n 0 0 n14 DesMoines (DESRACDW) NCRFC DWOPER n y n Lock and Dam n/a flow y n n/a n/a n15 Lower Grand River (GNDDW) NCRFC DWOPER n y n n/a flow y n n/a n/a n16 M1022DW NCRFC DWOPER n y n Lock and Dam n/a flow y n n/a n/a n17 Merger (MISILODW) NCRFC DWOPER n y n Lock and Dam n/a flow y n n/a n/a n18 St Johns SERFC FLDWAV n y n 0 flow y n 0 0 n19 Tar River (RFC) SERFC FLDWAV n n n Dam 0 flow n n 5 0 n20 Tar River (RFC) SERFC FLDWAV n y n Dam 0 flow n n 5 0 n21 Tar River (Rti) SERFC FLDWAV n y y Bridges 0 flow n n 0 0 n22 Coquille River NWRFC FLDWAV n y n 0 flow n n 0 0 n23 Lower Columbia NWRFC DWOPER y y n Dam n/a flow y n n/a n/a n24 Lower Umpqua NWRFC FLDWAV n y n 0 flow n n 0 0 n25 Big Bay Dam LMRFC FLDWAV n n n Dam 0 elev n n 5 0 n26 Pearl/Ross Barnet Dam LMRFC FLDWAV n y n 0 flow y n 5 0 n27 Vermilion LMRFC FLDWAV n n n 0 flow y n 5 0 n28 Mississippi LMRFC FLDWAV y y n 0 flow y n 0 0 n

FLDWAV Model Inventory

• Inventory helped prioritize work on our conversion routines• In a few cases, multiple decks are listed for the same river• Must convert ~ 25 decks to achieve identical capability to existing

operations (this number may be out of date but is probably close)

NWS Funded HEC-RAS Enhancements for CHPS

• Allow definition of flow roughness factors on any flow intervals (e.g. non-uniform increments)

• Compile HEC-RAS Engines to run on Linux– Unsteady.exe– Steady.exe– GeomPreprocessor.exe– DSSWriter.exe

• Enhance HEC-RAS to save model states at user controlled intervals

Other Notable HEC-RAS Enhancements in the Works

• Expansion and contraction force term for unsteady flow calculations (in v. 4.0.1 to be released this summer)

• Automatic calibration (planned for v. 4.1)

• RAS Mapper – standalone inundation mapping tool for Windows