1. 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

2. 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)

3. 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

4. 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 training 40 need HEC-RAS steady flow 54 need HEC-RAS unsteady flow 17 who need unsteady flow training but do not need steady flow

5. 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)

6. 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

7. 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