![]() ![]() ![]() If the project has “no rise”, FEMA is generally satisfied but does not update the model set. FEMA’s model maintenance procedures work for the flood insurance program, but fall short of HCFCD goal. FEMA does not update model data set and the models quickly become out to date and there is no one model which represents all of the approved LOMCs for the stream. This issue above can be addressed through better coordination. However, FEMA may inadvertently supersede that model by approving the resultant second model. Model Management How ? Model Management Continuous Updates Watershed Wide Updates M3 is the Support SystemĬontinually update the models and associated data sets due to changes in Floodplain and Floodways which require a LOMR Challenges: Many LOMRs throughout Harris County Multiple LOMR projects – one stream When FEMA approves the first LOMC project, they will issue a LOMC that will re-establish the model. Must use effective models, Grand Father period is quickly approach (Work with HCFCD). Truncation: Not a problem any more, look at the entire channel reach – Section 4.3.3 Current Model/Tracking Number: Ensures the user has the most current model – Section 5.2 Cross Section: New Cross Sections (Survey TOB to TOB / Lidar Overbanks) – Section 3.4.2 Nomenclature Change: The effective models are different than the Preliminary Models on the DVD. Model Version (HEC-HMS/HEC-RAS) HEC-HMS (v3.3.0) HEC-RAS (v3.0.1) No model truncation (Section 4.3.3) Use current model set (Section 5.2) Tracking number (Section 5.2) New/modified cross sections (Section 3.4.4) Nomenclature change (Section 3.2) Version: The versions of HEC-HMS and HEC-RAS can always be found on the home page of the M3 website. Purpose Maintain the integrity of the models and supporting data Ensure model modifications are made in a consistent manor so others can easily understand changesġ3 Model & Map Standards Channel Cross Sections tied to LiDAR HEC-HMS The Scale of Our Work Identified Flood Plainsĩ Why Model Management? Protect the investmentĬurrent and accurate Information to local community & FEMAĬontinually manage and maintain the integrity of the effective model set Foster a partnership between HCFCD and the Floodplain Administrators Facilitate and expedite model and data distribution Coordinate concurrent development activities in watersheds HCFCD becomes Cooperative Technical Partner (CTP) – 2000 Tropical Storm Allison Recovery Project (TSARP) – JNew LiDAR topo, new models and maps Total Project Cost = $32 Million ($16M – HCFCD and $16M – FEMA) Stats 144 FIRM panels 1300 miles studied 22 watersheds New Network of Benchmarks New Topo HMS RAS DFIRMs We must protect the investment ![]() 14 (HCFCD Agreement with FEMA) LOMR Delegation 1 Harris County Flood Control District Model and Map Maintenance ProgramĪtaul Hannan, P.E., CFM Harris County Flood Control District National Flood Workshop Houston, TX, October 24-26, 2010Ģ Overview Harris County Overview Model Management ![]()
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