In addition, our team will be responsible for floodplain modeling and mapping services for selected watersheds. Moore and Associates, Inc., Crouch Environmental Services, Inc., and Kleinschmidt, will oversee the efforts of other consultants selected by the HCFCD to perform floodplain modeling and mapping services. In that role, our team, which includes Pape-Dawson Engineers, Inc., Walter P. A highly qualified team of engineering firms and drainage professionals has been assembled to complete this effort, with HDR serving as the prime consultant with primary responsibility for project management, oversight, and quality control. HDR has been selected to provide professional engineering, project management and control, and quality control services to support the HCFCD in delivering these important products for the citizens of Harris County. In order to provide this vital information, the Harris County Flood Control District and County leadership have determined that updated Flood Insurance Rate Maps are needed for Harris County, and the District has worked with the Federal Emergency Management Agency to develop a Map Activity Statement to guide the development of updated Risk Map products for all of Harris County’s 22 major watersheds. Most importantly, they need to develop a better understanding of flood risks in order to make key life decisions such as when and where to buy a home, and the flood insurance premiums for that home (all Harris County residents are encouraged to buy flood insurance). They need high-quality, detailed flood risk and hazard maps that are easily accessed and understood. The public wants to rebuild sustainable communities. This demand was evidenced on August 25, 2018, when Harris County voters overwhelmingly supported a $2.5 billion bond program. Halff is currently developing flood maps and technical support data notebooks for the watershed in Harris County.Harris County (which contains the City of Houston) has suffered numerous catastrophic floods over the years, and the public demands progress in terms of flood risk communication and flood damage reduction. In accordance with HCFCD modeling guidelines, Halff developed a comprehensive 1D/2D model of the Spring Creek and its major tributaries to calculate water surface elevations for various Atlas 14 storm events. The models were calibrated to three historical storm events. A preliminary 2D model of the Spring Creek watershed was developed to evaluate sheet flow patterns across the entire watershed, including the counties outside of Harris County. Halff developed a comprehensive hydrologic model using HEC-HMS to evaluate flows and volumes that occur during Atlas 14 design storms. Bathymetric survey was also obtained in the lower portions of Spring Creek which are primarily underwater. Halff developed a field survey plan that identified which areas and channel segments needed to be surveyed to better define the hydrologic and hydraulic analysis. ![]() ![]() ![]() The watershed lies in four counties in Texas: Montgomery, Waller, Grimes and Harris. The Spring Creek watershed has over 83 miles of streams that were studied as part of the project and over 68 miles of the mainstream was modeled for the mapping program. Halff was selected by Harris County Flood Control District (HCFCD) to develop new floodplain maps for the Spring Creek watershed. The Federal Emergency Management Agency (FEMA) gave Harris County special permission to use new hydrologic and hydraulic modeling methods. The purpose of the Modeling, Assessment and Awareness Project (MAAPNext) is to better understand flood risks within the 22 watersheds in Harris County, Texas, while using the latest adopted National Oceanic and Atmospheric Administration (NOAA) rainfall frequency values (Atlas 14, Volume 11) and improved modeling methods.
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