Harris County Flood Control District Tropical Storm Allison Recovery Project, Houston, TX

Harris County Flood Control District Tropical Storm Allison Recovery Project, Houston, TX

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Hydrologic analysis of 872 square miles (approximately one-third of Harris County), covering four watersheds – Cypress Creek, Spring Creek, White Oak Bayou and Willow Creek – following Tropical Storm Allison and the subsequent remapping of area floodplains with new hydrologic and hydraulic studies. RPS:

  • Developed hydrographs using the Clark unit hydrograph and modified Puhls routing technique.
  • Used HEC-HMS, HEC-RAS, HEC-GeoHMS, HEC-GeoRAS and ESRI software (ArcMap, Spatial Analyst, and 3-D Analyst) to develop the hydrologic parameters and establish peak flow rates.
  • Coordinated closely with program managers for FEMA and Harris County Flood Control District to monitor progress and technical issues.
  • Worked with the hydraulic consultant on our watersheds to jointly develop compatible HEC-HMS and HEC-RAS models and to extract hydrologic parameters from the HEC-RAS models.
  • Calibrated the HEC-HMS models to existing U.S.  Geological Survey stream flow data.
  • Developed HEC-RAS models to evaluate major overflows out of two of the watersheds.