Intercontinental Airport : Maple Ridge : Fulshear : Hardy Toll Road
Grounds Anderson, LLC personnel have prepared numerous impact analyses receiving approval from the Harris County Flood Control District, the City of Houston, FEMA, TxDOT, Harris County, the City of Pasadena, Fort Bend County, City of Sugar Land, HCTRA and other jurisdictions across the State of Texas.
We can prepare detention analysis for complex, multi-basin commercial and residential developments, conveyance mitigation for encroachments into streams, flood plain fill mitigation for development in Special Flood Hazard Areas, and capacity allocations for existing closed conduit and channel systems.
We are innovators in the use of Geographic Information Systems for land use impacts on hydrologic basin characteristics; off-site flow determinations; flood plain fill volume calculations; and channel modification impacts.
Drainage Master Plan and Storm Water Quality Master Plan Update, George Bush Intercontinental Airport
As a subcontractor to S&B Infrastructure, Inc. John served as the Deputy Project Manager for the development of the master plans at Bush Intercontinental Airport. The master plan recommended proposed improvements, alternatives to the drainage system, and Best Management Practices to improve water quality for phased development through 2025. Runoff conditions from the existing 10,000 acres of development were determined so that mitigation of runoff from the proposed 14,000 acre airport could be implemented. The master plan included on and off-site improvements to channels, structures, detention ponds, and water quality features. Unique tasks performed by Grounds Anderson, LLC include a FEMA Letter of Map Revision of the entire Garners Bayou Watershed to update Flood Insurance Rate Maps for improvements within the airport and an offsite diversion to Kenswick Ditch; development of a datum adjustment to correct channel and structure geometries for subsidence; creation of a wildlife buffer map to identify areas of potentially increased bird strikes from existing and proposed detention ponds; and coordination with the Harris County Flood Control District.
Maple Ridge Place Letter of Map Revision, Detention Analysis, and Flood Plain Fill Mitigation Plan
Grounds Anderson prepared and obtained a FEMA Letter of Map Revision for Sections 1, 2 and 3 of the Maple Ridge Place Subdivision. The subdivision is within Zone AO (Depth 1) and Zone A from an overflow from channel P148-00-00 to P118-00-00 (Halls Bayou). All work was performed to FEMA standards including the preparation of the Geodatabase of revised Special Flood Hazard Areas (flood plains) to DFIRM Specifications. Grounds Anderson developed Hydraulic (HEC-RAS) and Hydraulic Models (HEC-HMS) for determining the volume, discharge rates, and water surface elevations for pre-existing conditions of the overflow and post development. Post development conditions included the modeling of an interceptor channel/detention pond that captured and diverted the overflow around the subdivision. The channel also provided detention and flood plain fill mitigation for Sections 1 and 2 above the freeboard of the maximum water surface elevation from the detention routing. Cross Sections in the overflow HEC-RAS were developed by intersecting the cross section layout with a LiDAR derived Digital Elevation Model. Flood depths and site inundation limits were developed by intersecting the ground surface derived from the DEM and conventional surveying on the subdivision with the water surface elevations from the HEC-RAS hydraulic model. This was done with ESRI ArcGIS with the Spatial Analyst and 3D Analyst Extensions. Off-site drainage areas and flows that cross the site and enter the diversion channel were determined with the ArcHydro Extension of ArcGIS.
Drainage Study for 2,500 acres in Fulshear, Texas
Grounds Anderson analyzed 2,500 acres in Fulshear, Texas and prepared a drainage study for pre-development conditions for the site in accordance to Fort Bend County Design Criteria. We worked closely with the client to determine future development options and potential impacts to the adjacent property owners.
Hardy Toll Road Drainage Study
Grounds Anderson analyzed the Hardy Toll Road impacts on Melrose Park and Hawthorne Place subdivisions and the tributaries that ultimately outfall into Halls Bayou (P118-00-00). We prepared hydrologic and hydraulic models to determine the impacts of the construction of the Hardy Toll Road on the existing unstudied channels within Melrose Park and Hawthorne Place subdivisions. We presented updated existing condition hydrologic run-off analysis and hydraulic analysis.