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We have also developed a number of Stormwater Pollution Prevention Plans (SPPPs) for companies such as Amerimark Building Products, ALSCO Aluminum Products, and Mebane Packaging. These plans have dealt with site specific stormwater needs at each facility.
Watershed Modeling
When the FEDEX expansion project at the Piedmont Triad International Airport in Greensboro needed a nutrient analysis to obtain environmental permits, our firm conducted detailed watershed modeling within the 92-square mile project area to demonstrate pre- and post-project conditions. Watershed models allow for sensitivity analyses of various land use strategies providing decision makers with the necessary tools to evaluate project impacts. Watershed modeling tools have included AnnAGNPS, CCHE1D and SWAT primarily used for Indirect and Cumulative Impacts studies.
Stream Restoration
Natural stream design using fluvial geomorphic techniques is an innovative way to replace lost functions when a stream is impacted by development. Our water resources engineering skills are necessary to support these design services. HEC-RAS and HEC-HMS modeling help define hydrologic stream characteristics. Our engineers develop construction plans and bid documents supporting implementation of the project. By using good engineering and strong science, successful stream restoration can be achieved.
Hydrologic and Hydraulic Engineering
By using computer models, we are capable of evaluating entire watersheds or a simple piped stream crossing. River hydrodynamics and flood stages can be modeled to determine potential bank degradation and flood prone areas. GIS data are integrated into the process to visually display model results. We use traditional hydraulic models such as HEC-RAS and HEC-HMS to predict water levels and hydraulic flow characteristics, however we have expanded the use of these tools in innovative ways such as to forecast influences on endangered mussels by analyzing shear stress thresholds. We believe these models can be exploited for other purposes such as an evaluation of
the benefits attributed to a mitigation site, the need (or lack of need) for land use controls, and impacts to other aquatic organisms.
Best Management Practices (BMPs)
BMPs are now required for activities ranging from implementation of forest roads to detailed site development. Our engineers recommend site specific strategies (rain gardens, permeable pavers, green roofs, stream buffer design, and discrete catchment basins) or design full scale facilities, such as large stormwater basins and stormwater conveyance structures, as BMP controls.
Whether your needs are a simple stormwater strategy for site development or detailed hydrological analyses for road crossings or watershed evaluations, we have the capabilities to assist. Our goal is to insure that our water resources engineering skills help make your project succeed.
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