Watershed Assessment and Management

GBMc & Associates has significant experience in the area of watershed management.  Detailed watershed analysis and characterization studies have been completed to identify causes/sources of stream corridor disturbance and potential measures to restore natural conditions and protect water quality.  Experience includes; point source and non-point source pollutant loading assessments, flow studies, geomorphic surveys, stream and riparian habitat assessments, landuse/landcover assessments, rapid bioassessments, and water quality modeling.  Assessment findings have led to development of watershed management plans and protection strategies including; best management practices (BMP’s), storm water treatment features and aquatic habitat restoration.  Key elements of our experience are provided below.

Experience and Capabilities

  • Completed multiple watershed scale studies to determine the source(s) of water quality degradation and the potential means to reverse the decline in quality.  Studies have been completed on various size watersheds from small (<15 mi2) to large (10,000 mi2).
  • Have completed detailed watershed management plans for urban and rural watersheds which included assessment and development of management options.  Each process has involved stakeholders and associated economic considerations.
  • Conducted hundreds of stream and riparian habitat assessments including quantitative geomorphic measurements, and qualitative cover determinations.  Habitat data has been used to assess stream stability, potential for maintenance of biological integrity, and for determination of potential non-point source pollution impacts.
  • GBMc scientists are experienced in stream characterization and restoration procedures as developed by Rosgen (1996).   They are proficient in the use of geomorphic assessments/surveys for application in natural channel design and for evaluation of a channels restoration potential.
  • Utilized detailed geographical information system (GIS) data, including landuse/landcover data, aerial photography, satellite imagery, infrared aerial photography, and topographic maps, to characterize and assess potential sources of pollution entering a stream corridor.
  • Developed detailed habitat restoration plans for diverse habitat types including wetlands, uplands, riparian areas, and lakes.  Restoration studies and implementation have included soils assessments, surveying and engineering of surface elevations, use of geotechnical materials, oversight of construction, and vegetative planting plans.
  • GBMc engineering staff is experienced in the development of BMP’s and storm water treatment practices to control non-point source pollution and to mitigate storm flow hydrographs in critical watersheds.  In addition, low-impact development (LID) techniques are a part of the storm water pollution prevention toolbox utilized by GBMc in watershed management. 

GBMc Contacts Shon Simpson or Greg Phillips