Watershed and Water Quality Studies and Modeling

To help clients achieve stringent water quality goals, Geosyntec provides rigorous assessment and modeling services that determine the sources and factors that affect the delivery of critical pollutants across a watershed.

Through our comprehensive studies and analysis we provide technically defensible tools and approaches that can be used in the development of Total Maximum Daily Load (TMDL) calculations and watershed protection plans. In addition, we frequently turn to Use Attainability Analyses to examine site-specific water quality criteria that affect attainability goals under natural, human-caused, and economic conditions.

Our hydrodynamic and water quality models integrate inputs from point and non-point sources and help our engineers and scientists best determine impacts on water quality in receiving water. These models allow us to determine assimilative capacities of a given body of water, propose best management practices that can affect pollutant impacts, or predict the time required for a system to recover after being altered in some way.

Using watershed studies, water quality monitoring, and hydrological and hydrodynamic modeling, we also can assess compliance with local, state, and federal water quality standards and are better able to evaluate the magnitude, frequency and duration of impacts of a wide variety of pollutant sources. Our practitioners offer extensive experience with geographic information system applications for spatial analysis, planimetric and thematic mapping, and data representation.

Among the watershed models we employ are the Watershed Characterization System (WCS), Better Assessment Science Integrating Point and Nonpoint Sources (BASINS), and the Watershed Assessment Model (WAMView), to name just a few. We also employ the Water Quality Analysis Simulation Program (WASP), the Environmental Fluid Dynamics Code (EFDC), and the Stream Water Quality Model (QUAL2K) for hydrodynamic and water quality models.

Our practitioners are at the forefront of policy analyses, regulatory compliance, and technology applications that promote sustainable water resources management and ecosystem restoration. We have extensive experience helping local governments develop and negotiate long-term control plans for combined sewer overflows, National Pollutant Discharge Elimination System (NPDES) permits, and consent orders. We also comment on Clean Water Act issues at the state and national level, including the development of new recreational use criteria for water bodies across the county and for the U.S. Environmental Protection Agency's new framework for integrated planning for wastewater and stormwater.

Lead Consultants

  • Lisa Austin, P.E.

    Lisa Austin is a Principal Engineer based in California with more than 25 years of experience focused on water quality and stormwater management. Lisa's practice focuses on National Polluta ...
  • David Bonnett, P.E., P.Eng.

    David Bonnett is a Principal Engineer based in Massachusetts with 30 years of experience focused on water and natural resources engineering and waste containment facility planning and design, inclu ...
  • Mark Hanna, Ph.D., P.E., LEED AP

    Mark Hanna is a Senior Principal Water Resources Engineer based in California with over 20 years of experience focused on water resources management. His experience in water rights, integrated wate ...
  • Poppy Staub

    Margaret "Poppy" Staub is a Senior Principal Geologist and Environmental Engineer based in Colorado with more than 20 years of experience focused on environmental compliance, Superfund site managem ...
  • Keith Tolson, Ph.D.

    Keith Tolson is a Senior Principal Environmental Scientist with more than 15 years of experience focused on environmental sciences. He Specializes in the application of risk-based principles to sup ...
  • Eric Strecker, P.E., BCEE

    Eric Strecker is a Senior Principal Water Resources Engineer based in Oregon with more than 30 years of experience focused on the design, monitoring, and evaluation of stormwater best management pr ...
  • Kim Williams, P.E., CPSWQ

    Kim Williams is a Senior Consultant Water Resources Engineer based in California with more than 20 years of experience focused on civil and environmental engineering. Specializing in stormw ...
  • Adrienne Nemura, P.E., BCEE

    Adrienne Nemura is a Senior Principal Water Resources Engineer based in Michigan with more than 30 years of experience focused on helping clients identify cost-effective and sustainable solutions t ...
  • Michael Lodato, P.G.

    Michael Lodato is a Principal Geologist based in Florida with more than 25 years of experience focused on the field of hydrogeology, site assessment, and remediation using innovative technologies. ...
  • Mark Ellard, P.E., CFM, D.WRE

    Mark Ellard is a Senior Principal Water Resources and Environmental Engineer based in Florida with more than 20 years of experience in diverse watershed management, water quality assessment, and st ...
  • Ganesh Krishnan, P.E., D.WRE

    Ganesh Krishnan is a Senior Principal Engineer based in Georgia with more than 20 years of experience focused on water resources and geoenvironmental engineering. Ganesh specializes in design engin ...
  • Brandon Steets, P.E.

    Brandon Steets is a Senior Principal Water Resources Engineer based in California with more than 16 years of experience focused on helping clients develop cost-effective solutions to their complex ...
  • Kathleen Harrison, P.G. QSP, QSD, QISP, ToR

    Kathleen Harrison is a Principal Geologist based in California with more than 20 years of experience focused on watershed management, stormwater pollution prevention, and erosion control. She is a ...
  • Robert Hartzel, CLM, CPESC

    Robert Hartzel is a Principal Water Resources Scientist based in Massachusetts with more than 20 years of experience focused on leading water resources restoration, watershed planning, and environm ...
  • Ken Susilo, P.E., CPSWQ

    Ken Susilo is a Senior Principal Water Resources Engineer based in California with more than 20 years of experience focused on urban stormwater management. Ken specializes in the development of mul ...
  • Tom Fendley, P.E.

    Tom Fendley is a Principal Environmental Engineer based in Georgia with more than 30 years of experience focused on civil/infrastructure design, construction engineering and contract administration ...
  • Philip Reidy, P.E.

    Phil Reidy is a Principal Water and Natural Resources Engineer based in Kuala Lumpur with over 25 years of experience focused on geotechnical and stormwater management. He has specialized experienc ...
  • Marc Leisenring, P.E.

    Marc Leisenring is a Principal Water Resources Engineer based in Oregon with more than 15 years of experience focused on stormwater master planning, watershed and storm system modeling, environment ...
  • Scott Struck, Ph.D.

    Scott Struck is a Principal based in Colorado with more than 15 years of experience focused on planning, design, and implementation of stormwater infrastructure and watershed management to meet dra ...
Geosyntec Consultants
Geosyntec is a specialized consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural resources, and civil infrastructure.

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