When the water's rising, we will help keep your feet dry.

LAN offers the complete spectrum of stormwater management services, including initial planning and feasibility studies, experienced design engineering and construction support, and permitting and regulatory compliance.

2-Dimensional (2D) Modeling

2D hydrodynamic modeling has become a powerful tool to investigate areas impacted by flooding during rainfall events. By modeling historic rainfall events, 2D modeling helps accurately demonstrate rainfall depth and flow direction. Our 2D modeling specialists apply practical modeling techniques to fully understand stormwater conveyance system performance during flood events, identify the root cause of flooding problems, develop solutions on localized and regional scales, and document improvement benefits.

Water Quality Management & Modeling

With more communities experiencing substantial population growth, urbanization, and aging infrastructure, receiving water bodies are becoming increasingly polluted by urban runoff and wastewater leaks. The LAN team has developed water quality tools to quantify the cost and effectiveness of proposed water quality improvement measures. Our water quality team can work directly with communities and agencies to address existing impairments, as well as guide future watershed planning to improve sustainability and quality of life.

Thermal Modeling

Cooling water discharged from power plants and industrial facilities may have negative impacts on receiving water bodies and ecosystems. Our thermal modeling team has the tools and extensive experience to evaluate and address thermal discharge issues, as well as support the permitting process with regulatory agencies. We are knowledgeable of current and impending state and federal regulations, and can assist affected industries with technical support to meet or maintain compliance.

Municipal Separate Storm Sewer (MS4) Permitting

The Clean Water Act is the primary federal law that regulates water pollution to surface waters and requires most municipalities have an MS4 permit to regulate stormwater discharges. LAN can support a variety of compliance obligations, including:

  • Permit application
  • Storm Water Management Plan (SWMP) / Storm Water Pollution Prevention Plan (SWPPP) development
  • Best Management Practice (BMP) creation and implementation

We are knowledgeable of existing and emerging stormwater quality regulations and have a proven track record of keeping clients in compliance.

Community Rating System (CRS)

undefinedCRS is a flood insurance premium discount program for communities in the National Flood Insurance Program (NFIP) to adopt and enforce higher standards for better floodplain management. LAN provides assistance in all areas of the CRS process, including new CRS applications, reverification, program optimization, and individual activities within the CRS program.

LAN has experience with Municipal Separate Storm Sewer System (MS4) stormwater discharge permits, stormwater construction permits and industrial stormwater activities.

LAN developed a county-wide master plan covering all 2,500 miles of channel in Harris County, Texas.

Stormwater Management Leadership

Derek St. John

Derek St. John, P.E., CFM

Vice President

Business Group Director - Infrastructure Water Resources


Derek St. John has 15 years of experience and leads LAN’s stormwater management team specializing in hydrology and hydraulics (H&H) analysis and design. He has led numerous regional mitigation planning and design efforts for a variety of improvement projects, including drainage system master planning, watershed level H&H studies, flood damage reduction feasibility studies; and storm sewer, culvert, and basin design.

He has utilized advanced planning and analysis techniques (2D modeling) to identify not only system deficiencies, but the root causes. This in-depth understanding provides improvement concepts that address deficiencies and are tailored to project needs. His approach to design focuses on the cost effective construction, long term maintenance of the proposed infrastructure, and minimizing impact and disturbance to the community.

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Janine Ellington

Janine Ellington, CFM

CRS/Floodplain Programs Manager


2013 CRS Coordinator’s Manual




Janine Ellington has extensive experience assisting communities with the Community Rating System (CRS) program. Her unique skill sets include complete implementation of the program, and working with communities in Texas, Oklahoma, Arkansas, Louisiana, and New Mexico to initiate the CRS program, as well as maintain or improve CRS ratings.

As a former ISO/CRS Specialist, Janine understands how to efficiently navigate the process of joining CRS, as well as the 3-5 year re-verification process through the updated 2013 CRS Coordinator's Manual. She has a full understanding of newly available credit opportunities and obtaining credits with a community's current activities.  

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