Stormwater Management Services


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.

Community Rating System (CRS)

CRS 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, verification, 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

LAN Matt Manges
Matt Manges, PE, CFM, ENV SP
Vice President, Practice Leader
LAN Janine Ellington
Janine Ellington, CFM
CRS/Floodplain Programs Manager
LAN Laura Casset
Laura Casset, PE, CFM, CPESC
Associate, Regional Stormwater Manager
LAN Yu Chun Su
Senior Associate, Technical Director, Environmental & Water Resources Engineering
Example Projects