Stormwater Management2018-05-31T20:27:45+00:00


  • FEMA / Floodplain Studies

  • GIS Mapping

  • Hydraulic & Hydrologic Analysis

  • Stormwater Management (BMPs)

  • Erosion & Sediment Control

  • NPDES Permitting & Regulatory Compliance

  • Bridge Scour Analyses

  • Natural Channel Design & Streambank Stabilization

  • Construction Management & Inspection

Stormwater Management

Stormwater Management is of much greater concern to local governments today than it was just 20 years ago.  The public interest is two-fold: prevent pollutants from entering streams and other bodies of water, and reduce the risk of potential flooding.  This specialty of civil engineering requires precise calculation in order to plan first for the collection of rainwater from roofs, parking lots and other impervious surfaces, and to then channel that flow into a facility designed to either detain or retain the storm water, thereby averting upstream or downstream flooding.

At TWM, we have designed storm sewer systems for both new projects and reconstructions. Our engineers have experience designing regional storm water basins to effectively manage watersheds, have assisted municipal clients in the planning and implementation of annual inspection and maintenance programs, have re-designed systems that were undersized by others and causing localized flooding, and have provided expert witness testimony in cases where the causes of a flood were called into question.  Staff experience extends beyond the design phase to also include erosion control solutions, stormwater pollution prevention plans and best management practices.  In addition, TWM can perform dam inspections, flood plain studies, bridge hydraulic analysis reports, and scour analysis.

Our past experience and resulting expertise make us a valued partner in developing solutions to our clients’ water resources challenges.

Learn more about our Water Infrastructure and Lake and Dam services.


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Exceptional Service. Nothing Less.


TWM continues the important business of supporting our nation’s essential infrastructure in these uncertain times. We are committed to our mission of providing Exceptional Service, Nothing Less to you, our clients and partners. As a professional services firm, the health of our employee-owners and their families is paramount. We are following government directives and public health guidance, implementing work-from-home and other social distancing and hand hygiene practices. We have employed additional technological resources to support our modified operating structure, and we expect to be able to do so with minimal disruption. If you need to visit our offices in person or have trouble reaching your TWM contact, please contact us at 618.624.4488 so we can make arrangements or put you in touch with the appropriate person. Thank you for placing your trust in TWM. Wishing you safety and good health.