Stormwater
MGS offers stormwater management services including:

  • Comprehensive stormwater management planning
  • Hydrologic and hydraulic modeling
  • Design of regional stormwater detention ponds
  • Development of Stormwater Treatment Manuals
  • Design of water quality facilities including wetlands, bioswales, sand filters and alternative devices


Project Examples
Hydrologic and Hydraulic Analysis of Hylebos Creek for the WSDOT I-5/SR-167 Project
MGS performed hydrologic and hydraulic analysis of approximately 3 miles of Lower Hylebos Creek in the Puyallup Valley to evaluate existing flooding characteristics/floodplain limits as well as those associated with creek mitigation/restoration alternatives for the proposed extension of the I-5 HOV lanes and the SR-167/509 highway corridor.  MGS Engineering Consultants was the prime consultant and analyzed watershed hydrology using the HSPF model.  Subconsultants provided analyses in the areas of hydraulics/floodplains, fluvial processes, and GIS.  The project proposal includes the restoration of the riparian corridor as the centerpiece in lieu of constructing large stormwater detention ponds.

McElroy Slough Hydrologic and Hydraulic Analysis, Skagit County Public Works

Performed continuous-flow (HSPF) hydrologic analysis of Colony and Whitehall Creeks located in northwestern Skagit County and developed a hydraulic estuary model of McElroy slough located at the outlet of the streams.  The analysis was performed to examine the effects of potential land use changes on watershed runoff and to quantify the tidal flushing and flood reduction benefits of replacing existing flap gates with self regulating tide gates.