For over 30 years Crossman Engineering has been active in the expanding role of Stormwater Management and its importance to environmental protection. Stormwater Management is recognized as a major influence on groundwater and surface water quality, groundwater recharge, water supplies, floodplain management, stream/riverbed erosion, aquatic habitat and our region’s hydrologic cycle.

As a consulting engineering firm, Crossman Engineering is active in the practical application of stormwater design and is also an active participant in the regulatory process as new stormwater design standards are developed. This role allows our team to remain abreast of practical applications, new technologies and future regulatory requirements.

Our experiences are widespread and include:

  • Hydrologic and Hydraulic Evaluations and Analysis
  • Stream and River System Crossing
  • Floodplain Analysis
  • FEMA Floodplain Map Revision
  • Stormwater Design for Highway Agencies, Municipalities and Residential/Commercial/Industrial Land Development
  • Water Quality Analysis
  • Groundwater Recharge and Mounding
  • Stormwater Planning and Layout
  • Advanced Stormwater Treatment Systems
  • Stormwater System Retrofit Design
  • Inspection and Analysis of Existing Drainage and Culvert Systems
  • Green Infrastructure and Low Impact Development Alternatives
  • Municipal Separate Storm Sewer Systems (MS4) Inspections and Technical Support
  • System Inventory Analysis, GIS Data Collection, Mapping and Illicit Connection Assessments
  • Stream/Riverbank Stabilization
  • NPDES Stormwater Permitting
  • Soil Erosion and Sedimentation Plans and Permitting
  • Construction Inspection and Post Construction Monitoring
  • Peer Reviews
  • Regulatory Permit Consulting


Subsurface Detention for Commercial Land Development

River Crossing Design

River Crossing Design