David Ashfield

David Ashfield
David Ashfield, P.Eng.
Senior Advisor

David’s expertise is characterized by his record of successfully resolving conflicting mandates, often through the application of nontraditional and innovative solutions, and the provision of advisory services to ensure effective collaboration.

David has extensive experience in water resource management, municipal engineering, and land development. He has experience managing multidisciplinary teams to complete master environmental servicing plans, master drainage plans, and subwatershed planning studies throughout southern Ontario.

David is an active committee member in the Sustainable Technologies Evaluation Program (STEP), a multi-agency program led by the Toronto and Region Conservation Authority (TRCA) to provide the data and analytical tools necessary to support broader implementation of sustainable stormwater technologies and practices within a Canadian context.


Professional affiliations:

  • Professional Engineers of Ontario
  • Ontario Society of Professional Engineers
  • Canadian Water Resources Association

Areas of expertise:

  • Stormwater Management

Publications and presentations:

  • Water Balance Review and Stream Flow Analysis - A Review of Policy Direction and Stream Data Trends in the Greater Toronto Area
  • Co-Author. “Technical Bureau Supplement.” Water News (Newsletter of the Canadian Water Resources Association), September 2009
  • “Low Impact Development Stormwater Management for the North Humber Extension Neighbourhood”, Case Study Presentation
  • “Stormwater Management Strategies for the North Humber Extension Neighbourhood”, Case Study Presentation, Phase 1 Workshop
  • “ Low Impact Development Stormwater Management” for the North Humber Extension Neighbourhood
  • “Stormwater Management Strategies for Uncontrolled Urban Areas in the Lake Simcoe Watershed”, Case Study Presentation, Phase 1 Workshop, September 2009
  • “Achieving a Successful Natural Channel Design in an Urban Setting – Kolb Creek and Henry Sturm Watercourse”
  • Proceedings of the Natural Channel Design Conference, Niagara Falls, 1994
  • Criteria for Identifying Stream Flow Stations Applicable to Climate Trend Studies - Using Hydrometric Data to Detect and Monitor Climate Change Proceedings of National Hydrology Research Institute, Workshop 8, Saskatoon, April 1992
  • Integrating Data Management and Statistical Analysis for Peak Flow Estimation Co-Author, International Floodplain Management Conference, Toronto, 1990
  • Regional Analysis of Low Flow Characteristics for Central and Southeastern Regions Co-Author, Proceedings of Environmental Research Technical Conference, Ontario, November 1990