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Integrated Stormwater Management Plans

ENG-ISMP

In BC, the term Integrated Stormwater Management Planning (ISMP) has gained widespread acceptance by local governments and environmental agencies to describe a comprehensive, ecosystem-based approach to rainwater management.

The purpose of an ISMP is to provide direction for future development plans and identify infrastructure needs. The goal is to balance:

  • Land use planning
  • Stormwater engineering
  • Flood and erosion protection
  • Environmental protection

In the past, stormwater management planning had a primary function to identify the infrastructure needed to service increased development. The impacts of development were given little consideration.

Today’s stormwater management planning has evolved significantly to become a comprehensive approach to also include the preservation and utilization of resources within a watershed. An ISMP is intended to balance the land use needs with the natural values and functions of the watershed.

Traditional stormwater management planning involves:

  • Drainage Systems
  • Reacting to Problems
  • Engineer-Driven
  • Protecting Property
  • Pipe and Convey
  • Unilateral Decisions
  • Local Government Ownership
  • Extreme Storm Focus
  • Peak Flow Thinking

Integrated stormwater management planning involves:

  • Ecosystems
  • Preventing Problems
  • Interdisciplinary Team-Driven
  • Protect Property & Habitat
  • Mimicking Natural Processes
  • Consensus-Based Decisions
  • Partnerships with Others
  • Rainwater Integrated with Land Use
  • Volume-Based Thinking

ISMP Map

Please see the ISMP Map for an overview of the City’s ISMP watersheds.

In Development ISMPs

  • Sam Hill Creek

Completed ISMPs

Full PDF reports of each completed ISMP are provided below. Please note that the following files are print quality and are therefore a larger file size.

Contact EngWebmail@surrey.ca or 604-591-4340 if you would like more information on any of the ISMP projects.

Drainage Plans

Drainage plans provide information on managing stormwater. They are an integral part of both large watershed-level planning studies as well as for individual developments by detailing the storm servicing requirements. Drainage plans can be part of a drainage report, a stand-alone figure or a combination of both.

Drainage Reports

Drainage reports address the condition of the existing drainage system. They list recommendations on a specific local drainage issue or can address large areas providing information on general catchment opportunities and constraints. They recommend solutions for specific issues or addressing larger concerns and are used to plan for future development.

Drainage reports present the results of investigations into issues that affect the drainage system and its various components. The reports compile information on many related factors providing conclusions and recommendations to effectively manage the drainage system.

Drainage reports, depending on the reports objectives, can provide information on one or more of the following:

  • Overall catchment area
  • Drainage sub catchment areas
  • Catchment characteristics (such as land use, rainfall patterns, groundwater, soils, slopes, slope stability)
  • Contaminates sites
  • Environmentally sensitive areas
  • Terrestrial Wildlife issues
  • Watercourses
  • Water quality issues
  • Erosion concerns
  • Minor flows (5-year design storm runoff)
  • Major flows (100-year design storm runoff)
  • Existing storm system infrastructure and capacity
  • Proposed storm system infrastructure and capacity

Drainage reports can include issues that extend beyond just storm water as the changes in one area affects everything else. The integration of storm water management planning requires consideration of many factors.

Where Drainage Plans and Drainage Reports Are Found

Documents where you might find drainage plans and/orreports include:

  • Integrated Storm Water Management Plans (ISMP)
  • Master Drainage Plans (MDP)
  • Functional Feasibility Plans  (FFP)
  • Area Servicing studies
  • Neighbourhood Concept Plans (NCP)
  • Development Application plans as Storm water Control Plans
  • Preliminary Design assessments
  • Reports commissioned for specific infrastructure management issues

Most Surrey drainage plans and reports are available from the City’s GIS department by contacting GIS document services.

See our Drainage Report List for a complete list of available reports.