Erickson Creek Integrated Stormwater Management Plan

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Erickson CreekIntegrated Stormwater Management
Plan

• Public Open House
• October 27, 2008
• East Kensington Elementary

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Integrated Stormwater Management Plan (ISMP)

• What is it?
• Ecological approach to manage watershed
  development and treat Stormwater as a Resource.
  It includes
• stormwater design (culverts, pipes etc.)
• flood protection and public safety
• erosion and sedimentation control
• environmental protection/enhancement
• Why do it?
• To provide direction for future land use plans
  and to identify infrastructure needs.
• Required by the GVRDs Liquid Waste Management
  Plan.

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Project Team

• City of Surrey
• Rémi Dubé Drainage Planning Manager
• Jane Umpleby Project Manager
• Lynn Guilbault Planner, Long Range Planning
• Carrie Baron Drainage Environment Manager
• Parks, Eng. operations, Transportation
• Consultants
• Associated Engineering (BC) Ltd. (Michael
  MacLatchy, John van der Eerden)
• Jacques Whitford Ltd. (Karen Munro, Trevor
  Crozier)

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Stakeholders (Partial)

• Semiahmoo Fish Game Club
• Little Campbell Watershed Society
• Friends of Semiahmoo Bay Society
• A Rocha Canada
• Surrey Dyking District
• Surreys Agricultural Advisory Committee

• Surreys Environmental Advisory Committee
• Ministry of Environment
• Ministry of Agriculture, Fisheries and Foods
• Fisheries and Oceans Canada
• Nicomekl Enhancement Society
• Sunnyside Acres Heritage Society

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1st Public Open House

• Gathered input from local residents, user groups,
  and stakeholders.
• All comments and opinions received were
  considered during the development of the ISMP.

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Watershed Plan
Campbell Hts.
N
Erickson P/S
Grandview Hts.
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Erickson Creek Watershed (1)

• Existing land uses in upland areas vary
• residential
• industrial
• undeveloped
• Two distinct upland areas in terms of future
  development and underlying soils
• Grandview Heights
• Campbell Heights

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Erickson Creek Watershed (2)

• The lowland area is primarily agricultural
• Drains northward to the Nicomekl River by a
  series of interconnected drainage ditches
• Outlets via fish friendly P/S and floodboxes

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Hydraulic Inventory

• Concentrated mainly in upland reaches
• Over 200 Points of Interest
• driveway culverts
• road culverts
• ditches/side channels
• drainage problems erosion sites channel
  obstructions etc.

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Ditches/Watercourses
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Culverts
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Upland Creek Channel
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Erosion
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Environmental Assessment

• Fish habitat
• Wildlife habitat
• Water quality
• Watershed health
• Hydrogeology

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Fish in Erickson Creek

• Coho, cutthroat, trout, rainbow trout

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Habitat Productivity

• Moderate salmonid productivity
• Good rearing habitat (limited by lack of deep
  pools and riffles in some areas)
• Lack of adequate spawning gravels
• Some migration barriers
• Limited Habitat in Lower watershed agricultural
  ditches
• (high temp, low D.O., lack of complexity, etc.)

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Vandrische Brook Rearing and spawning habitat
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Stream Classification

• Most tributaries in the watershed are
• CLASS A
• inhabited by salmonids year round or potentially
  inhabited year round
• CLASS A(O)
• inhabited by salmonids primarily during the
  over-wintering period

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Stream Classification Map
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Wildlife Habitat

• Habitat available or potentially available for 8
  species of interest
• There are still many small patches of natural
  habitat
• Limited suitability for large mammals
• Most of the land is privately owned
• Well-vegetated streamside areas provide good
  wildlife habitat

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Mixed deciduous-coniferous forest in residential
area
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Grandview Heights- Development Conditions

• Existing
• Large rural residential lots
• Wooded areas, open fields
• Future
• Mostly urban residential, some commercial
• Includes greenspace, buffer strips and
  institutions

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Campbell Heights - Development Conditions

• Existing
• Majority of open fields, storage yards, and
  gravel pits
• Limited extent of green houses, processing plants
  etc.
• Future
• Large industrial and commercial properties
• Some buffer strips and landscaping

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Watershed Health

• Measured by
• percentage of intact Riparian corridor
• total impervious area (hard surface coverage)

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Watershed Health
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Potential Impacts Without Mitigation

• Increased peak flows and storm volumes from both
  Grandview and Campbell Hgts.
• Increased channel erosion
• Potential impact to lowland drainage
• Decreased base flows
• Impacts to fish habitat/survivability

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Sample Hydrograph
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Potential for Infiltration

• Limited opportunities in Grandview Heights fine
  grained soils
• Good opportunities in Campbell Heights gravels
  sands
• Lowlands have shallow water tables and lower
  hydraulic conductivity (poorly draining soils)

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Erickson Creek ISMP - Overview

• Distinct Strategies for Campbell Heights and
  Grandview Heights
• Campbell Heights largely source control
  (Infiltration based)
• Grandview Heights includes detention and limits
  on impervious (hard surface) coverage

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Campbell Heights SWM Strategy

• Primarily built on infiltration based approaches
• Underground infiltration chambers
• Perforated pipes for road drainage
• Vegetated buffer strips
• Stormwater quality Sediment interception and
  oil/water separators needed to protect
  infiltration systems

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Grandview Heights SWM Strategy (1)

• Primarily built on conventional BMPs
• 8 detention ponds wet or dry
• Potentially, wetlands at lower end of system for
  water quality
• Application of Low Impact Development (LID)
• Soil infiltration capacity is limited
• Limit TIA by retaining forest/vegetative cover

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Grandview Heights SWM Strategy (2)

• Limit impervious area coverage to protect
  watershed health.
• On both a watershed and sub-catchment scale
• Secure green space within the Grandview Heights
  area.
• Emphasis on preserving forested areas.

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Management Strategies - Summary

• Grandview Heights
• Combination of LID and 8 Detention Facilities
• Campbell Heights
• Heavily dependent on LID to
• reduce volume and peak flow (5-year RP)
• maintain base flows

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Environmental Recommendations (1)

• Protect existing forest cover
• Establish park and natural area network
• Maintain wildlife corridors
• Provide adequate riparian corridors

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Environmental Recommendations (2)

• Enhance fish habitat
• Mitigate existing problems
• Protect key amphibian habitat
• Periodic Environmental Monitoring and Field
  Reconnaissance

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• Questions?