Public Information Centre No.2 Study Area

Transcription

07/12/2015
Public Information Centre No.2
Idlewood Creek
Fairway Road to Outlet at Grand River
December 8, 2015
Study Area
• The Idlewood Creek
subwatershed has a drainage
area of approximately 462 ha
to the outlet at the Grand
River.
• The subwatershed is
considered to be fully
developed with residential,
institutional, open space land
uses and some commercial
land uses.
• The creek has been
straightened or modified over
time at various locations.
• There is a City-owned dam
and private dam downstream
of Fairway Road North.
Watershed Boundary
Study Area
Idlewood Creek (Fairway Road to Outlet at Grand River)
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07/12/2015
Study Purpose
• The City of Kitchener has initiated this Class Environmental
Assessment to address long term sedimentation and erosion issues in
Idlewood Creek, as well as to investigate whether there are any
problems associated with two online dams and to ultimately develop
recommendations to address the many issues identified.
Municipal Class EA Process
• The study will follow the
requirements for a
Schedule B project under
the Municipal Class
Environmental Assessment
(October 2000, as
amended 2007 & 2011).
• This study will complete
Phase 1 and 2 the EA
process.
Phase 1
Identify
and Describe
the Problem(s)
Phase 3
Alternative Design
Concepts
For the Preferred
Solution
Phase 2
Alternative
Planning
Solutions
• Identify alternative
designs to implement
the preferred solution.
• Inventory natural,
social/cultural and
economic
environments.
• Identify the impact of
the alternative designs
after mitigation.
• Evaluate alternative
designs.
• Identify a preferred
design.
• Identify reasonable
alternative planning
solutions.
• Evaluate the
alternative solutions,
taking into
consideration
environmental and
technical factors.
• Identify a preferred
solution to the
problem(s).
Agency and
Stakeholder
Consultation
Agency and
Stakeholder
Consultation
Problem Statement
Preferred Solution
Phase 4
Environmental
Study Report
• Compile an
Environmental Study
Report (ESR).
• Place ESR on public
record for review for
30 days.
• Notify the public and
government agencies
of completion of the
ESR and of the Part II
Order provision in the
EA Act.
Phase 5
Implementation
• Proceed to
construction of the
project.
• Monitor environmental
provisions and
commitments.
ESR
Preferred Design
We Are Here
Photographic Inventory
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07/12/2015
Previous Consultation
• The first PIC was held on November 14, 2014.
• The major issues identified at PIC No.1 were:
Moderate to significant erosion upstream of the privately owned dam;
Sedimentation of both the private and City owned dams;
Instability of the City owned dam, and
Lack of fish passage.
• Since the PIC No.1, the City has been working with the landowners and agency
stakeholders to identify alternative solutions to address the identified issues.
Public Feedback
• Reduce or eliminate impact to private properties.
• Concerned about impact of existing development on creek erosion and dam (public and
private) sedimentation.
• Minimize tree removal along the creek.
• Rehabilitate/restore creek using natural techniques.
Baseline Inventory
Hydrology (Rain – Runoff)
• The update to the Idlewood Creek Watershed hydrology model (from Master Drainage Plan)
resulted in small changes to flow rates that were used to determine creek impacts such as
erosion.
Hydraulics (Movement
of Water)
• Flood limits (floodplain) for the
100 year storm and Regional
Storm (Hurricane Hazel) have
been mapped.
• All crossings and the two dams
are overtopped by frequent
storm events, apart from the
Fairway Road crossings.
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07/12/2015
Baseline Inventory
Stream Morphology (Creek Characteristics)
• The City owned online pond has in the last two years been partially emptied resulting in a
central channel and vegetation growth within the pond.
• An upper creek reach (Reach 6) has significant channel erosion which has resulted in the
partial filling of the pond upstream of the privately owned dam.
Terrestrial Ecology
• The Idlewood Swamp Provincially Significant Wetland is
located in the study area.
• Several wetlands in the study area provide amphibian
breeding habitat.
• 4 frog species, 3 turtle species, and 50 bird species were
identified.
Aquatic Ecology
• 6 fish species were captured during the electrofishing of the creek including fathead
minnow, brook stickleback, common white sucker, creek chub, blacknose dace, and
bullhead.
• Background information and previous studies have identified Idlewood Creek as coolwater
habitat.
Baseline Inventory
Trails
• The sections of Walter Bean Trail and Community
Trail within the Study Area are owned and
maintained by the City of Kitchener.
• The Woodland Hiking Trail was created by the
Grand Valley Trail Association (GVTA) and
provides a local link between the Walter Bean
Trail and Edgewater Crescent. Wayfinding
signage along the GVTA trail is created and
maintained by the GVTA
• The GVTA pedestrian does not meet bridge code.
Walter Bean Grand River Trail (Maintained by the City)
Community Trail (Maintained by the City)
Woodland Hiking Trail (GVTA Trail ) (Maintained by the GVTA)
Creek Crossing
Dams
• The City owned dam is an earth dam with a concrete top structure and a concrete culvert
to convey flow. The dam is in reasonable condition although scouring and sink holes in the
earth embankment give cause for instability.
• The privately-owned dam is a concrete dam structure with a single outlet draining onto a
concrete spillway. The dam is in good overall condition although the dam wall has scour
damage at its base in need of repair.
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07/12/2015
Problem Statement
Erosion
• Idlewood Creek is unstable in certain reaches with moderate to significant bank erosion
within Reach 6 upstream of the privately-owned dam as well as downstream of Fairway
Road North.
Sedimentation
• Sedimentation within the pond upstream of the private dam has been and is occurring due
to upstream creek erosion, resulting from historical agriculture practices, natural erosion
.
processes
and development.
• The pond upstream of the City-owned dam is also experiencing sedimentation and has
scoured on the sides of the control structure and is at risk from not being stable.
Fish Passage
• The gabion lined channel at the confluence with the Grand River and the structures
downstream of Fairway Road North are preventing fish passage
Opportunities
Localized site specific channel improvements can improve erosion conditions downstream of
Fairway Road North and physical structures can be removed (to the extent possible) to restore the
creek to pre-alteration/ pre-development conditions facilitating fish passage. The flow regime can
potentially be positively modified through stormwater management retrofits.
Long-list of Alternatives
The following alternatives have been identified to address the problem
associated with erosion and sedimentation:
A - Do Nothing
B - Stormwater Management Retrofits
1. End-of-pipe and/or Storm Sewer Outlet Retrofits
2. Source Controls (LID)
C - Flow Diversions (local)
D - Creek Rehabilitation
1. Realignment
2. Protect in Place – Localized Protection
3. Dam Removal (City/Private)
4. Dam Alteration (City/Private)
E - Sedimentation Management
1. In-Stream Debris Systems
2. Maintenance
F – Property Access
G - Combinations
In addition to the long-list of
mitigation measures a Public
Education program should be
considered to educate
landowners adjacent to the valley
about the impacts related to
dumping in the valley, planting
invasive species, and installing
drains that outlet to the valley
slope.
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07/12/2015
Alternative A: “Do Nothing”
No measures are proposed. Represents baseline conditions
(core requirement of the Municipal Class EA process).
Alternative B: Stormwater Management Retrofits
Alternative B1: End-of-Pipe and/or Storm Sewer
Outlet Retrofits
Stormwater management facility retrofits and storm
sewer outlet retrofits could assist with erosion control.
Alternative B2: Stormwater Management Best
Management Practices (BMPs)
Stormwater management BMPs on both private and
publicly owned property, could reduce peak flows and
volume of runoff to the creek.
Alternative C: Flow Diversions
Can be implemented to address erosion problems by
transferring runoff to a neighbouring subcatchment with
capacity, reducing peak flows and runoff volume to the
creek.
Alternative D: Creek Rehabilitation
Alternative D1: Realignment
Natural channel design techniques to establish a
new alignment, cross-section and creek profile;
realignment would occur along the whole length of
the creek.
Alternative D2: Protect In-Place
A combination of stone, manufactured
bioengineering products and vegetation-based
protection to stabilize and protect the creek banks
where undercutting and excessively steep banks
are forming.
Before and After Filsinger Creek, City of
Kitchener
Alternative D3: Dam Removal (City/Private)
Dam removal to re-establish natural continuity in
the channel; additional work to address the grade
drop at the outlets.
Alternative D4: Dam Alteration (City/Private)
Dam alteration could take many forms from
reinforcement to maintaining existing conditions to
lower water levels.
With and Without Dam
Chiligo Creek, Speed River
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07/12/2015
Alternative E: Sedimentation Management
Alternative E1: In-Stream Debris Systems
Systems designed to focus the capture of
debris and sediment in designated locations
for follow-up mechanical maintenance.
Alternative E2: Maintenance
Regular inspection and maintenance
program to address the ongoing
sedimentation problem.
Alternative F: Property Acquisition
Property acquisition of at risk locations or
areas where public infrastructure is
required. Allows City to obtain land rights.
Preliminary Evaluation Criteria
Evaluation Category
Functional (Physical)
Environment
Natural Environment
Evaluation Criteria
Stability of Dam Structures
Stream Stability Related to Stream
Barriers
Artificial barriers in the Idlewood Creek negatively influence the creek’s stability.
Creek Erosion (Site Specific)
Extent of site specific erosion on creek bed and banks addressed by alternative.
Constructability
Construction and maintenance access may or may not be possible, due to private property, grading constraints and
prohibitive temporary/permanent environmental impacts. Constructability requires property rights.
Aquatic Environment
(Impacts/Enhancements)
Existing barriers reduce the ability for fish to freely move upstream limiting available habitat range and reducing diversity.
Wetlands/ Marsh
Terrestrial Environment
Amount of cultural and forest vegetation communities affected by alternatives.
Water quality enhancements resulting from stormwater management measures and/or removal of contaminated
sediment.
Sediment Accumulation
The volume of sediment removed or contributed to the public and private dams.
Impacts Archeological Resources
Economic/Financial
Amount of wetlands and marsh vegetation communities affected by alternatives.
Water Quality
Groundwater Resources
Social/Cultural Environment
Criteria Description/Comment
Dam instability and potential for failure can have negative impacts downstream of a dam including creek erosion and
property damage due to flooding.
The potential to improve groundwater through improved recharge (i.e. source control and/or storm sewer retrofits and
stormwater controls).
Amount and extend of disturbance to archaeological resources within the study area.
Impacts on Private Properties
Impacts to private lands or private property owners (access, flooding, erosion, sedimentation and vegetation removal)
based on each alternative.
Impact on Public Lands
Impacts to public lands (access, flooding, erosion, sedimentation and vegetation removal) based on each alternative.
Impact to Trail Uses
Extent of impact to trails and trail users.
Public Safety
Public safety around water is impacted by presence of dams, resulting depth and velocity of water.
Capital Costs
Construction cost of alternatives.
Operations and Maintenances
Costs to operate and maintain.
Risk
Failure of dam, trail bridges or other structures can result in damages to persons or property.
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07/12/2015
Preliminary Assessment of Alternatives
Evaluation Category
Alternative B1
End-of-Pipe/
Pond Retrofits
Alternative B2
Source
Controls
(LID)
Alternative C
Flow
Diversions
Alternative D1
Realignment
7
6
4
6
5
4
1, 2
3, 3
10
7
8
9
5
2
9
7
6
1, 3
4, 5
8
8
9
4
3
1
5
7
6
2, 4
3, 4
4
4
3
7
2
7
4
3
2, 3
6, 6
6
2
8
12
8
13
Alternative A
Do-Nothing
Alternative D3 Alternative D4 Alternative E1
Alternative D2
Alternative E2
Dam Removal Dam Alteration
In-stream
Protect in
Maintenance
Public/Private Public/Private
Debris
Place
(D3-1,D3-2)
(D4-1,D4-2)
Systems
Alternative F
Property
Acquisition
Functional (Physical) Environment
CATEGORY RANKING
Natural Environment
CATEGORY RANKING
Social/Cultural Environment
CATEGORY RANKING
Economic/Financial Environment
CATEOGORY RANKING
1
OVERALL RANKING
7
9
3
11
10
6
1, 2
4, 5
Screened
ShortListed
ShortListed
ShortListed
ShortListed
ShortListed
ShortListed
ShortListed
Screened
Screened
Screened
as
Standalone
Short-Listed Alternatives
• Based on the assessment of the Long-list of Alternatives the following have been
shortlisted as possible solutions to address the problem statement:
•
•
•
•
•
•
Alternative B1: Stormwater Management Facility and/or Storm Sewer Outlet
Retrofits
Alternative B2: Source Controls (LID)
Alternative C: Flow Diversions
Alternative D1: Creek Rehabilitation – Realignment
Alternative D2: Creek Rehabilitation – Protect In-Place
Alternative D3: Creek Rehabilitation – Dam Removal (D3–1 City, D3-2 Private)
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07/12/2015
City Dam and Culvert
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07/12/2015
Private Dam
Protect-in-place erosion sites in Reach 6 (Alternative D2). Local creek
protection upstream and downstream of the GVTA bridge.
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07/12/2015
Preliminary Preferred Alternatives
Based on the assessment of the Short-Listed Alternatives the following are the
preliminary preferred alternatives that have been advanced by the project team:
Alternative B2: Source Controls (LID)
• Lot level controls to reduce drainage to Idlewood Creek
Alternative D1: Creek Rehabilitation – Realignment
• Short restoration natural channel design required for removal of the old Woolner Road
Crossing
Alternative D2: Creek Rehabilitation – Protect In-Place
• Promote local creek stability by either removing Grand Valley Trail Association
pedestrian bridge or conducting local creek banks restoration
Alternative D3-1: Creek Rehabilitation – City Dam Removal
• Decommission of City of Kitchener Dam location and provide stable realigned channel
that facilitates fish passage
• The City of Kitchener dam removal includes a 60 m long bypass channel around a
preserved wetland function within the existing backwater pool, with appropriate flow
splitting and restoration elements
Preliminary Preferred Alternatives
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07/12/2015
Future Considerations
Alternative D3-2: Private Dam Removal
• Due to private property ownership of the dam and creek at the outlet of Idlewood
Creek, the City does not have land rights (e.g. easement or ownership) for both the
creek and the dam.
• The City of Kitchener would consider the private dam removal and creek
realignment should the City of Kitchener be granted or acquire land rights to the
area of the dam and creek.
• Municipal land rights over the dam and the creek would permit the City to remove
the dam, realign the creek and maintain it in perpetuity.
Next Steps
•
•
•
Receive public comments by January 5, 2016;
Finalize the design based on comments received by the Public and Agencies;
File the Project File for a 30-day review in early 2016.
How to Provide Comments
Complete a comment sheet
By Mail:
By Phone:
By Fax:
By Email:
Melissa Ryan, M.Sc., P. Eng.
Design and Construction Project Manager
City of Kitchener
Engineering Services
200 King Street West, P.O. Box 1118
Kitchener, Ontario N2G 4G7
Tel.: (519) 741-2200 ext. 7827
TTY: 1-866-969-9994
Fax: (519) 741-2230
E-mail: Melissa.ryan@kitchener.ca
Ron Scheckenberger, M.Eng., P.Eng.
Consultant Project Manager
Amec Foster Wheeler
3215 North Service Road, P.O. Box 220
Burlington ON L7N 3G2
Tel.: (905) 335-2353
Toll Free: 1-866-751-2353
Fax: (905) 335-1414
E-mail:ron.scheckenberger@amecfw.com
Please submit comments no later than
January 5 , 2016
Thank you for your participation!
12

Public Information Centre No.2 Study Area

Transcription

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