Stormwater management ponds and constructed wetlands



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INSPECTION AND MAINTENANCE GUIDE FOR
STORMWATER MANAGEMENT PONDS AND
CONSTRUCTED WETLANDS






Inspection and Maintenance Guide for
Stormwater Management Ponds and
Constructed Wetlands
2016
(revised April 2018)

Prepared by
Toronto and Region Conservation and CHM Hill Canada Ltd.
© Toronto and Region Conservation Authority



Inspection and Maintenance Guide for SWM Ponds and Constructed Wetlands
Toronto and Region Conservation Authority and CHM, 2016
i
PUBLICATION INFORMATION
This guide represents a major update and elaboration of the Stormwater Management Facility Sediment Maintenance Guide completed in 1999 by Greenland International Consultants for TRCA and the Stormwater Assessment Monitoring and Performance (SWAMP) Program. This guideline was prepared by the Toronto and Region Conservation Authority’s Sustainable Technologies Evaluation Program. Consulting support was provided by Dr. Francine Kelly-Hooper, Soils Scientist, CHM Canada Limited. Legal support was provided by Janet. L. Bobechko LLP, Certified Specialist (Environmental Law. Citation Toronto and Region Conservation Authority (TRCA) and CHM Canada. 2016. Inspection and Maintenance Guide for Stormwater Management Ponds and Constructed Wetlands. Toronto and Region Conservation Authority, Vaughan, Ontario. Documents prepared by the Sustainable Technologies Evaluation Program (STEP) are available at www.sustainabletechnologies.ca
. For more information about this or other STEP publications, please contact
Tim Van Seters
Manager, Sustainable Technologies Toronto and Region Conservation Authority
9550 Pine Valley Drive, Vaughan, Ontario LL A Tel
289-268-3902 Email tvanseters@trca.on.ca
Lisa Rocha
Project Manager, Sustainable Technologies Toronto and Region Conservation Authority
9550 Pine Valley Drive, Vaughan, Ontario LL A Tel
289-268-3914 Email lrocha@trca.on.ca


Kristina delidjakova
Acknowledgements
Table of contents
Why swmf maintenance is necessary
Ontario lakes and rivers improvement act (r.s.o. 1990)
Volume and treatment efficiency
Assumption and maintainance of stormwater management facilities
Inspection and preventive maintenance
Corrective maintenance activities
Forecasting sediment accumulation
Sediment field assessment methods
Sediment sampling methods
Sediment removal methods
Hydraulic (suction) dredging
Assessing disposal and beneficial reuse options based on sediment quality
Sediment quality analysis considerations
Appendix a: pond/wetland construction checklist appendix b
List of figures
Figure 4.1: hypothetical sediment forecasting example…………………………………………….
Figure 7.2: a sediment filter bag in use on a level, stable surface during pond draining………………
List of tables
Use of this guide
Federal fisheries act (r.s.c. 1985)
Ontario fish and wildlife conservation act (so. 1997)
Ontario water resources act (r.s.o. 1990)
Ontario environmental protection act (r.s.o. 1990)
Ontario nutrient management act (r.s.o. 2002)
Constructed wetlands
Typical design
Figure 3.2: profile view of atypical swm pond (from cwp, 2009).
Figure 3.4: constructed wetland schematic (from cwp, 2009).
Forebay pre-treatment i)
Design element
Side slopes safety i)
Protection level
Performance monitoring
Figure 3.10:
Management facilities
Implementing an inspection and maintenance program
Exhibit 4.3:
Additional observations
Figure 4.1: hypothetical sediment forecasting example.
Figure 5.1 cont’d:
Figure 5.2. restoration plantings after a swmf cleanout.
Figure 6.1: disc and rod sediment depth measurement with the help of a total survey station.
Figure 6.2: planning process and field methods for sediment sample collection.
Sediment sample
Sample delivery
Figure 7.2: a sediment filter bag in use on a level, stable surface during pond draining.
Figure 7.4: a hydraulic dredge in a stormwater management pond.
Table 7.1: the advantages and limitations of using hydraulic dredging in swmf facilities. advantages
Figure 7.5: schematic of standard cutterhead hydraulic dredge (crisafulli ® flump).
Figure 7.7: horizontal auger cutterhead dredge(lwt® pit-hog).
Figure 8.2: wet sediment being mixed with mulch to expedite drying.
Figure 8.3: the application of an sap product to wet sediment and the resulting sediment consolidation.
Based on sediment quality
Figure 9.2: graphic depiction of the proposed provincial framework for excess soil management (moecc, 2016).
Table 9.1 cont’d:
Table 9.2. urban swmf sediment quality parameters and their relevance to o.reg. 153/04 soil standards. urban swmf
Sodium adsorption
Pesticides and
Figure 10.1:
Figure 10.2:
Adapted from wmi, 1997
Ii. subgrade preparation
Stormwater pond / stormwater wetland construction inspection checklist
Iv. riser / outlet structure installation
V. embankment construction
Viii. outlet protection
Ix. vegetative stabilization
N/a = not applicable
Pond / wetland maintenance inspection form
Rationale for swmf sediment disposal and beneficial use assessment
General swmf descriptions
British columbia
Selection of sediment quality analysis lists
Soil particles
Selection of swmf sediment quality analysis list for topsoil amendment beneficial reuse
Sediment quality results
Analytes o.reg 347
Permission for routine infrastructure works
Development type
Project objectives
Challenges and lessons learned
Anionic polyacrylamide hydraulic
Water-absorbing polymer
Winter mechanical dredging of ab bstormwater pond
Site description
Categorycost
Winter mechanical dredging of ab bstormwater pond forebay
Stormwater management ponds and



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