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  • Stormwater Management Requirements - Quick Reference Guide
    in Storm Sewers Assessing Roadway Surface Flooding Assessing Flow in Stormwater Management Detention Facilities Assessing the Potential for Scour Computer Model Characteristics The grouping Applying MTO Drainage Policy contains guidance on the application of MTO drainage policy This grouping contains Elements of Common Law Common Law and the MTO Statutory Mandates of the Regulatory Agencies Statutory Mandate of MTO Design Criteria for Highway Drainage Works Legal Agreements table 1 Identifying Drainage Issues Issue Relevance to MTO Status of Land Development Proposal Preliminary or Detail Stormwater Management Report Review of the plan to either set Draft Plan or Site Plan Conditions of Approval or to approve and issue a permit for the proposed land development Conformance with the approved land use designations as per Official Plan or Secondary Plan If the land use designation must be changed to accommodate the proposed land development it is too soon in the Municipal Approval Process for MTO to conduct a review of the SWM report Drainage related Conditions of Approval i e Draft Plan or Site Plan proposals placed on the proposed land development MTO will not approve works that will contravene another agency s Conditions of Approval Conditions of Approval imposed by MTO must be addressed or adhered to Status with other regulatory agencies MTO will not approve works that will contravene another agencies authority or mandate e g MNR MOE conservation authorities Department of Fisheries and Oceans municipalities etc Previous permits issued by MTO for this proponent or for this site If MTO has approved a land development proposal in the past how does the present one differ Have any changes to the MTO drainage practice occurred since the last permit or approval was granted Previous Drainage Studies Conformance to a previous drainage study e g watershed subwatershed or master drainage plan etc What criteria and other elements are relevant to this submission and are they adhered to Was the previous drainage study endorsed by MTO Are the design objectives goals design criteria and other elements as promoted by the study acceptable to MTO Conformance to previous highway studies e g preliminary design reports MTO will not approve works that will conflict with existing or future highway works Need for Water Quality Treatment Regulatory water quality issues Has MOE MNR CA or the municipality issued requirements for water quality treatment MTO will not approve a land development proposal that will contravene the authority or mandate of these agencies Identify Fish Habitat Issues Regulatory fish habitat requirements Has MOE MNR DFO or the CA issued requirements for fish habitat that are to be addressed by the proponent MTO will not approve a land development proposal that will contravene the authority or mandate of these agencies Any proposed fish habitat mitigation work must not impact the highway drainage system Note The resolution to fish habitat issues is outside the scope of this document Refer to the MTO Regional Environmental Section or the appropriate regulatory agency Top of page table 2 Analyzing the Receiving Drainage

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section2.shtml (2014-08-11)
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  • Stormwater Management Requirements - Checklist
    Highway Drainage System bridge culvert storm sewer roadside ditch major system stormwater management facility other Right to Outlet alternative outlets into highway drainage system into receiving drainage system upstream of highway into receiving drainage system downstream of highway Future Highway Works new highway expansions rehabilitation maintenance works drainage works identified conflicts with outlet from the proposed development Criteria Regulating Receiving Drainage System highway design criteria policy of regulatory agencies MTO policy manuals and guidelines conflicts between MTO and Regulatory Agencies Known Drainage Problem Upstream or Downstream Riparian Property Lack of sufficient drainage outlet Highway Right of way flooding or overtopping of highway bridge or culvert erosion on highway right of way erosion at highway bridge or culvert silt in culvert flooding of riparian property erosion on riparian property water quality Checklist 3 Assessing Impacts to the Receiving Drainage System Download Checklist 3 for printing PDF 47K Category Items or Elements Discussed in SWM Report Applicable Documented Reference Points Upstream of proposed land development Downstream of proposed land development Upstream of highway drainage system Downstream of highway drainage system Along highway drainage system Control point Known drainage problems Parameters to be Calculated Peak Flows Water surface elevations Flow Velocities Runoff Volume Calculations Range of Frequencies to be Analyzed low flow events water quality or fisheries 2 year 5 year 10 year 25 year 50 year 100 year regulatory storm Design Storm Events type and duration rainfall records and station rainfall discretization input parameters Watershed Catchment area Data discretization and areas land use soil types vegetation cover slope and infiltration parameters CN pervious and impervious areas directly connected areas travel length slope and time to peak or time of concentration recession constants computational time step rational method runoff coefficient Capacity of Highway Drainage System Bridges and culverts allowable headwater level design flow capacity regulatory storm Storm sewer roadside ditches and major system design flow frequency freeboard requirements allowable depth of flow on highway surface regulatory storm Stormwater Management Detention Facilities design flow capacity design flow frequencies allowable storage volume and headwater level design stage storage discharge relationship freeboard requirements regulatory storm Computational Methods culvert analysis bridge analysis flow in open channels assessing channel erosion including roadside ditches flow in storm sewers roadway surface flooding flow in stormwater management detention facilities scour potential computer models Documentation of Impacts Post development to Pre Development Scenario Comparison suitability of reference points peak flow rates water surface elevations flow velocities runoff volumes Impacts increased peak flows at references points increased water surface elevations at reference points increased flow velocities at reference points capacity of highway drainage system Recommendation for Mitigative Works Level of mitigation required at references points level of peak flow reduction level of water surface elevation reduction level of erosion protection required due to flow velocities Mitigative Works Proposed Stormwater Management Controls water quality and or water quantity facilities type size location setback from highway roof top or parking lot controls device used location and layout volume controlled operation and maintenance responsibilities Modifications to

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section3.shtml (2014-08-11)
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  • Stormwater Management Requirements - MTO Approvals
    and Highway Improvement Act Permit and or Conditions of Approval Determining if a SWM Report needs to be submitted to MTO A SWM report is required with a land development proposal to support the following MTO approvals A Public Transportation and Highway Improvement Act PTHIA Permit which may be a Building and Land Use Permit or an Encroachment Permit A Building and Land Use Permit is required when a structure is to be constructed within the highway corridor control area The control area varies depending on the type of structure e g the control area for a shopping centre is 800m To determine if a Building and Land Use Permit is required contact the local MTO District Office An Encroachment Permit is generally required when any work is to be completed within the highway right of way To determine if an Encroachment Permit is required contact the local MTO District Office Conditions of Approval apply to Site Plan or Draft Plan of Subdivision proposals During the circulation process MTO may request Conditions of Approval Each condition must be cleared by MTO before the proposal is approved For clarification contact the MTO Regional Highway Planning and Design Office or the local MTO District Office To determine when a SWM report is required to support either of the above noted approvals refer to the figures presented below Figure 2 Development Proposals Outside the Jurisdiction of the PTHIA A SWM Report is required when drainage related Conditions of Approval have been requested by MTO Figure 3 Development Proposals within the Jurisdiction of the PTHIA A SWM Report is required when a Building and Land Use Permit is required and or drainage related Conditions of Approval have been requested by MTO A SWM Report is required when a Building and Land Use Permit is

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section4.shtml (2014-08-11)
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  • Stormwater Management Requirements - Identifying Drainage Issues
    in SWM Report The report should indicate all the regulatory agencies involved in the review of the land development proposal and provide an update on the status of approvals with each of the agencies Copies of documentation i e letters of approval permits etc from the various regulatory agencies involved should be appended to the proposal as they become available Relevance to MTO As an agent of the crown MTO will not provide an approval that will contravene the mandate or authority of another regulatory agency As a result MTO requires the SWM report to be approved by all regulatory agencies or an approval in principle is provided by the regulatory agency Confirmation of final approval should be forwarded to MTO MTO will review the requirements set by the regulatory agencies to ensure that MTO requirements will not conflict with those of another agency and vice versa Should the requirements of other regulatory agencies conflict with MTO requirements or vice versa a meeting may be warranted to resolve the controversial aspects of the SWM report MTO can issue an approval in principle for the SWM report if it is required by the proponent to secure clearances from other regulatory agencies MTO Permits As part of MTO s mandate under the Public Transportation and Highway Improvement certain land development proposals will require that an Encroachment Permit Building and Land Use Permit entrance permits or Signage Permit be obtained from the MTO Issuance of these permits will depend on the jurisdictional requirements i e setback distance between the proposed land development and the highway right of way for each type of permit Contact the local MTO District Office for further clarification Documentation Required in SWM Report The report should indicate which permits are required from MTO A background check on the site with the assistance of the local MTO District Office would turn up any previous permits that may have been issued in the past for the proposed land development Clarification on the validity of the previous permit and any changes to the MTO drainage practice that might affect the required permit can also be obtained All relevant issues should then be summarised in the SWM report e g partial construction of the proposed land development validity of permit expiry dates conditions of approval of the permit applicability of the previous conditions on current land development proposals and ownership of the property etc Relevance to MTO Where MTO has issued a permit the status and applicability of that permit for the proponent or the proposed land development must be determined Should approvals of other regulatory agencies conflict with MTO requirements or vice versa a meeting may be warranted to resolve the controversial aspects of the SWM report MTO can issue an approval in principle if it is required by the proponent to secure clearances from other regulatory agencies Top of page Reviewing Previous Drainage Studies The SWM report should document any previously completed drainage studies that are to be used for the proposed land development by providing documentation on the following areas Previous Drainage Studies Previous drainage studies include the following Watershed subwatershed and master drainage plans provide the goals objectives and criteria for the management of resources in a watershed subwatershed or area of specific interest Preliminary SWM reports are typically submitted at the earlier stage of design to outline all potential impacts that are caused by the proposed land development recommend mitigative works and demonstrate the feasibility of the mitigative works Detailed SWM reports are typically submitted at the detailed design stage to provide the detailed design and demonstrate adherence with all requirements that have been set Other types of drainage studies could include sources include conservation authorities MNR MOE and municipalities Flood Damage Reduction Program Studies FDRP studies erosion control studies flood control studies or combinations of the above Documentation required in SWM Report Where a previous drainage study is in existence and any objectives goals design criteria and other elements from that study are intended to be used in the proposed SWM report the report must clearly indicate if MTO formally endorsed the previous drainage study If MTO endorsed the previous drainage study documentation of relevant objectives goals design criteria and other elements of the referenced study must be included with clear references to its source This may include limits on regulatory flood flows and water levels water quality objectives fish habitat restoration or protection objectives identification of flood or erosion prone areas the type of drainage system that is required or requirements for stormwater management controls Adherence of the SWM report to the referenced drainage study must also be clearly documented When making submissions based on previously completed drainage studies changes that have occurred to MTO drainage practice must be considered i e MTO continually updates its drainage practice Other agencies also undertake these types of updates Contact the MTO Regional Highway Planning and Design Office to determine if changes have occurred to the MTO drainage practice since the previous drainage study was completed If there has been changes the proponent must demonstrate how the previously completed drainage study is in conformance with current MTO drainage practice If MTO did not endorse the previous drainage study there may be two reasons The SWM report should document which of the following reasons apply MTO may not have endorsed the previous drainage study since MTO was not on the circulation list and had not reviewed it In this case the previous drainage study should be reviewed by MTO for conformity to MTO drainage practice Should the study be acceptable to MTO an endorsement can be issued Once complete the proposed SWM report can be reviewed on the basis of conformity to the previous drainage study MTO may not have endorsed the previous drainage study because of a disagreement with certain objectives goals design criteria or other elements of the previous drainage study Determine the aspects of the previously completed drainage study that were not acceptable to MTO Once this

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section5.shtml (2014-08-11)
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  • Stormwater Management Requirements - Identifying Drainage Impacts
    conflict with the existing highway drainage system or with any future highway drainage works Where a conflict with future highway works has been identified the SWM report must document how the conflict was resolved MTO does not generally allow drainage works associated with land development proposals to be located within the highway right of way as they should be confined within the land development property boundaries however where a mutual benefit is recognized PHY Directive B014 provides guidance The MTO Regional Highway Planning and Design Office must be contacted before making such a recommendation The following sections should be reviewed Fundamental Purpose of Highway Right of way and Drainage System Drainage Works by Outside Parties Constructed within the Highway Right of way Consider a Planned Shared Use of the Highway Drainage System Legal Agreements Top of page Identifying Criteria that Regulate the Receiving Drainage System Criteria used to regulate impacts to the receiving drainage system should be documented in the SWM report Regulating criteria are presented below Highway Drainage Design Criteria The SWM report must identify the design criteria for the components of the highway drainage system i e that form part of the receiving drainage system whose capacity may be impacted by stormwater runoff discharging from the proposed land development For details on MTO drainage design criteria refer to Highway Drainage Design Standards 2008 or refer to Design Criteria for Highway Drainage Works Other highway design criteria may also be applied Contact the MTO Regional Highway Planning and Design Office for further details Where a previous drainage study has been referenced for highway drainage design criteria refer to Reviewing Previous Drainage Studies Other Drainage Design Criteria The local conservation authority and or municipality should be contacted for design criteria applicable to the component of the receiving drainage system for which they have operational and maintenance responsibilities Where a previous drainage study has been referenced for drainage design criteria related to other components of the receiving drainage system i e other than the highway drainage system refer to Reviewing Previous Drainage Studies Drainage Management Policy of Regulatory Agencies Provincial regulatory policies for drainage management include Provincial Policy Statement Natural Heritage Water Quality and Quantity Natural Hazards and Human Made Hazards Planning Act Provincial Water Quality Objectives Ontario Water Resources Act Official Plans Secondary Plans and Zoning By laws Planning Act Municipal Act and Fill Construction and Alteration of Waterway Conservation Authorities Act The above noted policies are recognised by MTO Where required by the regulatory agencies the SWM report should document compliance with these policies Drainage Management Policy of MTO Drainage management policies are issued by the MTO under the authority of the Public Transportation and Highway Improvement Act through the following directives PHY Directive B014 presents MTO drainage policy conforming to common law precedents The fundamental basis of this directive is to ensure that stormwater runoff discharging from any highway drainage works will not infringe upon the riparian rights of landowners located upstream or downstream of the highway right of way The proponent must recognise that MTO will not approve a land development proposal if the riparian rights of any landowner may be infringed upon by the proposed land development PHY Directive B63 and PHY Directive B217 MTO participation in works administered through the Drainage Act is detailed in PHY Directive B63 and MTO drainage policy for private piped drains on the highway right of way is detailed in PHY Directive B217 They should be reviewed when matters related to municipal drains or tile drainage apply to the proposed land development In such cases the SWM report must document how the procedure in either directive was followed Standards of Practice Identified through Manuals and Guidelines Manuals and guidelines are prepared to implement the design criteria and regulatory policy of a provincial agency local municipality or local conservation authority Manuals and guidelines present acceptable design applications and or computation methodologies that conform to design criteria and regulatory policy and they should be reviewed accordingly Standard manuals and guidelines that are issued by provincial agencies and are applicable to land development proposals include Drainage Management Manual MTO 1997 Highway Drainage Design Standards MTO 2008 Stormwater Management Planning and Design Manual MOE 2003 and Flood Plain Management in Ontario Technical Guidelines MNR 1987 This document does not present examples on the application of the various computational methodologies or design applications presented within the manuals listed above however references are provided where appropriate The local conservation authority and municipality should be contacted for manuals or guidelines that are applicable in their local jurisdiction Where Conflicts Exist between MTO and the Regulatory Agencies As an agent of the crown MTO will not approve a land development proposal that will contravene the design criteria drainage management policy or the guidelines and manuals of the regulatory agencies provided that the integrity of the highway drainage system is not compromised Should any design criteria drainage management policy guideline or manual of a regulatory agency conflict with a design criteria drainage management policy guideline or manual of MTO or vice versa a meeting between the parties may be warranted to resolve the conflict Top of page Identifying Existing Drainage Problems Before proceeding with an impact assessment any existing drainage problems that may be aggravated by stormwater runoff from the proposed land development must be identified Upstream or Downstream Riparian Property The SWM report should identify any existing drainage problems and associate each problem with the appropriate riparian property owner Existing drainage problems could include flooding of property erosion of the stream bed and or sediment accumulation bank slumping degraded water quality and lack of a sufficient drainage outlet Visit the site if possible to assess drainage conditions in the area Contact the local conservation authority municipality or the local MOE MNR or MTO office for information Highway Right of way The SWM report should identify any existing drainage problems associated with the highway right of way including flooding on the highway surface or highway overtopping at the bridge

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section6.shtml (2014-08-11)
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  • Stormwater Management Requirements - Checking the Capacity of the Highway Drainage System
    debris flow are not affected refer to chapter 5 of the Drainage Management Manual MTO 1997 fish passage in culverts on page 66 river ice on page 78 and debris flow on page 93 Top of page Checking the Design Capacity of the Highway Storm Sewer or Roadside Ditch Where the proposed land development will be discharging to a receiving drainage system that leads to a highway storm sewer or roadside ditch the design capacity of the existing highway storm sewer or roadside ditch must be examined The SWM report must present the following parameters calculated at the location where external stormwater runoff enters the highway storm sewer or roadside ditch using the total catchment area which must include the proposed land development area peak flow rate and the corresponding depth of flow and flow velocity calculated using the design flow frequency with the proposed land development area at pre development conditions peak flow rate and the corresponding depth of flow and flow velocity calculated using the design flow frequency with the proposed land development area at post development conditions peak flow rate and the corresponding depth of flow calculated using the regulatory storm and the proposed land development area at pre development conditions and peak flow rate and the corresponding depth of flow calculated using the regulatory storm and the proposed land development area at post development conditions The SWM report must document if the capacity of the highway storm sewer or roadside ditch will be exceeded because of stormwater runoff discharging from the proposed land development Review the following conditions and report the results in the SWM report If the capacity is exceeded the impacts should be identified in the SWM report Proceed to Identifying Impacts to the Receiving Drainage System for further details Where the pre development peak flow calculated in a is less than or equal to the design flow capacity the capacity of the highway storm sewer or roadside ditch is not exceeded if the post development peak flow rate calculated in b is less than the design flow capacity and freeboard requirements for the highway roadside ditch only are satisfied and the post development depth of flow calculated in b and d is less than the allowable depth of flow and the post development flow velocity calculated in b does not cause erosion or scour If a highway storm sewer or roadside ditch has excess capacity that is to be used to accommodate stormwater runoff from the proposed land development the portion of the excess flow capacity allocated to the proposed land development must be presented in the SWM report A means of calculating capacity allocation can be done using the following relationship proposed land development area x excess flow capacity tributary area Such an allocation of excess flow capacity will not be approved by MTO if the excess flow capacity is required for future highway works Where the pre development peak flow calculated in a is greater than the design flow capacity the

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section7.shtml (2014-08-11)
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  • Stormwater Management Requirements - Mitigating Impacts to the Receiving Drainage System
    Quality Control Where a stormwater management quality control facility is to be located within the highway right of way refer to pages 64 to 74 in Chapter 3 of the Drainage Management Manual MTO 1997 Chapter 4 also presents design information on wet ponds extended dry ponds page 79 and dry ponds page 100 Where a stormwater management quality control detention facility is to be located within the property proposed for development methods documented in the Stormwater Management Planning and Design Manual MOE 2003 are generally suitable except for infiltration facilities Where MTO requirements are set in a previous drainage study refer to Reviewing Previous Drainage Studies Selecting the Level of Water Quality Control The level of control will depend on the sensitivity of the receiving drainage system MTO reserves the right to input into the level of control for water quality treatment imposed upon the land development proposal when drainage from the proposed land development will be entering the highway surface drainage system and will be conveyed to the receiving drainage system In such a case the primary concern for MTO is with regards to the riparian rights of upstream or downstream landowners If the MTO could become unduly exposed to legal action MTO reserves the right to impose or increase whichever is applicable the level of control imposed upon the land development proposal An MTO drainage representative should be contacted for clarification Where the level of control is set in a previous drainage study refer to Reviewing Previous Drainage Studies Identifying Design Criteria for Stormwater Management Controls Where a previous drainage study has been referenced for design criteria refer to Reviewing Previous Drainage Studies Parking Lot or Roof Top Storage The device used to achieve the parking lot or roof top storage The location and layout of the proposed parking lot or roof top storage locations The volume controlled and the corresponding water surface elevation Maintenance procedures responsibilities refer to Clarifying Operation and Maintenance Responsibilities Stormwater Management Detention Facilities The location and layout of the detention facility should be confined within the land development property boundaries The MTO does not generally allow detention facilities to be located within the highway right of way however where a mutual benefit is recognized PHY Directive B014 provides guidance The MTO Regional Highway Planning and Design Office must be contacted before making such a recommendation The following sections should be reviewed Fundamental Purpose of Highway Right of way and Drainage System Drainage Works by Outside Parties Constructed within the Highway Right of way Consider a Planned Shared Use of the Highway Drainage System Legal Agreements Issues to consider when selecting the location and configuration are as follows Maintenance access should be sufficient to allow for the passage of equipment required for the dredging and removal of sediment Multiple storage facilities located in the same drainage basin will affect the timing of the hydrograph as it travels downstream This could increase or decrease peak flows in downstream locations Coordination of stormwater management detention facilities with other drainage structures on a watershed or subwatershed basis is a primary consideration The size of a detention facility is typically measured in terms of surface area and depth refer to the Drainage Management Manual MTO 1997 Chapter 4 page 79 and the Stormwater Management Planning and Design Manual MOE 2003 Inlet and outlet configuration the design of the outflow control will determine the outlet flow rate and hence the detention time for the facility The outlet may include devices such as weirs orifice plates perforated risers or a combination of them A flow splitter may be needed to direct the stormwater runoff into the quality control facility When the required storage volume has been captured the flow splitter will divert the stormwater runoff to a quantity control facility or back to the receiving drainage system Emergency spillway location type and capacity an emergency spillway should be designed to pass the regulatory flood without failure under blocked outlet conditions Reference should be made to the Technical Guidelines for Flood Plain Management in Ontario MNR 1987 for design criteria related to potential loss of life from dam failure Maintenance access provisions should be included to ensure access to trash racks and for removal of sediment Access ramps should be designed to support maintenance equipment Special safety requirements roadside safety for errant vehicles should be considered where detention facilities are located near a highway consult the MTO Regional Highway Planning and Design Office for further details A minimum freeboard depth as a guide use 0 3m Maintenance procedures responsibilities refer to Clarifying Operation and Maintenance Responsibilities Setbacks from highway the Public Transportation and Highway Improvement Act mandates the MTO to enforce setback requirements for structures constructed within certain distances from the highway right of way The stormwater management detention facility is considered to begin at the berm toe of slope which should generally be setback 14m from the highway property line Contact the local MTO District Office or the MTO Regional Highway Planning and Design Office for more details Ownership refer to Clarifying Operation and Maintenance Responsibilities Analyzing and Documenting Results of the Design Where stormwater management quantity controls are provided the approach used in the analysis of the receiving drainage system should be repeated with one change the proposed stormwater control is added to the receiving drainage system Re calculate peak flows water surface elevations or flow velocities at the reference points and range of frequencies specified in Table 7 The SWM report should present results in a table that compares the results for the pre development scenario to the results for the post development scenario s The computational methodology used in the design of the stormwater management controls must be documented in the SWM report The SWM report must also document that the identified impact has been mitigated by the proposed stormwater management controls by showing that peak flows have been reduced to a level to that will restore water surface elevations and or flow velocities at the

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section8.shtml (2014-08-11)
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  • Stormwater Management Requirements - Construction and Operation
    and the proposed construction timeframe and timing constraints for construction spring fall constraints should be noted Construction phasing and timeframes for the different phases should be included Indicate whether the entire site is to be developed all at once or whether the proposed land development is to be phased Sediment control techniques must address both pre serviced and serviced phases of construction Stabilization requirements and the allowable timeframe for land to remain exposed before it is stabilized with sod mulch or hydroseeding should be noted Indicate provisions for the stockpiling of soil Siltation fencing locations should be located at the site boundary at all side slope and down gradient locations Siltation fence should also be used to protect significant features i e provides a limit for grading activities and to control dust nuisance problems to homeowners in existing surrounding land developments Access mud mat locations should be located at each entrance exit location to the construction site The mat can be removed once the access locations are paved The number of access locations to a construction site should be minimized 1 or 2 Catch basin controls where used prevent the migration of sediment into the storm sewers Rock check dam locations should be located in overland swale systems which outlet to the receiving waters Siltation basins can be used to service larger drainage areas stormwater detention facilities can be used as temporary sediment basins during construction wherever possible Topsoil stockpile storage locations for soil storage piles and their distance from roads and drainage channels should be clearly shown Timeframes and proposed works for the stabilization and remediation of topsoil stockpiles should be provided Inspection and maintenance requirements of the sediment and erosion control works should be noted Maintenance should be performed as required to ensure the proper operation of sediment

    Original URL path: http://www.mto.gov.on.ca/english/engineering/drainage/stormwater/section9.shtml (2014-08-11)
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