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Stormwater Management Requirements for Land Development Proposals

MTO SWM Requirements Checklist

The checklists presented below provide a comprehensive list of potential documentation requirements to be included in a SWM report submitted to MTO. It is the responsibility of the drainage practitioner to determine the applicability of the potential documentation requirements. Selection should be based on the suitability to each particular land development proposal, and will depend on the scale and nature of the proposed land development.

Checklist 1: Background Information Required to Identify Drainage Issues.
Checklist 2: Receiving Drainage System Information.
Checklist 3: Assessing Impacts to the Receiving Drainage System
Checklist 4: Construction Operation and Maintenance Issues.
Checklist 5: Supplemental Drainage Information.

These checklists should be used to check that:

the various tasks presented in the subsequent sections of this document (refer to Figure 1), have been recognised in the SWM report;
the documentation in the SWM report is adequate; and
all drainage issues and impacts have been identified and mitigated to the satisfaction of MTO.

Checklist 1: Background Information Required to Identify Drainage Issues

Download Checklist 1 for printing (PDF - 44K)

Category	Items or Elements Discussed in SWM Report	Applicable	Documented
Status of Land Development Proposal	Preliminary Stormwater Management Report?
	Detail Stormwater Management Report?
	Zoning Status of Land Development Proposal: Current Designation Amendments
	Existence of MTO Conditions of Approval on: Draft Plan of Subdivision Site Plan
	Status of Regulatory Agencies Approvals/Permits MNR MOE Conservation Authority Municipality Others _____________________________
Referenced Drainage Studies	Watershed, subwatershed or master drainage studies
	Approved SWM reports for same site
	Approved detailed SWM reports for same site
	MTO environmental study reports
	MTO preliminary design reports
	MTO detail design reports
	Other drainage studies Flood Damage Reduction Program Study (FDRP) Erosion Control Study Flood Control Study Others ___________________________
Water Quality Treatment	Requirements: MOE MNR MTO Others ______________________________
Fish Habitat	Requirements: MOE MNR MTO Others ______________________________

Checklist 2: Receiving Drainage System Information

Download Checklist 2 for printing (PDF - 133K)

Category	Items or Elements Discussed in SWM Report	Applicable	Documented
Receiving Drainage System Information	Components (other than highway drainage system): stream channel storm sewers roadside ditches bridges, culverts stormwater management facilities other ______________________________
	Operation and Maintenance Responsibilities for Components (other than highway drainage system) agency organisation person other ______________________________
	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
Calculations	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 the Receiving Drainage System modifications to highway drainage works modification to other components of receiving drainage system erosion protection
	Results of Modifications peak flows at references points restored water surface elevations at reference points restored level of erosion protection/ flow velocities at reference points capacity of highway drainage system

Checklist 4: Construction Operation and Maintenance Issues

Download Checklist 4 for printing (PDF - 19K)

Category	Items or Elements Discussed in SWM Report	Applicable	Documented
Interim and Final Drainage Systems	Drainage Plan interim drainage system layout, components and timeframe of use final drainage system layout and components
Erosion and Sediment Control Plan	During Construction temporary erosion control works, layout, location and timeframe of use maintenance scheduling of temporary erosion control works maintenance schedule of permanent erosion works maintenance on highway drainage system during construction
Ownership, Operational and Maintenance Responsibilities	Legal Agreements Party Responsibilities for: owner of site drainage system maintenance of site drainage system maintenance of permanent erosion control works maintenance on highway drainage system after construction MTO maintenance responsibilities

Checklist 5: Supplemental Drainage Information

Download Checklist 5 for printing (PDF - 12K)

Category	Items or Elements Discussed in SWM Report	Applicable	Documented
Rationale and Justification	Documentation to Support Selection of: level of detail used in analysis hydrologic and hydraulic computer models selection of computational methods
Figures, Maps and Plans	Documentation location/site map land use map soils map natural resources map proposed land development and grading plan drainage plans catchment discretization schematic drainage system connectivity flowchart stormwater management plan In-stream works plan temporary sediment and erosion control location of stream cross-sections
tables and Graphs	Input and Output Parameters soil types and CN numbers stormwater management works design storm events hydrologic computational parameters stage-storage-discharge curves hydrologic analysis results hydraulic computation water surface elevations flow velocities
Letters, Permits and Supporting Computer Files	SWM report prepared and signed by a Professional Engineer
	Copies of correspondence letters of approval copies of permits municipality acceptance of ownership of site drainage system other
	Hydrologic modelling input and output disk copy; or computer printout
	Hydraulic modelling input and output disk copy; or computer printout

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