Documentation

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The following, comprehensive list is presented as a basis for discussion between regulatory authorities and design practitioners.

Site Description

  • Location (key plan, municipal address, nearest roads, watershed and subwatershedThe drainage area of one or more contributing watercourses to a river.);
  • Existing Conditions (land use on site and surrounding areas);
  • Natural Heritage features;
  • Proposed Conditions;
  • Drainage Area (for the site, tributary and watershedThe drainage area of a river.An area of land that drains into a river or a lake. The boundary of a watershed is based on the elevation (natural contours) of a landscape.);
  • Watercourses, wetlands present on site, and type (permanent or intermittent);
  • Drainage patterns and ultimate drainage location/outfallThe point, location, or structure where wastewater or drainage discharges from a sewer pipe, ditch or other conveyance to a receiving body of water.;

Background Information

  • Pre-submission meeting verification;
  • Reports from pre-consultation with MOECP and other agencies (especially related LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. credits);
  • Watershed plans;
  • Sub-Watershed plans;
  • Master drainage plans (MDPs);
  • Other previous reports and relevant SWMStormwater Management requirements;
  • Existing models;
  • Geotechnical report;
  • Hydrogeological report;

Figures and drawings

  • Location plan in the report;
  • Key plan on the drawings;
  • All watercourses and names of watercourses shown on all figures and drawings;
  • Pre-developmentrefers to the characteristics and functions of a system prior to urban development. and post-development drainage plans for hydrologic model(s) which include:
    • Existing contours;
    • Drainage direction (minor and major system);
    • Catchments ID's;
    • Areas and imperviousness;
    • Uncontrolled areas;
    • 100 year capture;
    • Site outlets; and
    • LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. facility location and associated tributary areas;
  • Model schematics;
  • Storm drainageNatural or artificial means of intercepting and removing surface or subsurface water (usually by gravity)., grading and general servicing plans;
  • LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. practice design drawings and details;
  • Erosion and sediment control plans;
Parameter Plan Detail Profile Description
Location x Area extent shown on plan view (bump-outs, municipal reserves, private lots, parks)
Surface area x Outlined on plan view drawings and stated in report
Inlet x x shown on plan view and typical details provided (curb cuts, flow spreader, ribbon curb)
Materials x Materials specs (soil, drainage layer), depth, hydraulic conductivityA parameter that describes the capability of a medium to transmit water., porosity
Vegetation x x Planting plan and vegetation details (species, mature density, succession plan)
Outlet x x x Underdrain spec and slope, spill elevation, catch basinGround depression acting as a flow control and water treatment structure, that is normally dry. type and grate, weir type and location, inlet control device details
CatchmentThe land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale. x Delineated catchmentThe land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale. area directed to bioretention facility
Subsurface materials x Layer order (filter, reservoir, choker course, geotextiles (if using)) and specifications (gradation, hydraulic conductivityA parameter that describes the capability of a medium to transmit water., void space)
Depth x x Depth of each layer, reservoir retention depth (if applicable), surface ponding depth (if applicable)
Slope x x Sub-base slope and surface slope
Flow Arrows x From contributing area and overflow route
Water depth x Ponding depth and water surface elevation during design storm and maximum prior to overflow
Inundation x Extent of of inundation during design storms
Erosion controlIncludes the protection of soil from dislocation by water, wind or other agents. x x Located at inlet, outlet if overland spill

Design Information

  • Consistent hydrology modelling to be utilized for each development application and/or consistent with MESPIs a community-scale planning assessment of servicing and environmental considerations for a development project./MSP/Studies.
  • Supporting information has been included for all modelling parameters and calculations.
  • Stage-Storage-Discharge calculations provided for each LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. facility including design information on control and emergency overflow weirs.
  • Flow and storage summary tables provided which reference the associated drainage areaThe total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds., catchmentThe land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale. ID, outlet(s) and differentiate between controlled and uncontrolled areas.
  • Identify and show seasonal high groundwater levels in report and on drawings;
  • Per MOECC SWM manual, 2003 (i.e. Drainage areaThe total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds., required volume, slopes, forebayA pretreatment basin at the inlet of a practice that allow settling out of sediment and associated contaminants suspended in urban runoff., etc.);
  • The SWMStormwater Management report and drawings are to include a table summarizing required storage, provided storage and associated elevation and flow for the permanent pool, 25mm (extended detentionA stormwater design features that provides for the gradual release of a volume of water in order to increase settling of pollutants and protect downstream channels from frequent storm events.), and 2 through 100 year return period storm events where applicable for each facility;
  • An operations and maintenance manual (includings a maintenance schedule) should be included in the SWMStormwater Management Report for all LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. facilities in accordance with municipal requirements;
  • Complete information on proposed manufactured treatment devices is to be provided including current status under ETV protocols;

Quantity control

  • RunoffThat potion of the water precipitated onto a catchment area, which flows as surface discharge from the catchment area past a specified point.Water from rain, snow melt, or irrigation that flows over the land surface. coefficient or imperviousness calculations;
  • Analysis using appropriate storm distributions;
  • Pre-developmentrefers to the characteristics and functions of a system prior to urban development. peak flow (m³/s);
  • Post-development uncontrolled peak flow (m³/s);
  • Post-development controlled peak flow (m³/s);
  • LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. Facility Type;
  • Stage – Storage – Discharge Table;
  • Outlet design and calculations;
  • Total storage required (m3);
  • Total storage provided (m3);
  • Table comparing provided versus required;
  • Overland flow conveyance and design;
  • External drainage conveyance (100 year and Regional);

Quality control

  • Level of protection;
  • Drainage areaThe total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds. to facility in hectares;
  • Percentage imperviousA hard surface area (e.g., road, parking area or rooftop) that prevents or retards the infiltration of water into the soil. – total and directly connected areas;
  • SWMStormwater Management facility monitoring and maintenance requirements;

Hazard land management

  • Regional event and 1:100 year flood lines under existing and proposed conditions shown on appropriate plan drawings;
  • Valley top of bank, stream erosion(1) The wearing away of the land surface by moving water, wind, ice or other geological agents, including such processes as gravitation creep; (2) Detachment and movement of soil or rock fragments by water, wind, ice or gravity (i.e. Accelerated, geological, gully, natural, rill, sheet, splash, or impact, etc)., steep slope allowances and meanderbelt assessed (confined stream systems only);
  • Wetlands and required setbacks determined and identified on plans;
  • Meanderbelt assessment and/or setback determined and identified on plans;
  • Wave uprush and/or wind setup elevations calculated;
  • “Limit of development” shown on plans;
  • Survey and floodplainThe area adjacent to a stream that is, on average, inundated once a century mapping submitted (see below);
  • Hydraulic modelling and analysis including digital files;

Other

  • Upon approval of the SWMStormwater Management design, a digital copy of the stormwater drainage plan is to be submitted including the location and size of the SWMStormwater Management facility in GIS format;

Floodplain mapping and documentation minimum requirements

  1. Hydraulic sections with regulated floodplainThe area adjacent to a stream that is, on average, inundated once a century elevations and cross-section identification;
  2. Existing and proposed floodplainThe area adjacent to a stream that is, on average, inundated once a century delineation;
  3. Topographic information including elevations and contours;
  4. Conveyance structures including dams, bridges, culverts and weirs;
  5. Man-made structures as applicable including buildings, roads, railways and trails;
  6. Natural reservoirs or natural storage areas;
  7. Spills analysis as applicable;
  8. Cut/fill analysis in the regulated area as applicable;
  9. Natural features such as watercourses and wetlands;
  10. Floodplain mapping and supporting documentation signed and stamped by a P.Eng.

Survey documentation minimum requirements

For any submission which contains drawings or figures that present survey information, the following list of minimum requirements must be included:

  1. Document with text descriptor identifying overall approach and methodology;
  2. Drawing/Figure Title;
  3. Date, and Revision List where applicable;
  4. Legible Scale and North direction arrow;
  5. OLS Surveyor Name and contact information, as applicable;
  6. Geodetic benchmark data used in survey, as applicable;
  7. Available survey data for topographic surface, structures, features, etc.;
  8. Structures invert, obvert elevations and dimensions as applicable;
  9. Bathymetry as applicable;
  10. Documentation to support reported data accuracy;
  11. Methodology for survey data collected i.e. Total Station, GIS, Rod and Level;
  12. Photo log of structures survey including upstream, downstream and structures completed with structure survey;
  13. Drawings and / or figures to be submitted both electronically and in hard copy as requested;
  14. Digital copy of the survey data when applicable; and
  15. Submission components to be stamped and signed by an OLS, P.Eng. or C.E.T. as relevant.

Geospatial data submission minimum requirements

For a submission which contain drawings, figures, reports, modelling and / or memos that present geospatial information and its analysis; the following list of minimum requirements must be included:

  1. Text summary identifying methodology and software used in geospatial analysis;
  2. Acquisition type i.e. LIDAR, orthophotos, etc.;
  3. Date of data acquisition;
  4. Name of supplier of digital information and their contact information;
  5. Quality Assurance / Quality Control methodology for geo-spatial as applicable;
  6. Data Co-ordinate system;
  7. Data Projection;
  8. Data Horizontal and vertical resolution;
  9. Data Accuracy for each axis as applicable;
  10. Description of grid resolution;
  11. Drawing and / or figure scale identified as applicable;
  12. Contours presented at minimum 0.5 m increments;
  13. Orthophoto Elevation Data i.e. study area break lines and DTM points;
  14. LIDAR Elevation Data i.e. study area point cloud (as applicable);
  15. Digital Elevation Model (DEM) as applicable;
  16. Description of modifications to surface including adjustments to the TIN from other sources (i.e. surveyed culverts, new infrastructure invert and obvert elevations etc.);
  17. Flood limit data;
  18. Drawings and / or figures to be submitted both electronically and in hard copy when requested;
  19. In modelling files and documentation to maintain existing watercourse(a) A natural well-defined channel produced wholly or in part by a definite flow of water and through which water flows continuously or intermittently. Also, a ditch, canal, aqueduct, or other artificial channel for the conveyance of water to or away from a given place, as for the draining of a swamp.(b) A stream or current of water. Legally, a natural stream arising in a given drainage basin but not wholly dependent for its flow on surface drainage in its immediate area, flowing in a channel with a well-defined bed between visible banks or through a definite depression (as a ravine or swamp) in the surrounding land, having a definite and permanent periodic supply of water (the stream may be intermittent), and usually, but not necessarily having a perceptible current in a particular direction and discharging at affixed point into another body of water.(c) A legal right permitting the use of a flow of a stream (especially of one flowing through one’s land) or the receipt of water discharged upon land belonging to another. naming conventions were applicable;
  20. Projected Co-ordinate system: Preferably NAD 1983 UTM Zone 17N;
  21. Accepted Original Geospatial Data file format: File Geodatabase or Shapefiles; and
  22. Submission components to be stamped and signed by an OLS, P.Eng. or C.E.T. as relevant.