Documentation

From LID SWM Planning and Design Guide
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The following, comprehensive list is presented as a basis for discussion between regulatory authorities and design practitioners [1].

Site Description[edit]

  • Location (key plan, municipal address, nearest roads, watershed and subwatershed);
  • Existing Conditions (land use on site and surrounding areas);
  • Natural Heritage features;
  • Proposed Conditions;
  • Drainage Area (for the site, tributary and watershed);
  • Watercourses, wetlands present on site, and type (permanent or intermittent);
  • Drainage patterns and ultimate drainage location/outfall;

Background Information[edit]

  • Pre-submission meeting verification;
  • Reports from pre-consultation with MOECC and other agencies (especially related LID credits);
  • Watershed plans;
  • Sub-Watershed plans;
  • Master drainage plans (MDPs);
  • Other previous reports and relevant SWM requirements;
  • Existing models;
  • Geotechnical report;
  • Hydrogeological report;

Figures and drawings[edit]

  • Location plan in the report;
  • Key Plan on the drawings;
  • All watercourses and names of watercourses shown on all figures and drawings;
  • Pre-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
    • SWM facility location and associated tributary areas;
  • Model schematics;
  • Storm drainage, grading and general servicing plans;
  • SWM facility design drawings and details;
  • Erosion and sediment control plans;

Design Information[edit]

  • Consistent hydrology modelling to be utilized for each development application and/or consistent with MESP/MSP/Studies.
  • Supporting information has been included for all modelling parameters and calculations.
  • Stage-Storage-Discharge calculations provided for each SWM facility including design information on control and emergency overflow weirs.
  • Flow and storage summary tables provided which reference the associated drainage area, catchment 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 area, required volume, slopes, forebay, etc.);
  • The SWM report and drawings are to include a table summarizing required storage, provided storage and associated elevation and flow for the permanent pool, 25mm (extended detention), and 2 through 100 year return period storm events where applicable for each facility;
  • An operations and maintenance manual should be included in the SWM Report for all LID facilities in accordance with municipal requirements;
  • Complete information on proposed manufactured treatment devices is to be provided including current status under ETV protocols;
  • An operations and maintenance manual is to be provided that includes a maintenance schedule;

Quantity control[edit]

  • Runoff coefficient or imperviousness calculations;
  • Analysis using appropriate storm distributions;
  • Pre-development peak flow (m3/s);
  • Post-development uncontrolled peak flow (m3/s);
  • Post-development controlled peak flow (m3/s);
  • LID 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[edit]

  • Level of Protection;
  • Drainage Area to Facility in hectares;
  • Percentage Impervious – total and directly connected areas;
  • SWM Facility Monitoring and Maintenance Requirements;

Hazard land management[edit]

  • Regional event and 1:100 year flood lines under existing and proposed conditions shown on appropriate plan drawings;
  • Valley top of bank, stream erosion, 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 floodplain mapping submitted (see below);
  • Hydraulic modelling and analysis including digital files;

Other[edit]

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

Floodplain mapping and documentation minimum requirements[edit]

  1. Hydraulic sections with regulated floodplain elevations and cross-section identification;
  2. Existing and proposed floodplain 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[edit]

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[edit]

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 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.
  1. Ontario Provincial Standard Specification. (2014). Construction Specification and for Seed and Cover OPSS.PROV 804. Retrieved from http://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/0/3a785d2f480f9349852580820062910a/$FILE/OPSS.PROV 804 Nov2014.pdf