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NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

13. A Landscape Plan to

13. A Landscape Plan to the approval of the Manager of Community Arenas, Athletics, Design and Development, will be required prior to the Plan of Subdivision registration. All required landscaping above the 5 year storm level, in accordance with the approved plan, shall be installed at the Developer’s cost during the first planting season after final grading of the storm water management pond is completed. The remainder of the planting shall commence at the direction of the Department of Parks and Recreation, at the Developer’s cost. The Developer shall maintain the pond for a minimum of two years once final planting is complete. Landscape Plans are to be prepared by a Landscape Architect (see Appendix A & B). 14. That in all cases, implementation of these policies and guidelines shall have regard for approved Watershed, Sub-Watershed, and Master Drainage Plans. FOR SUBDIVISIONS ONLY: In addition to clauses 1 to 14, the following policies shall apply to subdivisions only: 15. Community trails where they have been identified and required by the City, shall be implemented above the maximum extended detention level, or 5 year storm level, in order to prevent frequent flooding. Trails shall have a minimum width of 3.0m. 16. To enhance user comfort and safety, a 3.0m zone on each side of the community trail shall be designed in such a way that sightlines are preserved. If barriers are required, they must not interfere with visibility or create entrapment areas. In situations where a community trail is designed within the maximum peak flow depth zone, the 3.0m separation above the trail shall have a maximum slope of 3:1. Below the trail, the 3.0m separation shall have a maximum slope of 6:1. This zone shall be planted with low ground covers (see Figure 4). * Deciduous tress should be planted at a minimum distance of 1.5m from the edge of the trail. Maintenance is required to ensure that tree canopies are raised to a minimum of 2.2m, and shrubs must be regularly prevented from naturalizing this zone. The planting of coniferous trees within this zone is not recommended. 17. Maintenance access routes shall be provided to both inlet and outlet structures and forebays. A minimum 3.0m wide, hard surfaced access with a minimum 10m turning radius (inside radial), and a flat 10m loading area is required. Maintenance access routes shall require a maximum slope of 10:1. The design of maintenance routes and loading areas shall be to the approval of the Department of Public Works. 18. An information sign posted at an appropriate location such as a public access point, detailing the purpose of the pond, phone number for further information, and any other relevant information is required for all storm water management facilities (see Figure 6). All costs associated with the provision of the sign shall be borne by the Developer. Sign details shall be approved to the satisfaction of the Manager of Community Arenas, Athletics, Design and Development. Depending on the size of the storm water management facility and number of public access points, multiple signs may be required as determined by the City. 19. In order to prevent surcharging of storm sewers upstream, storm sewer pond inlet inverts shall not be lower than the maximum 5 year storm level, or the maximum extended detention level; which ever is greater in elevation (see Figure 5).

FOR SITE PLANS ONLY: In addition to Clauses 1 to 14, the following policies shall apply to site plans only: 20. The placement of children’s play equipment shall not be permitted within storm water management facilities. 21. Storm water QUANTITY management strategies can be accommodated within parking areas to a limit of 0.3m in depth. 22. Storm water QUALITY management strategies can not be accommodated within parking areas. Oil grit separators may only be used in conjunction with alternate methods for water quality management. 23. Where appropriate, areas subject to the collection of contaminants or spills shall be fitted with adequate oil/grit separators. 24. Rooftop storage shall be considered as a storm water management option and shall be infiltrated as appropriate. 25. In cases where storm water management facilities can not be aesthetically accommodated above ground, underground storage shall be considered as an alternative option.

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