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NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

STORM WATER MANAGEMENT

STORM WATER MANAGEMENT FACILITIES DESIGN PRINCIPLES PURPOSE: “To achieve the highest level of utilization, aesthetics, environmental benefits and ease of maintenance”. FOR SUBDIVISIONS AND SITE PLANS: 1. a) Storm water management areas for subdivisions will be on lands dedicated to the City in addition to any lands required to be dedicated for park purposes under the Planning Act. b) Storm water management areas for site plans will be on lands retained by the owner. All costs associated with the construction and continuing maintenance of storm water management facilities shall be borne by the owner. 2. Storm water management DRY PONDS shall be designed to limit the maximum depth of water to 1.8m above the lowest point of the storm water basin. An additional 0.3m free board is required above the maximum peak flow flood level. The maximum depth of the extended detention zone shall not exceed 1.0m above the lowest point of the pond. Maximum peak flow attenuation shall be limited to an additional 0.8m (see Figure 1). a) A maximum 5:1 slope shall extend from the bottom of the pond to the limit of maximum extended detention, with a minimum horizontal length of 3.0m. The minimum allowable gradient on the bottom of the basin shall be 1.0%, and the maximum gradient shall be 5.0%. 3. Storm water management WETLANDS shall be designed to limit the maximum depth of water to 2.1m above the lowest point of the storm water basin. An additional 0.3m freeboard is required above the maximum peak flow flood level. The maximum depth of the extended detention zone shall not exceed 1.0m above the permanent pool elevation. Maximum peak flow attenuation shall be limited to an additional 0.8m. The permanent pool depth shall range between a minimum depth of 0.15m to a maximum depth of 0.3m (see Figure 1). a) A maximum 5:1 slope below the permanent pool level shall be required around the entire storm water management pond. b) A maximum 5:1 slope above the permanent pool level shall be required around the entire storm water management pond. The slope shall extend from the permanent pool level, to the limit of maximum extended detention. The horizontal distance of this slope must be a minimum of 3.0m. c) Where required, micropools shall have an additional maximum depth of 0.3m below the permanent pool level. Micropools shall not exceed 5% of the total Wetland surface area (see Figure 2). 4. Storm water management WET PONDS shall be designed to limit the maximum depth of water to 3.3 m above the lowest point of the storm water basin. An additional 0.3m freeboard is required above the maximum peak flow flood level. The maximum depth of the extended detention zone shall not exceed 1.0m above the permanent pool elevation. Maximum peak flow attenuation shall be limited to an additional 0.8m. The permanent pool depth shall range between a minimum depth of 1.0m to a maximum depth of 1.5m (see Figure 1).

a) A maximum 5:1 slope below the permanent pool level shall be required around the entire storm water management pond. The horizontal distance of this slope must be a minimum of 3.0m. A slope commencing from this point to the lowest point of the storm water basin shall be a maximum of 3:1. b) A maximum 5:1 slope above the permanent pool level shall be required around the entire storm water management pond. The slope shall extend from the permanent pool level, to the limit of maximum extended detention. The horizontal distance of this slope must be minimum of 3.0m. c) The use of WET PONDS for site plans will not be permitted. 5. Where forebays are required, the permanent pool depth shall range between a minimum depth of 1.0m to a maximum depth of 1.5m in which a maximum depth of 0.5m shall be used for sediment accumulation. Forebays shall not exceed 33% of the total pond surface area. All other aspects regarding the design of forebays shall conform to the above Wet Pond standards. Excluding maintenance access routes, all access to forebays shall be discouraged through shrub plantings (see Figure 3). 6. From the point of maximum extended detention, to the lower limits of the “Safety Separation” area or property line where it abuts private property, slopes shall vary between 2:1 to 6:1, and have a maximum average slope of 4:1, not including the maximum 10:1 maintenance access slope. 7. For Wet Ponds and Wetlands, all slopes 5:1 and steeper ranging from a minimum horizontal distance of 3.0m from the permanent pool level to the property line (not including easements, walkways, and trails), shall be vegetated with shrubs, trees and low maintenance ground cover. For Dry Ponds, all slopes 5:1 and steeper, ranging from a minimum horizontal distance of 3.0m from the pond bottom level to the property line (not including easements, walkways, and trails), shall be vegetated with shrubs, trees and low maintenance ground cover. In areas where shrubs and trees are not permitted or warranted, low maintenance ground cover is required. 8. Shrubs and trees shall be native species and ground cover is to be of a low maintenance variety (see Appendix A). 9. Where trees are to be planted, they must be planted at a minimum rate of 1 tree per 50 square metres. The density of shrub plantings shall vary depending on the degree of slope. Shrub plantings shall prevent public access through all 2:1 slopes for safety purposes. Access through 3:1 slopes shall be discouraged through coverage intensity of shrub plantings. * The density of vegetation should vary according to the degree of slope. The purpose of the bar scale is not to encourage repetitive landscape design, however, to act as a relative guide to associate shrub plant densities with the appropriate slope. 10. Designed pedestrian access areas shall require a maximum slope of 6:1. 11. Fencing of storm water management facilities shall be discouraged however, may be required as determined by the City. 12. Notwithstanding policies 2, 2(a), 3, 3(a), 3(b), 3(c), 4, 4(a), 4(b), 5, and 11 above, in the case of headwall designs, the depth of water related to adjoining side slopes may vary, and fencing may be required for safety purposes.

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