Volume 2-05, Chapter 3 - City of Wichita

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Section 3.4.5 - Green Roof • When dry, all of the growth media are light-weight and prone to wind erosion. It is important to keep media covered before planting and ensure good coverage after vegetation is established. • Selecting the right vegetation is critical to minimize maintenance requirements. Due to the shallowness of the growing medium and the extreme desert-like microclimate on many roofs, plants are typically alpine, dryland, or indigenous. Ideally, the vegetation should be: • Drought-tolerant, requiring little or no irrigation after establishment; • Self-sustaining, without fertilizers, pesticides, or herbicides; • Able to withstand heat, cold, and high winds; • Shallow root structure; • Low growing, needing little or no mowing or trimming; and, • Perennial or self propagating, able to spread and cover blank spots by itself. • A mix of sedum/succulent plant communities is recommended because they possess many of these attributes. Certain wildflowers, herbs, forbs, grasses, mosses, and other low groundcovers can also be used to provide additional habitat benefits or aesthetics; however, these plants need more watering and maintenance to survive and keep their appearance. • Green roof vegetation is usually established by one or more of the following methods: seeding, cuttings, vegetation mats, and plugs/potted plants. • Seeds can be either hand sown or broadcast in a slurry (hydroseeded). Seeding takes longer to establish and requires more weeding, erosion control, and watering than the other methods. • Cuttings or sprigs are small plant sections. They are hand sown and require more weeding, erosion control, and watering than mats. • Vegetation mats are sod-like mats that achieve full plant coverage very quickly. They provide immediate erosion control, do not need mulch, and minimize weed intrusion. They generally require less ongoing maintenance than the other methods but are more expensive. • Plugs or potted plants may provide more design flexibility than mats. However, they take longer to achieve full coverage, are more prone to erosion, need more watering during establishment, require mulching, and more weeding. • Irrigation is necessary during the establishment period and possibly during drought conditions, regardless of the planting method used. The goal is to minimize the need for irrigation by paying close attention to plant selection, soil, and various roof characteristics. • It is necessary to provide controlled overflow point(s) to prevent overloading of roof. Page 3 - 210 Volume 2, Technical Guidance
Section 3.4.5 - Green Roof 3.4.5.3 Inspection and Maintenance Requirements Table 3-11 Typical Maintenance Activities for Green Roofs Activity Watering to help establish vegetation Replant to cover bare spots or dead plants Weeding (as needed, based on inspection) Water and trimming to prevent fire hazards (if grasses or similar plants are used) Inspect drains for clogging Inspect the roof for leakage If leaks occur, remove and stockpile vegetation, growth media, and drainage layer. Replace membrane and root barrier, followed by stockpiled material. Schedule As needed Monthly Two or three times yearly As needed Twice per year Annually, or as needed Upon failure 3.4.5.4 Example Schematic Figure 3-62 Typical Green Roof Cross Section (from City of Portland, Oregon) Volume 2, Technical Guidance Page 3 - 211
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CHAPTER 3 STORMWATER CONTROLS TABLE
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Chapter 3 - Table of Contents 3.2.8
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Chapter 3 - Table of Contents LIST
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Section 3.1 - Stormwater Management
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Section 3.2.1 - Stormwater Pond 3.2
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Section 3.2.1 - Stormwater Pond 1'
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Section 3.2.1 - Stormwater Pond 3.2
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Section 3.2.5 - Enhanced Swale 3.2.
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Section 3.2.5 - Enhanced Swale 3.2.
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Section 3.2.7 - Soakage Trench 3.2.
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Section 3.2.8 - Surface Sand Filter
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Section 3.3 - Secondary TSS Treatme
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Section 3.3.1 - Proprietary Treatme
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Section 3.3.2 - Gravity (Oil-Water)
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Section 3.3.3 - Alum Treatment 3.3.
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Volume 2-05, Chapter 3 - City of Wichita

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