Volume 2-05, Chapter 3 - City of Wichita
Volume 2-05, Chapter 3 - City of Wichita Volume 2-05, Chapter 3 - City of Wichita
Section 3.4.4 - Modular Porous Paver Systems 3.4.4.5 Example Schematics Adjacent Pavement Open Space POROUS PAVER SYSTEM Sand Layer (ASTM C- 33) Filter Fabric Concrete Pavement Edge Base Course (gravel, minimum 9 inches thick) Filter Fabric Undisturbed Soil Figure 3-60 Modular Porous Paver System Section Figure 3-61 Typical Modular Porous Paver System Applications (Source: UDFCD, 1999) Page 3 - 206 Volume 2, Technical Guidance
Section 3.4.5 - Green Roof 3.4.5 Green Roof Other Water Quality Facility Description: A green roof uses a small amount of substrate over an impermeable membrane to support a covering of plants. The green roof detains/retains runoff from the otherwise impervious roof surface as well as moderate rooftop temperatures. With the right plants, a green roof will also provide aesthetic or habitat benefits. Green roofs have been used in Europe for decades. (Hamilton Building, Portland OR) KEY CONSIDERATIONS DESIGN CRITERIA: • Relatively new in North America • Potential for high failure rate if poorly designed, poorly constructed, not adequately maintained ADVANTAGES / BENEFITS: • Provides reduction in runoff volume • Energy savings, aesthetics, allows dual use, noise reduction, reduces urban heat island effect DISADVANTAGES / LIMITATIONS: • High cost • Requires additional roof support • Requires more maintenance than regular roofs • Special attention to design and construction needed • Requires close coordination with plant specialists • Potential for leakage due to plant roots penetrating membrane POLLUTANT REMOVAL -- Total Suspended Solids -- Nutrients – Total Phosphorus & Total Nitrogen -- Metals – Cadmium, Copper, Lead & Zinc STORMWATER MANAGEMENT SUITABILITY Water Quality Protctio Channel Protection OnSite Flood Control Downstream Flood Control IMPLEMENTATION CONSIDERATIONS L H H Land Requirements Relative Capital Costs Maintenance Burden Residential Subdivision Use: No High Density/Ultra-Urban: Yes Drainage Area: No restrictions. Soils: No restrictions L=Low M=Moderate H=High -- Pathogens – Coliform, Streptococci & E. Coli Volume 2, Technical Guidance Page 3 - 207
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- Page 163 and 164: Section 3.3.3 - Alum Treatment 3.3.
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Section 3.4.4 - Modular Porous Paver Systems<br />
3.4.4.5 Example Schematics<br />
Adjacent<br />
Pavement<br />
Open Space<br />
POROUS PAVER<br />
SYSTEM<br />
Sand Layer (ASTM C-<br />
33)<br />
Filter Fabric<br />
Concrete<br />
Pavement<br />
Edge<br />
Base Course<br />
(gravel, minimum<br />
9 inches thick)<br />
Filter Fabric<br />
Undisturbed Soil<br />
Figure 3-60 Modular Porous Paver System Section<br />
Figure 3-61 Typical Modular Porous Paver System Applications<br />
(Source: UDFCD, 1999)<br />
Page 3 - 206<br />
<strong>Volume</strong> 2, Technical Guidance
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