Green City, Clean Waters and Stormwater Regulations. Figure 4.1-1: Bioinfiltration/Bioretention Basin with Typical Features. 57 stone can meet this specification.

For proposed buildings without basements and proposed retaining walls, the setback is measured from the foundation and may be waived if the foundation is proposed to be designed with the basin's proximity in mind. This exfiltration flow must be routed through the primary outlet of the bioretention area, not discarded from the stormwater model. Install energy dissipaters as specified on the plans, if applicable. If soil amendments are installed and the tested infiltration rate is determined to be outside of the PWD-allowable range or varies significantly from the design infiltration rate, additional soil amendments and/or an SMP redesign will be required. All rights reserved. Flow-through planter box planting requires that plants be supplied with nutrients that they would otherwise receive from being part of an ecosystem. Inspect for sediment build-up, erosion, and vegetative conditions. The designer is referred to Section 4.10, Pretreatment, for more information on pretreatment systems. This includes fully or partially lined basins. Construction Contractor As-built ManualThe Green Stormwater Infrastructure (GSI) As-Built Survey and Drafting Manual describes the process for collecting and drafting as-built survey data for GSI systems in the City of Philadelphia. Implemented in 2011, Green City, Clean Waters represents an agreement between Philadelphia, the U.S. Environmental Protection Agency and the Pennsylvania Department of Environmental Protection to meet Federal water pollution standards set by the Clean Water Act. COVID19 emergency to avoid delays in conducting fire flow tests. Bioinfiltration SMPs remove stormwater via infiltration into the surrounding soils while bioretention SMPs attenuate runoff with flow-regulating underdrains. 4 Stormwater Management Practice Guidance, Ch. The characteristics of the soil for the bioinfiltration/bioretention SMP are perhaps as important as the facility location, size, and treatment volume. Bioinfiltration/bioretention SMPs can be designed with additional storage beyond the WQv and with outlet controls that allow all remaining applicable Stormwater Regulations to be met. We’ve tried to understand why that is the case.”. ©2019 Philadelphia Water.

Inlet controls may include flow splitters, curbless design/curb openings, energy dissipaters, and inlets. The diameter of the cleanout must match the diameter of its connecting pipe up to eight inches. Underdrains must be made of continuously perforated high-density polyethylene (HDPE) plastic piping with a smooth interior and a minimum inner diameter of four inches. Bioinfiltration/bioretention SMPs are preferred for a number of reasons, including installation and maintenance cost, ease of maintenance, habitat creation, nutrient cycling, and aesthetics. Officials acknowledge that how water tastes and looks can change depending on where it travels, including through older pipes far from a main. Ranges of particle size distribution, as determined by pipette method in compliance with ASTM F-1632, are as follows: Planting soil should be screened and free of stones larger than a half-inch (12.7 millimeters) in any dimension. Download summaries of this SMP and its maintenance guidance, with quick reference information for clients and developers: The designer is referred to. PWD & City business activities return to normal, this procedure will be revisited. Trees and shrubs must be freshly dug and grown in accordance with good nursery practice.

An infiltrating SMP within the zone of influence of any nearby sewers or sewer laterals must be installed with an impervious liner. It is also intended to improve the working relationship between plumbers, customers, and the City by clarifying what is expected of private plumbing work in the street.

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