User talk:Jenny Hill

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Many of the dimensions in a bioretention system are relatively constrained by the performance requirements of the individual component. There is greatest flexibility in the ponding depth and the depth of the storage reservoir beneath the optional underdrain pipe. The order of operations in calculating these dimensions depends on whether an underdrain is desired.

Component Void ratio Recommended depth (with underdrain pipe) Recommended depth (no underdrain pipe)
Ponding depth 1 300 mm See below
Mulch
  • 0.7 for wood based
  • 0.4 for aggregate based
 75 ± 25 mm




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Formal Infobox
Common name: Wordiness virus
Medical name: (see notebox below)
Habitat: here, 19-Dec-2008

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A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

An underlying bed filled with aggregate or other void-forming fill material that temporarily stores stormwater before infiltrating into the native soil or being conveyed by an underdrain pipe.

A perforated pipe used to assist the draining of soils.

The void ratio (e) of a mixture is the ratio of the volume of void-space to the volume of solids. It is closely related to the concept of porosity (n) where porosity is the ratio of the volume of void-space to the total or bulk volume of the mixture. e = Volume of voids/Volume of solids = n/(1-n)

a top dressing over vegetation beds that provides suppresses weeds and helps retain soil moisture in bioretention cells, stormwater planters and dry swales.

A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.

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