Difference between revisions of "User talk:Jenny Hill"

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* Step 6: Multiply the depth of each separate component by the void ratio and then sum the total to find the 1 dimensional storage (in mm).
 
* Step 6: Multiply the depth of each separate component by the void ratio and then sum the total to find the 1 dimensional storage (in mm).
 
* Step 7: Calculate the required total storage (m<sup>3</sup>):
 
* Step 7: Calculate the required total storage (m<sup>3</sup>):
−
<math>Storage=RVC_T\times A_c\times0.095</math>
+
<math>Storage=RVC_T\times A_c\timesC\times0.1</math>
 
{{Plainlist|1=Where:
 
{{Plainlist|1=Where:
 
*''RVC<sub>T</sub>'' is the Runoff volume control target (mm),
 
*''RVC<sub>T</sub>'' is the Runoff volume control target (mm),
−
* ''A<sub>c</sub>'' is the catchment area (Ha), and
+
*''A<sub>c</sub>'' is the catchment area (Ha),
 +
*''C'' is the runoff coefficient of the catchment area, and
 
* 0.095 is the product of a typical runoff coefficient for impermeable surfaces (0.95) and the units correction between m<sup>3</sup> and mm.Ha. (0.1)}}
 
* 0.095 is the product of a typical runoff coefficient for impermeable surfaces (0.95) and the units correction between m<sup>3</sup> and mm.Ha. (0.1)}}
 
* Step 8. Divide required storage (m<sup>3</sup>) by the 1 dimensional storage (in m) to find the required footprint area (A_p) for the bioretention in m<sup>2</sup>.  
 
* Step 8. Divide required storage (m<sup>3</sup>) by the 1 dimensional storage (in m) to find the required footprint area (A_p) for the bioretention in m<sup>2</sup>.  

Revision as of 14:13, 20 February 2018

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 Typical 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 aggregates
 75 ± 25 mm
Biofiler media 0.3
  • 300 mm to support turf grass and accept only roof runoff
  • 600 mm to support flowering perennials and decorative grasses
  • 1000 mm to support trees
Choker course 0.4 typical 100 mm
Embedding reservoir 0.4 Is equal to underdrain pipe diameter Not applicable
Storage reservoir 0.4 See below See below


Calculate the maximum overall depth[edit]

  • Step 1: Determine what the planting needs are and assign appropriate depth of media.
  • Step 2: Decide on the underdrain pipe diameter.
  • Step 3: Determine maximum possible storage reservoir depth beneath the pipe (dS):

Where:

  • f' = Design infiltration rate in mm/hr, and
  • 38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4

Additional step for system without underdrain[edit]

  • Step 4: Determine maximum permissible ponding depth (dP):

Where:

  • f' = Design infiltration rate in mm/hr, and
  • 19.2 comes from multiplying desired drainage time of 48 hours by void ratio of 0.4. Note that conceptually the drainage of the ponded area is limited by ex-filtration at the base of the practice.
  • Step 5: Sum total depth of bioretention and compare to available space above water table and bedrock. Adjust if necesary.

Calculate the remaining dimensions[edit]

  • Step 6: Multiply the depth of each separate component by the void ratio and then sum the total to find the 1 dimensional storage (in mm).
  • Step 7: Calculate the required total storage (m3):

Failed to parse (unknown function "\timesC"): {\displaystyle Storage=RVC_T\times A_c\timesC\times0.1}

Where:

  • RVCT is the Runoff volume control target (mm),
  • Ac is the catchment area (Ha),
  • C is the runoff coefficient of the catchment area, and
  • 0.095 is the product of a typical runoff coefficient for impermeable surfaces (0.95) and the units correction between m3 and mm.Ha. (0.1)
  • Step 8. Divide required storage (m3) by the 1 dimensional storage (in m) to find the required footprint area (A_p) for the bioretention in m2.
  • Step 9. Calculate the peak flow rate (Qp, in L/s) through the filter media:

Where:

  • Ksat is the saturated hydraulic conductivity of the filter media (mm/hr), and
  • Ap is the area of the practice (m2).



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Wishlist[edit]

  • Extension:Scribunto
To enable the use of:
    • Module:Clade
    • Module:Weather box
  • Mobile FrontEnd

Stuff I've done[edit]

  • Restrict account creation
  • pdf Handler
  • Multimedia viewer
  • YouTube
  • Google analytics

Test stuff[edit]

  • Textey text

  • Captiony caption

  • Wordsy words

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

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TTT.png


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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 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.

The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

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.

The rate at which stormwater percolates into the subsoil measured in inches per hour.

The period between the maximum water level and the minimum level (dry weather or antecedent level).

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)

The technique of removing pollutants from runoff as it infiltrates through the soil.

The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.

Subsurface water level which is defined by the level below which all the spaces in the soil are filled with water; The entire region below the water table is called the saturated zone.

The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.

Water from rain, snow melt, or irrigation that flows over the land surface.

The land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale.

The engineered soil component of bioretention cell or dry swale designs, typically with a high rate of infiltration and designed to retain contaminants through filtration and adsorption to particles.

A parameter that describes the capability of a medium to transmit water.

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