8,255
edits
Changes
Jump to navigation
Jump to search
mLine 1:
Line 1: − 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. + + + + + + + + + + − {| class="wikitable"+ − |- − ! 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 − | colspan="2" |75 ± 25 mm − |- − | [[Biofiler media]] − | 0.3 − | colspan="2" | − * 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 gravel|Choker course]] − | 0.4 typical − | colspan="2" |100 mm − |- − | Embedding reservoir − | 0.4 − | Is equal to underdrain pipe diameter − | Not applicable − |- − | Storage reservoir − | 0.4 − | See below − | See below − |} + + + + + − + − *Step 1: Determine what the planting needs are and assign appropriate depth of media, using the table above. + − *Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth. + − *Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s</sub>''):+ − <math>d_{s}=f'\times38.4</math> − − *''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=== − *Step 4: Determine maximum permissible ponding depth (''d<sub>p</sub>''): − <math>d_{p}=f'\times19.2</math> − {{Plainlist|1=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 necessary. − − ==Calculate the remaining dimensions== − * 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>): − <math>Storage=RVC_T\times A_c\times C\times 0.1</math> − {{Plainlist|1=Where: − *''RVC<sub>T</sub>'' is the Runoff volume control target (mm), − *''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)}} − * 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 9. Calculate the peak flow rate (''Q<sub>p</sub>'', in L/s) through the filter media: − <math>Q_{p} = A_{p}\times K_{sat}\times 3.6 \times 10^{-3}</math> − {{Plainlist|1=Where: − *''K<sub>sat</sub>'' is the saturated hydraulic conductivity of the filter media (mm/hr), and − *''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>).}} − − − Line 85:
Line 31: − − {{#widget:YouTube|id=DWef69ItVrU}} − − − Line 102:
Line 43: − − == Wishlist == − *Extension:Scribunto − :To enable the use of: − **Module:Clade − **Module:Weather box − *Mobile FrontEnd − + − + − + − + − + + + + + + − + Line 139:
Line 78: − <div class='tableauPlaceholder' id='viz1508348769899' style='position: relative'><noscript><a href='https://wiki.sustainabletechnologies.ca/index.php/Drawdown_time'><img alt='Dashboard 1 ' src='https://public.tableau.com/static/images/St/StormIntereventTimesOntario/Dashboard1/1_rss.png' style='border: none' /></a></noscript><object class='tableauViz' style='display:none;'><param name='host_url' value='https%3A%2F%2Fpublic.tableau.com%2F' /> <param name='embed_code_version' value='2' /> <param name='site_root' value='' /><param name='name' value='StormIntereventTimesOntario/Dashboard1' /><param name='tabs' value='no' /><param name='toolbar' value='yes' /><param name='static_image' value='https://public.tableau.com/static/images/St/StormIntereventTimesOntario/Dashboard1/1.png' /> <param name='animate_transition' value='yes' /><param name='display_static_image' value='yes' /><param name='display_spinner' value='yes' /><param name='display_overlay' value='yes' /><param name='display_count' value='yes' /><param name='filter' value='publish=yes' /></object></div> <script type='text/javascript'> var divElement = document.getElementById('viz1508348769899'); var vizElement = divElement.getElementsByTagName('object')[0]; vizElement.style.minWidth='420px';vizElement.style.maxWidth='650px';vizElement.style.width='100%';vizElement.style.minHeight='620px';vizElement.style.maxHeight='920px';vizElement.style.height=(divElement.offsetWidth*0.75)+'px'; var scriptElement = document.createElement('script'); scriptElement.src = 'https://public.tableau.com/javascripts/api/viz_v1.js'; vizElement.parentNode.insertBefore(scriptElement, vizElement); </script>+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
→.
{{Widget
|description=Allows you to embed Flickr Search Queries.
|author=Michael Platzer
|provider=Flickr
|providerurl=http://www.flickr.com/
|status=active
|security=unknown
|addedon=October 29, 2009
}}
This widget allows you to embed [http://www.flickr.com/search/?q=flowers&w=all Flickr Search Queries] to your wiki page.
To insert this widget, use the following code:
<nowiki>{{#widget:</nowiki>{{PAGENAME}}<nowiki>
|query=flowers
|width=580
|height=350
}}</nowiki>
==Calculate the maximum overall depth==
== Sample result ==
{{#widget:{{PAGENAME}}
|query=flowers}}
{{Comments}}
{{Plainlist|1=Where:
----
----
{{#l:RWH_DC_TOOL_v.1.4.xlsm|This file will be downloaded when clicked}}
{{#l:RWH_DC_TOOL_v.1.4.xlsm|This file will be downloaded when clicked}}
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque lobortis nibh elit, at pretium ipsum pretium id. Nulla et purus condimentum, laoreet dui at, sollicitudin nisi. Sed tristique ac odio nec venenatis. Nunc quis ante quis urna elementum finibus. Praesent fringilla iaculis tristique. Mauris id felis commodo, elementum lorem vitae, faucibus nibh. Nulla venenatis elit ut odio pharetra vehicula. Aenean et enim mauris. Donec consequat nunc ipsum. Aliquam mattis est purus, a pharetra diam bibendum id. Donec consectetur est ut euismod efficitur. Etiam sed tortor eros. Vivamus non nisi feugiat tortor accumsan vestibulum.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque lobortis nibh elit, at pretium ipsum pretium id. Nulla et purus condimentum, laoreet dui at, sollicitudin nisi. Sed tristique ac odio nec venenatis. Nunc quis ante quis urna elementum finibus. Praesent fringilla iaculis tristique. Mauris id felis commodo, elementum lorem vitae, faucibus nibh. Nulla venenatis elit ut odio pharetra vehicula. Aenean et enim mauris. Donec consequat nunc ipsum. Aliquam mattis est purus, a pharetra diam bibendum id. Donec consectetur est ut euismod efficitur. Etiam sed tortor eros. Vivamus non nisi feugiat tortor accumsan vestibulum.
{{Col-end}}
{{Col-end}}
<!-- Please call pinit.js only once per page -->
<!-- Please call pinit.js only once per page -->
<script type="text/javascript" async src="//assets.pinterest.com/js/pinit.js"></script>}}
<script type="text/javascript" async src="//assets.pinterest.com/js/pinit.js"></script>}}
==Stuff I've done==
==Stuff I've done==
*Restrict account creation
Flow (''Q'') in an open channel, such as a swale, may be calculated using Manning's equation:
*pdf Handler
<math>Q=VA=\frac{R^{\frac{2}{3}}S^{\frac{1}{2}}}{n}</math>
*Multimedia viewer
Where:
*YouTube
<math>R=\frac{A}{P}</math>
*Google analytics
{{Plainlist|1=Where:
*''Q'' = the flow in the swale (m<sup>3</sup>/s)
*''A'' = the cross sectional area of the swale (m<sup>2</sup>)
*''P'' = the wetted perimeter of the swale (m)
*''S'' = the longitudinal slope (m/m)
*''n'' = Manning's coefficient (dimensionless)}}
==Test stuff==
==Test stuff==
<gallery mode=Slideshow>
<gallery mode="packed-overlay">
Swale TTT.png|Textey text
Swale TTT.png|Textey text
LID TTT.png|Captiony caption
LID TTT.png|Captiony caption
{| class="wikitable"
!Permeability
|D<sub>15</sub> Base/D<sub>15</sub> Bedding layer > 5
|-
!Choke
|D<sub>50</sub> Base/D<sub>50</sub> Bedding layer > 25
|-
!Choke
|D<sub>15</sub> Base/D<sub>85</sub> Bedding layer > 5
|}
==.==
{| class="wikitable"
|
!Surface filter
!Underground filter
!Perimeter filter
!Pocket filter
!Organic filter
!Bioretention
|-
!Ultra-urban
|Maybe||Ideal||Yes||Maybe||Maybe||Maybe
|-
!Parking lots
|Ideal||Yes||Ideal||Yes||Yes||Ideal
|-
!Roads
|Maybe||Maybe||Maybe||Maybe||No||Yes
|-
!Residential
|Maybe||Maybe||Maybe||Yes||Maybe||Yes
|-
!Landscaped
|No||No||No||No||Maybe||Ideal
|-
!Rooftop
|Yes||Yes||Yes||Yes||Yes||Yes
|}