Difference between revisions of "Dry ponds: TTT"

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{{Clickable button|[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}
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[[File:Storage TTT.png|thumb|[[Dry ponds]] are found in storage element in the LID TTT]]
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[[File:Storage TTT.png|thumb|[[Dry ponds]] are found in storage element in the LID TTT.]]
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[[File:Pond curves.png|thumb|The largest area is at the top, level 0 m; each subsequent lower depth has a smaller area]]
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{{Clickable button|[[File:TTT.png|350 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}
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Dry ponds are a storage element in the Treatment Train Tool.
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{|class="wikitable"
 
{|class="wikitable"
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|+A [[rainwater harvesting]] cistern as a storage element (key parameters)
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|+A [[Dry ponds|dry pond]] as a storage element (key parameters) in the Treatment Train Tool.
 
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!colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage
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!colspan = "2"|Stage Storage
 
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|Name||Important to have a unique name, to associate with the subcatchment (harvesting area)
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|Name||Important to have a unique name, to connect it with the catchment area
 
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|Storage type||No removal
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|Storage type||Dry detention ponds
 
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|Bottom elevation (m)||This will be 0 for installations at ground level, but will often be underground. This is of greater importance when the overflow is coupled to another component within a treatment train
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|Bottom elevation (m)||This is important to correspond with other components, <br>e.g. when the overflow is coupled to another BMP within a treatment train
 
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|Maximum depth (m)||Height of the RWH cistern
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|Maximum depth (m)||
 
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|Lined/unlined||Lined
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|Lined/unlined||Unlined (ideally)
 
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|Evaporation factor||0
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|Underlying soil||Choose from five; sandy soils drain more quickly.
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|Evaporation factor||?
 
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!colspan = "2" style="background: darkcyan; color: white; align = center"|Curves
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|Suction head (mm)||?
 
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|colspan = 2|The Curves table is designed to accommodate ponds of roughly conical dimensions. Rainwater cistern are usually cuboid or cylindrical in shape, so that the area (m<sup>2</sup>) will remain the same throughout the depth. The top and bottom dimensions can be placed within the first two rows of the table.  
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|Saturated conductivity (mm/hr)||?
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|Initial soil moisture deficit (fraction)||?
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!colspan = "2" align = center"|Curves
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|colspan = 2|The Curves table is designed to accommodate the side slopes. The top line begins at 0 m, with subsequent depths in the following lines.  
 
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Latest revision as of 23:01, 8 November 2017

Dry ponds are found in storage element in the LID TTT
The largest area is at the top, level 0 m; each subsequent lower depth has a smaller area

TTT.png

A dry pond as a storage element (key parameters) in the Treatment Train Tool.
Stage Storage
Name Important to have a unique name, to connect it with the catchment area
Storage type Dry detention ponds
Bottom elevation (m) This is important to correspond with other components,
e.g. when the overflow is coupled to another BMP within a treatment train
Maximum depth (m)
Lined/unlined Unlined (ideally)
Underlying soil Choose from five; sandy soils drain more quickly.
Evaporation factor ?
Suction head (mm) ?
Saturated conductivity (mm/hr) ?
Initial soil moisture deficit (fraction) ?
Curves
The Curves table is designed to accommodate the side slopes. The top line begins at 0 m, with subsequent depths in the following lines.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

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

The temporary storage of stormwater to control discharge rates, and allow for sedimentation.

Best management practice. State of the art methods or techniques used to manage the quantity and improve the quality of wet weather flow. BMPs include: source, conveyance and end-of-pipe controls.

Stormwater management following the hierarchical approach: Source Control measures, Conveyance Control measure and End of Pipe treatment to achieve the water quality and water balance target for lot level development of the preferred strategy.

A combination of lot level, conveyance, and end-of-pipe stormwater management practices.

Abiotic transfer of water vapour to the atmosphere.

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