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{{Clickable button|[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}
{{Clickable button|[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}
[[File: Sub TTT.png|thumb|Subcatchment element as displayed in the TT menu]]
[[File:Storage TTT.png|thumb|Storage element as displayed in the TTT menu]]
[[File:Storage TTT.png|thumb|Storage element as displayed in the TTT menu]]
Once the size of cistern has been determined, it can easily be modeled in many open source and proprietary applications.
Once the size of cistern has been determined, it can easily be modeled in many open source and proprietary applications.
For planning purposes, a RWH system can be integrated into a site plan as a storage element, using the TTT.
For planning purposes, a RWH system can be integrated into a site plan as a storage element, using the TTT.
#Create subcatchment for harvesting rainwater.
{|class="wikitable"
|-
!colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage
{|class="wikitable"
{|class="wikitable"
|Storage type||No removal
|Storage type||No removal
|-
|-
|Catchment (roof)||100% impervious
|Catchment||In many scenarios this will be the roof area, delineated on the map as a 'subcatchment'.
|-
|-
|?||Lined
|?||Lined
|-
|-
|Underlying soil||<em>Doesn't matter</em>
|Underlying soil||''Any:This doesn't matter for RWH cistern systems''
|-
|-
|Evaporation factor||0
|Evaporation factor||0