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|   | 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:   | 
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| − | #Create subcatchment for harvesting rainwater. 
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|   | + | #Create a subcatchment area to harvest rainwater. Maybe this is a one or more building rooftops?  | 
|   | + | **Click on the subcatchment button and draw over the desired catchment area, close the are with a double click.    | 
|   | + | #Specify the RWH cistern as the outlet for the subcatchment(s).    | 
|   | + | ** Clock on the Storage button and place it nearby to the associated catchment.   | 
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|   | {|class="wikitable"  |   | {|class="wikitable"  | 
|   | + | |+A RWH cistern as a storage element (key parameters)  | 
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| − | !colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage  | + | !colspan = "2" style="background: darkcyan; color: white; align = center"|Land Use  | 
| − |    | + | |-  | 
| − |    | + | |Roof (%) ||100  | 
|   | + | !colspan = "2" style="background: darkcyan; color: white; align = center"|Subcatchment  | 
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|   | + | |Outlet||Select the name of your RWH cistern storage element (see below)   | 
|   | + | }  | 
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|   | {|class="wikitable"  |   | {|class="wikitable"  | 
|   | + | |+A RWH cistern as a storage element  | 
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|   | !colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage  |   | !colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage  |