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− | [[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]] | + | {{Clickable button|[[File:TTT.png|350 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]] |
| | | |
− | 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 could be integrated into a site plan using STEP's Treatment Train Tool. This tool provides a graphical user interface and simplified inputs on the EPA SWMM model. It is free to download, click image above. | + | Once the size of cistern has been determined, it can easily be modeled in many open source and proprietary applications. |
− | In a typical configuration:
| + | For planning purposes, a RWH system can be integrated into a site plan as a storage element, using the TTT: |
− | *The catchment (roof) would be 100% impervious
| + | |
− | *The rainwater harvesting system would be a 'Storage' Element with the following properties:
| + | #Create a subcatchment area to harvest rainwater. Maybe this is a one or more building rooftops? |
− | **Storage type = No removal
| + | #:Select the subcatchment button and draw over the desired catchment area, close the are with a double click. |
− | **Lined
| + | #Specify the RWH cistern as the outlet for the subcatchment(s). |
− | **Underlying soil = <em>doesn't matter, can ignore</em>
| + | #:Select the Storage button and place it nearby to the associated catchment. |
− | **Evaporation factor = 0
| + | |
− | **Suction head (mm) = 0
| + | {|class="wikitable" |
− | **Saturated conductivity (mm/hr) = 0
| + | |+A roof as a subcatchment (key parameters) |
− | **Initial soil moisture deficit (fraction) = 0
| + | |- |
− | *The dimensions of the rainwater cistern can be placed into the fields:
| + | !colspan = "2" align = center|Land Use |
− | #Bottom elevation (m)
| + | |- |
− | #Maximum depth (m)
| + | |Roof (%) ||100 |
− | #Initial water depth (m)
| + | |- |
− | #The Curves table is designed to accommodate ponds of roughly conical dimensions. A rainwater cistern is usually cuboid or cylindrical in shape, so that the area (m<sup>2</sup>) will remain the same throughout the depth.
| + | !colspan = "2" align = center|Subcatchment |
| + | |- |
| + | |Outlet||Select the name of your RWH cistern storage element (see below) |
| + | |} |
| + | |
| + | {|class="wikitable" |
| + | |+A [[rainwater harvesting]] cistern as a storage element (key parameters) |
| + | |- |
| + | !colspan = "2" align = "center"|Stage Storage |
| + | |- |
| + | |Name||Important to have a unique name, to associate with the subcatchment (harvesting area) |
| + | |- |
| + | |Storage type||No removal |
| + | |- |
| + | |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 |
| + | |- |
| + | |Maximum depth (m)||Height of the RWH cistern |
| + | |- |
| + | |Lined/unlined||Lined |
| + | |- |
| + | |Evaporation factor||0 |
| + | |- |
| + | !colspan = "2" align = "center"|Curves |
| + | |- |
| + | |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. |
| + | |} |
| [[category:modeling]] | | [[category:modeling]] |