Difference between revisions of "Rainwater harvesting: TTT"
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{|class="wikitable" | {|class="wikitable" | ||
| − | |+A RWH cistern as a storage element | + | |+A RWH cistern as a storage element (key parameters) |
|- | |- | ||
!colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage | !colspan = "2" style="background: darkcyan; color: white; align = center"|Stage Storage | ||
| + | |- | ||
| + | |Name||Important to have a unique name, to associate with the subcatchment (harvesting area) | ||
|- | |- | ||
|Storage type||No removal | |Storage type||No removal | ||
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|Catchment||In many scenarios this will be the roof area, delineated on the map as a 'subcatchment'. | |Catchment||In many scenarios this will be the roof area, delineated on the map as a 'subcatchment'. | ||
|- | |- | ||
| − | | | + | |Lined/unlined||Lined |
|- | |- | ||
|Underlying soil||''Any:This doesn't matter for RWH cistern systems'' | |Underlying soil||''Any:This doesn't matter for RWH cistern systems'' | ||
| Line 44: | Line 46: | ||
|Initial soil moisture deficit (fraction)||0 | |Initial soil moisture deficit (fraction)||0 | ||
|- | |- | ||
| − | |colspan = 2|The dimensions of the rainwater cistern can be placed into the fields: | + | !colspan = "2" style="background: darkcyan; color: white; align = center"|Curves |
| + | |colspan = 2|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. Instead, the dimensions of the rainwater cistern can be placed into the fields: | ||
#Bottom elevation (m) | #Bottom elevation (m) | ||
#Maximum depth (m) | #Maximum depth (m) | ||
#Initial water depth (m) | #Initial water depth (m) | ||
| − | |||
|} | |} | ||
[[category:modeling]] | [[category:modeling]] | ||
Revision as of 15:03, 18 September 2017
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:
- Create a subcatchment area to harvest rainwater. Maybe this is a one or more building rooftops?
- Select 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).
- Select the Storage button and place it nearby to the associated catchment.
| Land Use | |
|---|---|
| Roof (%) | 100 |
| Subcatchment | |
| Outlet | Select the name of your RWH cistern storage element (see below) |
| Stage Storage | |||
|---|---|---|---|
| Name | Important to have a unique name, to associate with the subcatchment (harvesting area) | ||
| Storage type | No removal | ||
| Catchment | In many scenarios this will be the roof area, delineated on the map as a 'subcatchment'. | ||
| Lined/unlined | Lined | ||
| Underlying soil | Any:This doesn't matter for RWH cistern systems | ||
| Evaporation factor | 0 | ||
| Suction head (mm) | 0 | ||
| Saturated conductivity (mm/hr) | 0 | ||
| Initial soil moisture deficit (fraction) | 0 | ||
| Curves | 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 (m2) will remain the same throughout the depth. Instead, the dimensions of the rainwater cistern can be placed into the fields:
| ||