Design tips
Tip 1 – Check rainwater tank performance over time with a daily time step tank volume graph
The Water tank performance over time graph provides a quick visual guide as to whether the roof catchment area, connected rainwater uses (demand) and the retention/detention tank storage volume combination provides the desired design performance, e.g. flood management, rainwater harvesting and reuse and therefore represents good value for money.
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Good retention/detention tank performance In the tool you can drag the curser over a section of the graph to zoom in and view the weekly average water tank performance
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Poor retention/detention tank performance The tank is performing poorly as a downstream flooding prevention device, a sit is usually overflowing.
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To improve performance – increase tank water demand (uses inside the home, preferably) and/or increase tank size to reduce overflow.
Have a look at our InSite Water Tool web page to find out more.
Tip 2 - How to model detention in the InSite Water Tool
Did you know there are two ways to model detention storage using the InSite Water tool?
Example | 6 townhouses
METHOD 1. Detention storage associated with direct rainwater runoff from roofs.
AND/OR
If this does not provide enough detention for the site, the results will indicate the additional storage requirements.
METHOD 2: Detention storage associated with combined roof and surface runoff
Updated results with additional detention storage
