Water Re-use from Treatment nodes

Owned by Geoff Davis
Last updated: 05 Jun 2020 by Mukta Sapkota

There is an option to re-use water from any treatment node that has a permanent pool volume, plus the infiltration system node, by specifying a demand:

The Max Drawdown height specifies the water level allowed for re-use, starting from the top. For example:

  • If re-use has been setup at a node and if Max Drawdown = depth of the system, then the water can be empties from the node, ie. water level reaches the bottom of the tank; or
  • If re-use has been setup at a node and Max Drawdown = 0, then the water level is not allowed to move at all (in this case, re-use cannot be supplied).

This is shown in the diagram below:

The demand can be distributed using the following options:

  • Defined as an annual demand and scaled according to the daily Potential Evapotranspiration data contained in the Meteorological Template used to create the model;
  • Defined as an annual demand and scaled according to the daily PET value minus the daily rainfall data contained in the Meteorological Template used to create the model rainfall (i.e. when PET exceeds rainfall, reuse will occur);
  • Defined as a daily demand;
  • Defined as annual demand and scaled according to a user defined distribution; or
  • Defined through the use of a user defined time series.

To enter a user defined timer series,  click on the Browse button, to locate a previously prepared comma separated value (CSV) file which contains the reuse rate (in volume per time-step). The re-use file must be a CSV file with a separate reuse value on each line. Only a single column of data should be provided in the CSV file. A header row needs to be incorporated.

Demand will only be met when there is available storage in the permanent pool of the treatment node.

User Defined Time Series of Reuse

As discussed above, a user defined time series of reuse can be specified in music using Custom Demand Tab and importing data. This facility provides a more realistic reuse demand specification capability. The facility also allows exploration of the impacts of reuse that could not previously be simulated, such as trends in household demand, steps in demand as occupancy changes, etc.