Background
The Farm Dam Plugin was initially developed by Sinclair Knight Merz (SKM) and the Western Australian Department of Water (DoW), with support from the National Water Commission (NWC). Now the functionality of this plugin is moved to the Core of the Source, and the user can directly use its functionality without the farm dam plugin. For each farm dam, the Source conducts a water balance, including inflows, rainfall, evaporation, seepage, water usage (demand), and overflow (spill) components (Figure 1) in each time step. This means that, for each time step (e.g., a day), each water balance component is accounted for in Source for every farm dam modelled. For more information on the initial farm dam models, SKM has produced a series of project reports available upon request from the Department of Water. These reports include:
- User requirements report (SKM, 2012);
- Systems design report for the planning component of the tool (SKM, 2012c);
- Model implementation report (SKM, 2012d); and
- User manual (SKM, 2012e).
The original documentation is copyrighted. The user may download, display, print, and reproduce the material in unaltered formally (retaining this notice) for your personal, non-commercial use or use within your organisation. Apart from any use as permitted under the Copyright Act 1968, all other rights are reserved. Requests and inquiries concerning reproduction and rights should be addressed to The Western Australian Department of Water.
Figure 1 Water balance of a farm dam
Acknowledgments
The Western Australian Department of Water would like to thank SKM for the assistance in the preparation of this document.
Disclaimer
The Western Australian Department of Water has produced the original document. Any representation, statement, opinion or advice expressed or implied in this publication is made in good faith and on the basis that the Western Australian Department of Water and its employees are not liable for any damage or loss whatsoever which may occur as a result of action taken or not taken, as the case may be in respect of any representation, statement, opinion or advice referred to herein. Professional advice should be obtained before applying the information contained in this document to particular circumstances.
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Modelling farm dams in Source using the Onstream Farm Dam node
Create node(s) for
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farm
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dams in
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a Source model
The creation of the a farm dam node (i) in the a river system model from the Schematic editor Editor and (ii) the in a catchment model from the Geographic Editor, is different. The methods for both models are described separately below.:
From the Schematic Editor
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The icon of the green triangle icon 
on the Node Palette represents the onstream farm dam. Dragging the icon from the Node Palette to the Schematic Editor interface can create a farm dam node. The accurate coordinates of farm dams’ positions are not required.
From the Geographic Editor
There are two ways to add the onstream farm to the catchment model from the Geographic Editor
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