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The implementation of the Irrigator Demand Model as a rainfall-runoff model was undertaken by eWater Ltd.
Scientific Provenance
See See Irrigator Demand Model - SRG
Version
Source v2.10
Rainfall Runoff Library v1.0.5, June 25, 2004
http://www.toolkit.net.au/Tools/RRLversion 4.2.1 and higher
Dependencies
None.
Availability
Automatically provided with Source. SMARG is also available through the Rainfall Runoff Library (RRL) through http://www.toolkit.net.au/Tools/RRL.
Theory
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The Agricultural Runoff rainfallRainfall-runoff Runoff model allows the user to implement the functionality of the Irrigator Demand Model as a rainfall-runoff model at the Functional Unit level. It is used to represent rain fed cropping areas in sub-catchments which are rain-fed and not part of a command area which receives water from a dam (regulated irrigation). Return flows are added to the sub-catchment outflow, not directly to the river. . With some additions and exceptions, the same theory and assumptions underpinning the Irrigator Demand Model are also relevant to the rainfall-runoff model version. Beyond the parameters which are set up in the Rainfall-Runoff table, the Agricultural Rainfall-Runoff model is configured with the same options as those of the Irrigator Demand Model options. The Feature Editor column in the Rainfall-Runoff Model table is used to access and configure these.
Also available is the option to add flow routing to return flows, to represent the function of routing parameters in standard rainfall-runoff models.
SCALE
DEVELOPER
SCIENTIFIC PROVENANCE
Functional unit area should be equal to the maximum irrigated area plus any undeveloped area.. The flow routing model parameters Ts, Tq and Vs use the same algorithms as the Ts, Tq and SFI parameters in the IHACRES Rainfall Runoff Model.
There are four model parameters which are available for calibration and are set up in the main Rainfall Runoff (RR) Model table interface.
Agricultural Runoff Model parameters: Use algorithms for Ts, Tq and SFI parameters in Ihacres
Parameter | Description | Units | Default | Min | Max |
Ts | Time constant governing the rate of recession of slow flow (Ts > Tq) | Time step | 10 | 1 | 100 |
Tq | Time constant governing the rate of recession of quick flow | Time step | 1 | 1 | 10 |
Vs | Proportion of slow flow to total flow | % | 0.5 | 0 | 1 |
| Soil Moisture Capacity | % | 0 |
Flow routing:
The model parameters Ts, Tq and Vs use the same algorithms as the Ts, Tq and SFI parameters, respectively, in the IHACRES Rainfall Runoff Model.
Beyond the parameters which are set up in the RR table, the Agricultural Rainfall-Runoff model is configured with the same options as those of the Irrigator Demand Model options. The Feature Editor column in the Rainfall Runoff Model table is used to access and configure these.
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Additions
The relevant Functional Unit area should be equal to the maximum irrigated area plus any undeveloped area.
Exceptions
Soil moisture capacity is entered as a parameter in the Rainfall-Runoff Model table, and has been deactivated at the Irrigator Demand Model interface.
Return flows are added to the sub-catchment outflow, not directly to the river.
Features not available or relevant at the Functional Unit level include:
- ordering
- account sharing
- opportunistic water
- forecasting
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