The loss node describes the amount of water that is lost from a point in the stream network. Losses may include physical processes such as transmission losses due to evaporation and seepage, or may be used to represent losses associated with measurement error in the data used to develop the model, such as flow-measurement uncertainty.
Scale
Losses are implemented at the site-scale.
Principal developer
eWater
Scientific provenance
Introduced in RiverManager.
Version
Source version 4.3
Dependencies
The loss node must be part of a node link network.
Availability
Loss is automatically installed with Source.
Structure and processes
A loss is specified relative to the flow at that point in the system using a monotonically increasing piecewise linear function.
Input data
The input data for the Loss model is a relationship between inflow and loss from a point in the network. The data entered into the table or configured in a .csv file must be in increasing order and the increase in loss must be less then the increase in inflow. Seasonal variation can be specified using a monthly pattern table, and you can choose to interpolate or step change (default).
Parameters or settings
Model parameters are summarised in Table 1.
Table 1. File format for a piecewise linear function configured as a .CSV file
Row | Column 1 | Column 2 |
|---|---|---|
1 | "Inflow (ML/d)" | "Loss (ML/d)" |
2 | 0 | 0 |
3..n | numeric value | numeric value |
Output data
The loss node outputs a time series of flow.