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You can set an elevation for a link using the Location Control window (.
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4. Location Control window
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| Note: While it is usual to use zero storage as the reference point for the elevation of a link or node, there is no convention for a link as to whether that should be at the start or end of the reach, or some point in between. Source has no mechanism for indicating the fall across a reach. |
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Lagged flow routing only considers the average travel time of water in a river reach. It does not consider flow attenuation The flow entering a link exits that link at some whole number of time-steps in the future. This type of link is represented in the Schematic Editor as a black line, with alternating dots and dashes. Once you have enabled lagged flow routing, double click the link to configure the settings.
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5. Link (Lagged flow routing)
Lag Time represents the time it takes for water to travel along the link and is a positive real number. This can be expressed in various units shown in Figure 4. Initial Storage is the amount of water deemed to be in the link on the first time-step. For example, if there is a lag of two days, and there is 10ML in the link at the start of the run, then 5ML is deemed to be flowing out each day (total initial storage divided by lag).
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x is the inflow bias or attenuation factor.
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6. Prism and wedge storage
Refer to the Source Scientific Reference Guide for more details.
Figure 6 7 shows the parameters required to configure storage routing on a link.
Figure
67. Link (Storage Routing), Generic
You can also specify a piecewise relationship (as shown in Figure 78) instead of a generic one.
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8. Link (Storage routing), Piecewise
About dead storage
Dead storage refers to the capacity of a storage that is below the minimum operating level. At this water level, there is no outflow. The level of the reach with respect to dead storage at the beginning of the time-step affects its level in subsequent time-steps as follows:
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By convention, losses are described using positive numbers whereas gains are specified using negative numbers. In other words, a gain is a negative loss. Note that in the Flow vs Loss/Gain table, flow cannot be negative. Additionally, the values for Loss/Gain Qloss must be increasing (as shown in Figure 89).
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9. Link (Storage routing, Loss/Gain)
You can enter the relationship manually, or import the data from a .CSV file, the format of which is shown in Table 5. This table shows the data file format for both evaporation and rainfall.
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Choose Evaporation to specify the rate of evaporation per unit of surface area. Typically, this is done using a time series, the format of which is shown in Table 5. You can also specify the rate of evaporation using an expression, or by reference to the output of another scenario. By default, expressions return units in millimetres per day but you can change this in the Expression Editor if required.
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10. Link (Evaporation)
Rainfall on link surfaces
To specify the rate of precipitation per unit of surface area, choose Rainfall. This can be done using either a time series (format shown in Table 5) or an expression. A time series can have multiple columns containing rainfall data.
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11. Link (Rainfall)
Timeseries Flux
This allows the input of a time series of total water lost or gained on a link. Values can be positive or negative. A negative value denotes water returned to the link (a gain). See also Link losses and gains.
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12. Link (Timeseries flux)
Constituents
Before you can configure constituents for a link, you must define them first for the scenario using Refer to Links.
Ordering at links
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Figure
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13. Link (Ordering)
Ownership at links
The intention of ownership in links is to define which owner is responsible for fluxes that occur on links. Refer to Figure number for details.14 for details.