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Subsections

- identification
- physico-chemical properties
- partitioning
- degradation
- sewage treatment removal
- in-stream removal
- market information

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New Substance

This item is only enabled if there is an active scenario, because a substance must be connected to a scenario. The substance dialog is raised and you can specify the substance data.

As GREAT-ER uses the Monte-Carlo method to drive a stochastic simulation, a distribution can be specified for most of the parameters. Depending on the selected distribution, various descriptive values have to be entered. Conversely, switching back from a distribution to a fixed value, GREAT-ER calculates the mean of the former distribution as its first guess.

The substance dialog is separated into seven cards:

#### identification

You can specify the substance name, CAS and EINECS number and additional synonyms to ease identification. The substance name is essential, the other parameters are optional. It is not possible to leave the substance dialog with "OK" (i.e. to use the entered data) without specifying a substance name. The only possibility would be to abort by "Cancel". For each parameter a comment can be entered. Obviously, none can be distributed.

#### physico-chemical properties

General physico-chemical properties can be edited on this card. More process-specific physico-chemical parameters are placed on the related cards.

#### partitioning

The necessity of declaring partitioning coefficients depends on the selected model (Section 3.4.1).

#### degradation

The degradation card covers some very specific parameters for biodegradation and Monod kinetics. See the model description for a more detailed explanation of parameters.

#### sewage treatment removal

Depending on the selected models various parameters have to be entered to describe the substance fate in sewer and the different treatment plants.

#### in-stream removal

As with sewage treatment removal, more or less detailed elimination rates have to be entered, depending on the selected mode for the river submodel

#### market information

You can specify a default consumption (kg per capita and year) of the substance assumed for any discharge site in the simulation area. See Edit Market Data (Section 3.3.4) to edit more site-specific data.

Cancelling the dialog will cause you to return to the previous state. Otherwise confirm the new substance by selecting "OK". The substance is then added to the active scenario. If the previous substance of the scenario has been modified, a confirmation dialog will appear. If there is an open scenario with a substance that has the same ID, a hint will be prompted.

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