Specifying the Dimensions and Initial Quantity for a Pool

Within the Properties dialog, two sets of Units must be specified for a Pool A stock element that integrates and conserves flows of materials. A Pool is a more powerful version of a Reservoir (it has additional features to more easily accommodate multiple inflows and outflows). (the Quantity Units and the Flow Units):

The primary output For an element with multiple outputs, the output that has the same name as the element. of a Pool is its Current Value (its Quantity). The Quantity Units determine the dimensions An output attribute for an element that defines the dimensionality (in terms of Length, Time and other fundamental dimensions) of the output. of this output. This output is always a value (it cannot be a condition). Moreover, it can only be a scalar An output consisting of a single value or condition. (and hence, all of the inputs for the element must be scalars).

Note: If you need to model a vector A one-dimensional array. or matrix A two-dimensional array. quantity, you must use a Reservoir A stock element that integrates and conserves flows of materials. element

The Flow Units determine the display units The units (e.g., m, g, $/day) in which an output is displayed within GoldSim. for the Outflow outputs of the element. The dimensions of this output must be the same as those of the Quantity divided by Time. For example, if the Quantity Units have dimensions of Volume, the Flow Units must have dimensions of Volume/Time.

Note: GoldSim encourages (but does not require) you to specify Quantity Units for a Pool whose dimensions are consistent with materials. In particular, it expects the units to have dimensions of mass, volume, energy, amount, currency, or to be dimensionless. When you first specify your Quantity Units, GoldSim will warn you if your units do not have one of these dimensions. GoldSim will not, however, prevent you from using other units.

The Initial Quantity input to the Pool must have the same dimensions at the Quantity Units.

Note: The Initial Quantity must be a number or a link from a static variable (e.g., a constant Data element An input element intended to represent constant inputs in a model. or a Stochastic).