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Although similar to a flow boundary condition or withdrawal/return user interfaces, the settings for jet/plume boundary conditions are unique to this boundary condition and associated sub-model (described below). In the Jet/Plume Type drop-down menu the user specifies the flow data of a jet plume boundary to link to with the time series options. These options include by-passing (ICAL=0), using a flow time series (QSER, ICAL=1), using a withdrawal return time series (W/R, ICAL=2). The user may also specify the frequency, in number of time steps, to update the jet/plume calculations.
When using the J/P with W/R time series Series option the user should set the location of the withdrawal and discharge locations as they would for a W/R boundary. However, it should be noted that the vertical layer of setting for the discharge is not used by EFDC, though withdrawal layer setting is used. The This is because J/P boundary automatically distributes the discharge flow from the plume over the vertical layers based on the flow characteristics and ambient temperature.
In the Diffuser Port Settings for Current Cell frame the user may specify the settings for each discharge cell including the number of ports, the elevation and the diameters of the port outlets, as well as the horizontal (azimuth) and vertical (altitude) angles. It should be noted that the flow in the QSER file is multiplied times the number of ports for the total flow for that BC cell. So for example, if a user has 10 ports with each port having a time series of 0.15 cms assigned for the jet, then the total flow is 10 * 0.15 cms = 1.5 cms.
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