In addition to these mandatory keywords on the CO pathway, the user may select optional keywords to specify that elevated terrain heights will be used (the default is flat terrain), to allow the use of receptor heights above ground‑level for flagpole receptors, to specify a decay coefficient or a half‑life for exponential decay, and to generate an input file containing events for processing with the EVENT model. The user also has the option of having the model periodically save the results to a file for later re‑starting in the event of a power failure or other interruption of the model's execution. These options are described in more detail in Section 3 of this volume.
2.4.3 Specifying Source Inputs ‑ SO Pathway
Besides the STARTING and FINISHED keywords that are mandatory for all pathways, the Source pathway has the following mandatory keywords:
LOCATION ‑ Identifies a particular source ID and specifies the source type and location of that source.
SRCPARAM ‑ Specifies the source parameters for a particular source ID identified by a previous LOCATION card.
SRCGROUP ‑ Specifies how sources will be grouped for calculational purposes. There is always at least one group, even though it may be the group of ALL sources and even if there is only one source.
Since the hypothetical source in our example problem is influenced by a nearby building, we also need to include the optional keywords BUILDHGT and BUILDWID in our input file.
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APLICACIONES castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD