This guide covers the use of a groundwater flow modeling code to
simulate the movement of air in the subsurface. This approximation
is possible because the form of the groundwater flow equations are
similar in form to airflow equations. Approximate methods are
presented that allow the variables in the airflow equations to be
replaced with equivalent terms in the groundwater flow equations.
The model output is then transformed back to airflow terms.
This guide illustrates the major steps to take in developing an
airflow model using an existing groundwater flow modeling code.
This guide does not recommend the use of a particular model code.
Most groundwater flow modeling codes can be utilized, because the
techniques described in this guide require modification to model
input and not to the code.
This guide is not intended to be all inclusive. Other similar
techniques may be applicable to airflow modeling, as well as more
complex variably saturated groundwater flow modeling codes. This
guide does not preclude the use of other techniques, but presents
techniques that can be easily applied using existing groundwater
flow modeling codes.
This guide is one of a series of standards on groundwater model
applications, including Guides D5447 and D5490. This guide should
be used in conjunction with Guide D5447. Other standards have been
prepared on environmental modeling, such as Practice E978.
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
This guide offers an organized collection of information or
a series of options and does not recommend a specific course of
action. This document cannot replace education or experience and
should be used in conjunction with professional judgment. Not all
aspects of this guide may be applicable in all circumstances. This
ASTM standard is not intended to represent or replace the standard
of care by which the adequacy of a given professional service must
be judged, nor should this document be applied without
consideration of a project's many unique aspects. The word
"Standard" in the title of this document means only that the
document has been approved through the ASTM consensus
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