4.2 AERMAP DEM ARRAY AND DOMAIN BOUNDARY (09/27/05)

Section 2.1.2 of the AERMAP User’s Guide (EPA, 2004c) states that the DEM array and domain

boundary must include all terrain features that exceed a 10% elevation slope from any given

receptor. The 10% slope rule may lead to excessively large domains in areas with considerable

terrain features (e.g., fjords, successive mountain ranges, etc). In these situations, the reviewing

authority may make a case-by-case determination regarding the domain size needed for

AERMAP to determine the critical dividing streamline height for each receptor.

 

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