What information might be lost if only a vicinity map is used?

When using only a vicinity map for planning or evaluating a site for a septic system installation, specific and crucial information such as elevation data may be overlooked. Vicinity maps typically provide a broad overview of relationships between geographic locations and are designed to show the general location of the site in relation to surrounding areas without delving into finer details.

Elevation data, which includes information on the slope and grade of the land, is vital for understanding water drainage patterns and ensuring that the septic system is installed in a way that complies with regulations and works effectively. If this information is not considered, there can be significant implications for the system's performance and legality, potentially leading to environmental issues or violations of installation standards.

Detailed terrain features or land use patterns can sometimes be included on higher-resolution maps, but a vicinity map usually lacks the granularity required to provide comprehensive terrain analysis or land usage specifics. Major highways and roads are typically highlighted on vicinity maps, so that information would not be lost. Hence, elevation data stands out as the critical piece of information that can be missed when relying solely on a vicinity map.