What is the name of the mapped record that provides an overall, low-detail picture of the entire distribution system?

The correct choice identifies a mapped record that offers a broad, low-detail overview of the entire distribution system. This type of map is critical for understanding the overall layout, general flow of water, and key components of the system without delving into the specifics.

Comprehensive maps serve as valuable tools for planning, maintenance, and management of water distribution systems, allowing operators to quickly assess the infrastructure at a glance. They provide essential context for more detailed maps, which focus on specific areas or components and include intricate details such as pipe sizes, material types, and specific valve locations.

In contrast, sectional maps and detailed layouts focus on more specific sections or components of a system, providing higher levels of detail that are not typically featured in a comprehensive overview. The distribution overview term may imply a similar concept but is not widely recognized as the specific terminology used in water distribution planning and mapping. Therefore, the term "comprehensive map" is the most appropriate choice.