What does the intermittent "blue" dashed line represent?

The intermittent "blue" dashed line represents a seasonal stream. This type of symbol is commonly used on maps to indicate bodies of water that flow only part of the year. Seasonal streams typically flow during periods of heavy rain or snowmelt but may not have water present during dry seasons.

In contrast, a permanent river would be represented by a solid blue line, indicating a constant flow of water throughout the year. A dry riverbed, often denoted in other mapping symbols, specifically indicates areas where water does not flow at any time, while a land boundary would be shown in a distinct manner, usually with solid lines of different colors. Understanding these symbols is crucial for SAR operations, as they provide vital information about the terrain and potential water sources in an area of operation.