How is ventilation depicted on mine maps?

Ventilation is depicted on mine maps primarily by the use of arrows indicating the direction of airflow. This visualization is essential for understanding how air moves through the mine, ensuring that fresh air reaches different areas while helping to manage hazardous gases and maintain safe working conditions.

Using arrows allows for a clear representation of both the flow direction and the layout of ventilation systems. It helps miners and foremen quickly ascertain how ventilation is routed, identify possible blockages or inefficiencies, and make informed decisions regarding air quality management.

Other methods like shaded areas to represent airflow or numeric values for air quality provide different information but do not convey airflow direction as explicitly as arrows do. Color coding based on air volume may help to visualize pressure differences or volume capacity, but again, the primary need is to identify airflow patterns, which is best served by directional arrows.