What common error might occur during the construction of an overcast?

Making rough and abrupt interruptions to the air current is a common error that can occur during the construction of an overcast. An overcast is designed to maintain a smooth flow of air within a mine, allowing for effective ventilation that is vital for both safety and operational efficiency. If the construction introduces abrupt changes or obstructions in the airflow, it can lead to turbulence, decreased air quality, and inadequate air distribution. This can create hazardous conditions for miners, contributing to the buildup of harmful gases and reducing overall air circulation within the mine. Proper design and construction aim to create a consistent airflow without sudden changes, ensuring a safe working environment.

Other options, while related to operational issues, do not directly pertain to the construction phase of an overcast in terms of airflow management, making them less relevant to the specific question asked.