What should vent openings on reservoirs and clearwells be?

The correct choice is for vent openings on reservoirs and clearwells to be screened. Screening vent openings is essential for ensuring that any air exchange can occur while preventing the entry of contaminants, such as dirt, insects, and debris, into the water supply. This is critical for maintaining the quality of water in storage facilities. Proper screening allows for ventilation, which helps to prevent the buildup of harmful gases or vapors while safeguarding the water from potential sources of pollution.

While open vents could theoretically allow for proper aeration, they also pose a risk by exposing the water to environmental contaminants. Sealing the vents would obstruct necessary airflow, leading to potential pressure imbalances and issues related to aeration. Covering with mesh could provide some protection but may not be as effective as proper screening systems designed specifically to ensure adequate airflow while filtering out unwanted particulates. Therefore, screening is the best practice for ensuring both functionality and safety.