Should plants with single basins be capable of draining in 12 hours?

The statement is based on design and operational requirements for wastewater treatment facilities, particularly focusing on the drainage capabilities of treatment basins. Single basin systems generally need sufficient time for settling and treatment processes to occur effectively. If a basin drains too quickly, it can disrupt these processes, leading to inadequate treatment of the water.

A typical guideline suggests that basins should have a drainage period that allows for the thorough processing of water, which often exceeds a 12-hour timeframe. The requirement for proper hydraulic retention time is crucial in ensuring that biological treatment processes, sedimentation, or any other treatment mechanisms are effective.

Choosing "B. False" aligns with the understanding that while basins should efficiently manage inflow and retention, they usually require more than 12 hours to drain. Instead, the time needed often depends on the size of the basin, the volume of influent, and the treatment goals.

In contrast, other options reflect narrower scenarios that may not universally apply or emphasize conditions that are not standard practice, which is why they do not accurately capture the general operational requirement for single basins.