Which testing method is not recommended for identifying inflow and infiltration for manholes?

The air/water test is not the recommended method for identifying inflow and infiltration for manholes due to its limitations in accurately assessing the integrity of the manhole structure. This method can sometimes lead to misleading results since it may not effectively detect all types of leaks or imperfections in the manhole.

Conversely, pneumatic and vacuum tests are often favored because they apply pressure to the manhole structure, allowing for a more comprehensive evaluation of potential leaks. Hydraulic tests can also be useful in determining the infiltration rates by assessing how quickly water enters the system under certain conditions. Due to these aspects, reliance on the air/water test for manhole assessments can result in incomplete data regarding inflow and infiltration issues.