In drainage systems, what is the term for water that is not immediately discharged?

The term for water that is not immediately discharged in drainage systems is retained water or standing water. This type of water accumulates in pipes or in other areas of the drainage system where it does not flow or move towards the intended disposal point. Standing water can become a concern, as it may lead to stagnation, create an environment conducive to bacteria growth, and even result in blockages or overflows if not properly managed.

In drainage systems, effective water management is crucial to ensure that the flow is uninterrupted and that all waste and excess water are properly transported away from buildings and other structures. Understanding this concept is essential for maintaining proper drainage practices and ensuring that all aspects of a plumbing system function effectively.