What is the minimum distance structures should be laid above an underground drainage conduit?

The minimum distance structures should be laid above an underground drainage conduit is determined primarily to ensure structural integrity and prevent any potential settlement or damage to both the structures and the drainage system. A distance of 1.0 m is generally considered acceptable because it provides a sufficient buffer zone that helps to mitigate the risk of load transfer from the structure to the conduit. This distance helps to ensure that the weight of any building or road does not compress or otherwise adversely affect the drainage system, which could lead to failures or blockages.

Additionally, maintaining this distance allows for proper maintenance access to the drainage system. If a structure were built too close, accessing the drainage conduit for repairs or maintenance would be cumbersome, leading to further complications. The 1.0 m specification balances safety, structural engineering considerations, and practical maintenance needs. Thus, it is recognized as a standard guideline within civil engineering to safeguard the integrity of both structures and underground utilities.