What is the diameter percentage required for deflection tests on flexible or semi-rigid pipes according to TCEQ Design Criteria?

The diameter percentage required for deflection tests on flexible or semi-rigid pipes according to the Texas Commission on Environmental Quality (TCEQ) Design Criteria is 95%. This specification is crucial because it ensures that the pipes maintain appropriate structural integrity during and after installation.

Performing deflection tests is essential to verify that the pipes can withstand the operational conditions they will face once in use. The 95% deflection requirement guarantees that the pipes can maintain their shape and capacity under the weight of the soil and possible traffic loads, helping prevent issues such as blockages and breaks in the future. By ensuring the pipes do not exceed this threshold, it becomes easier to maintain reliable and effective wastewater systems, contributing to better drainage and sewage management overall.

Each of the other percentages would either permit more deformation than desired or be lower than the standards established for durable infrastructure, which could lead to potential failures or reduced lifespan of the piping system.