TCFP Plans Examiner Practice Test

What is the required pipe slope for wastewater piping?

1. 1/8 in per foot

2. 1/4 in per foot

3. 1/16-1/4 in per foot

4. 1/2 in per foot

The correct answer is: 1/16-1/4 in per foot

The correct answer indicates that the required slope for wastewater piping can range from 1/16 inch to 1/4 inch per foot. This specific slope range is designed to ensure proper drainage and flow within the piping system. A slope that is too steep could lead to excessive flow velocity, which might cause issues like erosion of the pipe material or blockage due to solids being carried too quickly and settling down the line. Conversely, a slope that is too shallow may not allow sufficient flow, leading to stagnation and potential backup issues. This range of slope supports efficient wastewater transport by providing a balance between adequate flow velocity and preventing sediment buildup. It is vital in ensuring that the gravity-driven system operates smoothly and minimizes maintenance requirements. The importance of conforming to this standard is reflected in various plumbing codes, which outline these requirements to promote the longevity and functionality of wastewater systems.