New York City Master Plumbers Practice Exam 2025 - Free Plumber License Practice Questions and Study Guide

When installing drainage systems, it is crucial to continuously measure the slope of the lines. The slope, or pitch, of the pipes is vital for ensuring proper drainage and the gravity flow of wastewater. If the slope is not correctly maintained, it can lead to issues such as slow drainage, clogging, or even backups, which can result in costly repairs and potential health hazards.

The slope should typically be a specific gradient, allowing water to flow easily without pooling or stagnating in the pipes. Proper slope not only helps in the efficient functioning of the drainage system but also complies with local plumbing codes and standards.

In contrast, while the length of the pipes, pressure levels, and water temperature may be important under certain circumstances, they do not have the same direct impact on the performance of a drainage system as the slope does. Thus, focusing on measuring the slope ensures that the installation meets the necessary functional and regulatory requirements for effective drainage.