Texas Wastewater Class B Practice Exam

The primary causes of stoppage in a collection system include grease and roots due to their pervasive nature and tendency to create blockages. Grease accumulates in pipes over time, forming a sticky substance that attracts other debris, leading to significant clogs. Roots, on the other hand, are drawn to the moisture and nutrients within underground pipes, and as they grow, they can invade and obstruct the flow, exacerbating stoppages. While flooding and debris can impact drainage systems, their occurrence is often situational and not as frequent or primary as the issues presented by grease and roots. Sand and gravel can cause blockages, but they are typically less common than organic matters like grease. Improper construction can lead to functional issues in the system, but they do not serve as primary causes of stoppage in the same way that grease and roots do, which frequently result in immediate and severe blockage problems.