Certified Storm Water Operator Practice Exam

What negative effect can occur if the slope of a diversion channel is too steep?

1. Erosion

2. Reduced drainage

3. Increased vegetation growth

4. Water accumulation

The correct answer is: Erosion

When the slope of a diversion channel is too steep, erosion is a significant negative effect that can occur. Steeper slopes can increase the velocity of water flow within the channel, which has the potential to dislodge soil particles from the banks and the bottom of the channel. This process can lead to significant soil loss over time, damaging the integrity of the channel itself and potentially contributing to sedimentation downstream, which can affect water quality and aquatic habitats. The fast-moving water may also create a feedback loop, where increased erosion leads to a wider and deeper channel, further exacerbating the problem. In addition to damaging the diversion channel, increased erosion can have broader environmental consequences, including loss of landscape stability, destruction of habitats, and alteration of water flow patterns in nearby ecosystems. Hence, managing the slope of diversion channels is critical to minimizing these erosive effects and maintaining effective stormwater management systems.