What Does Cascade System Mean?
A cascade system in the context of trenchless technology refers to the drain system used in sloping areas. A cascade system can be visualized as a continuous drain pipe with vertical drops at certain intervals to maintain the optimum slope. Cascade drains are simple, economic and easy to construct. A cascade drain system can be of three types: horizontal step, end sills step and inclined step.
The popular cascade system is the horizontal step cascade.
Trenchlesspedia Explains Cascade System
Cascade system is basically used to control and manage the flow of water from an elevated area to downhill. During heavy rainfall, storm water drains are filled to capacity and often over flowing. If not contained within the drain system, flooding can occur and high speed of flowing water can cause damage to the pipeline. Cascade drains are built in such areas where slope conditions and differing ground height is observed to help control the flow of water even during seasons of heavy rainfall.
Sewer pipelines can also be installed using cascade method by installing drop manholes where optimum slope is reached in order to maintain the appropriate flow rate under gravity.