What is the importance of using graduated sizes of granular material in drainage systems?

Using graduated sizes of granular material in drainage systems is crucial for optimizing flow and reducing clogging. When different sizes of material are used, larger particles create pathways for water to flow, while smaller particles fill in the spaces between them. This arrangement allows for better drainage efficiency because it minimizes the void spaces that could trap finer organic materials or sediments, which often lead to clogging.

In a well-designed drainage system, the graded mix of materials enables water to permeate through effectively while discouraging the accumulation of debris that could obstruct flow. This balance is key in ensuring that the system maintains its intended function over time, providing reliable drainage and preventing water accumulation that could lead to flooding or other issues.

The other aspects, such as reducing costs, enhancing aesthetic appeal, or strengthening structural integrity, may have their own benefits in specific contexts but do not directly relate to the primary purpose of using graduated granular material in promoting effective drainage performance.