When designing a drainage system, why should the topography be considered?

Considering topography when designing a drainage system is crucial because it helps in identifying the natural flow of water across a site. The terrain influences how water moves, where it collects, and the potential for erosion or flooding. By understanding the topographical features – such as slopes, depressions, and elevations – designers can effectively plan the drainage system to work with the landscape, rather than against it. This ensures that water is directed away from structures and into appropriate drainage areas, reducing the risk of water damage and maintaining a functional landscape.

While aesthetic considerations, property value, and sustainability are important elements in overall site design, they do not have the same direct impact on the effectiveness of a drainage system as understanding and utilizing the natural flow of water does. Therefore, recognizing and adapting to the site's topography is fundamental for an effective drainage strategy.