Certified Professional Horticulturist (CPH) Practice Exam

In landscape design, which is a primary purpose of using contouring?

1. To enhance aesthetic appeal

2. To manage water runoff

3. To increase floral diversity

4. To reduce maintenance requirements

The correct answer is: To manage water runoff

Contouring in landscape design primarily serves the purpose of managing water runoff effectively. The process involves shaping the land into contours that follow the natural topography, which can significantly help in directing water flow, reducing soil erosion, and maximizing water absorption in the landscape. When land is contoured, it creates a series of ridges and valleys that slow down the movement of water, allowing it to seep into the soil rather than running off quickly. This is particularly important in preventing water loss, reducing the threat of flooding, and minimizing erosion on slopes. By carefully designing contours, landscape architects can enhance the overall sustainability of a site, contributing to better water management practices. While enhancing aesthetic appeal, increasing floral diversity, and reducing maintenance requirements are beneficial aspects of landscape design, they are secondary to the fundamental purpose of contouring, which is to address water runoff issues. Effective contouring not only provides functional benefits but can also lead to aesthetically pleasing designs and promote healthier plant growth by ensuring soil moisture retention.