North Carolina Building Contractor License Practice Exam

A sand-filled vertical drain for a crowned football field must be at least how many inches deep?

1. 5

2. 6

3. 7

4. 8

The correct answer is: 7

The requirement for a sand-filled vertical drain in a crowned football field to be at least seven inches deep ensures effective drainage and functionality. In sports field construction, proper drainage is crucial to prevent water accumulation, which can lead to field damage and playability issues. A minimum depth of seven inches allows for sufficient sand volume, which effectively filters and drains excess water while giving enough space for the vertical drain to operate correctly. This depth is also advantageous in facilitating water movement away from the playing surface, thus maintaining the integrity of the field’s turf and soil composition. Adequate depth helps establish a proper gradient, allowing gravity to assist in water removal and ensuring the field remains safe and playable after rainfall. By adhering to this minimum depth requirement, contractors can ensure that the field maintains its crown shape and that the drainage system works as intended.