CSLB C-27 Landscaping ContractorSite Preparation and DrainageMedium
A landscape contractor is designing a subsurface drainage system for a sports field. The field has a relatively flat grade, and the primary goal is to quickly remove excess surface water while maintaining a playable surface. Which type of pipe material is generally preferred for the main collector lines in such a system due to its durability, flow capacity, and resistance to chemical degradation?
- AClay tile drain pipe.
- BCorrugated High-Density Polyethylene (HDPE) pipe.
- CConcrete drain pipe.
- DPolyvinyl Chloride (PVC) perforated pipe.
Show answer & explanationAnswer & explanation
Correct answer: D. Polyvinyl Chloride (PVC) perforated pipe.
PVC pipe is generally preferred for main collector lines in subsurface drainage systems due to its smooth interior for optimal flow, high durability, resistance to chemical degradation, and strong joints, which are critical for long-term performance in sports fields.
Why the other options are wrong
- A. Clay tile drains are brittle, prone to shifting, and have limited flow capacity, making them largely obsolete for modern sports field drainage.
- B. Corrugated HDPE is flexible and often used for lateral lines or in areas where flexibility is key, but its corrugated interior can impede flow compared to smooth PVC for main lines.
- C. Concrete drain pipes are heavy, difficult to install, and can be susceptible to chemical attack in certain soil conditions, making them less suitable than PVC for this application.
Subsurface Drainage Pipe Materials
Various materials used for pipes in subsurface drainage systems, each with distinct advantages and disadvantages for specific applications.
- PVC is favored for main lines due to smooth flow and durability.
- HDPE is flexible, often used for laterals.
- Clay and concrete pipes are generally less preferred for modern systems.
Memory trick: PVC is the PRIME choice for performance.