CSLB C-27 Landscaping ContractorSite Preparation and DrainageMedium
A landscape contractor is designing a sports field with a subsurface drainage system. The design calls for the use of drain tile (perforated pipe) in a herringbone pattern. What is the primary advantage of using a herringbone pattern for sports field drainage?
- AIt allows for efficient collection of water from a broad area and directs it to a main collector.
- BIt is the most cost-effective pattern for large areas.
- CIt prevents root intrusion into the drain pipes.
- DIt requires less excavation compared to other patterns.
Show answer & explanationAnswer & explanation
Correct answer: A. It allows for efficient collection of water from a broad area and directs it to a main collector.
The herringbone pattern, characterized by lateral drain lines feeding into a central main collector line, is highly effective for sports fields because it maximizes the collection of subsurface water from a wide area and efficiently channels it to a single discharge point, ensuring rapid dewatering.
Why the other options are wrong
- B. Cost-effectiveness depends on many factors, and herringbone can be labor-intensive due to multiple connections.
- C. The pattern itself does not prevent root intrusion; proper pipe material and installation practices are needed for that.
- D. The herringbone pattern typically requires extensive excavation for both lateral and main lines, not less.
Herringbone Drainage Pattern
A subsurface drainage layout characterized by multiple lateral drain lines angled to feed into a central, larger main collector drain, resembling a fish skeleton.
- Efficiently collects water from large areas.
- Commonly used in sports fields and agricultural lands.
- Directs water to a single main discharge point.
Memory trick: Herringbone's wide reach, water's quick beach.