- Certified Irrigation Technician System Installation and Layout Flashcards

When boring under a sidewalk or driveway to install an irrigation pipe, the preferred tool for a 1-inch pipe is:

Answer: A water-powered boring tool (water jet) or mechanical boring rod that creates a pilot hole under the hardscape

A boring tool — either water-powered (uses water pressure to wash soil away) or mechanical (a rod driven through the soil) — creates a clean tunnel under the hardscape without disturbing the surface. The irrigation pipe or sleeve is then pulled or pushed through the bore hole.

What is the recommended minimum separation distance between an irrigation trench and a building foundation?

Answer: 12-24 inches, and the trench should not undermine the foundation footing

Irrigation trenches should maintain a minimum of 12-24 inches from building foundations to avoid undermining the footing. Trenching too close to a foundation can weaken the supporting soil and create a path for water to flow against the foundation, potentially causing settling or water intrusion.

A 'point of connection' (POC) in irrigation design refers to:

Answer: The location where the irrigation system connects to the water supply, typically at or after the water meter

The point of connection is where the irrigation system taps into the water supply — typically after the water meter on the domestic water line. This is where static pressure and available flow are measured, and it determines the maximum capacity of the irrigation system.

When gluing PVC pipe, the solvent cement creates a joint by:

Answer: Chemically dissolving (melting) the PVC surfaces so they fuse together when the solvent evaporates

PVC solvent cement is not a glue — it is a chemical solvent that dissolves the surface of both the pipe and fitting. When the dissolved surfaces are pressed together and the solvent evaporates, the PVC molecules intermingle and re-solidify into a single fused joint.

What is the purpose of installing a valve box (rectangular green or purple lid) over each zone valve or valve manifold?

Answer: To provide access for maintenance, repair, and manual operation while protecting the valve and connections from damage and soil intrusion

Valve boxes provide a removable access point to buried valves and manifolds, allowing technicians to maintain, repair, or manually operate valves without excavation. They also protect valve components from soil compaction, root intrusion, and accidental damage.

During layout, a sprinkler head must be positioned at or near every:

Answer: Corner and edge of the irrigated area, with additional heads spaced at head-to-head distances within the area

Sprinkler layout starts by placing heads at all corners and along all edges of the irrigated area, then filling in the interior with heads at head-to-head spacing. Corners and edges are where coverage is most difficult to achieve, so they are the priority positions.