Step 1: Understanding the Concept:
The question asks to identify the type of sprinkler head most commonly used for irrigating turf areas like lawns and gardens. The design of these sprinklers needs to be effective for watering grass while being unobtrusive and safe when not in use.
Step 2: Detailed Explanation:
Let's analyze the different sprinkler types and their applications:
(A) Rotating type (e.g., Impact or Gear-driven rotors): These sprinklers rotate to cover a large circular or part-circle area. While they are used for lawns, especially large ones, "pop-up" is a more specific and characteristic feature of lawn sprinklers.
(B) Pop-up type: This describes a sprinkler body that is installed flush with the ground. When the water pressure is turned on, the internal riser containing the nozzle "pops up" above the grass to spray water. When the pressure is turned off, the riser retracts back into the body, disappearing from view. This design is extremely common for lawns and gardens because:
It is aesthetically pleasing as the sprinklers are hidden when not in use.
It is safe, as there are no permanent obstacles above the ground for people to trip over.
It allows for easy mowing of the lawn without damaging the sprinklers.
Pop-up sprinklers can have either rotating nozzles (rotors) for large areas or fixed spray nozzles for smaller, irregular areas. The "pop-up" feature is the key characteristic for this application.
(C) Perforated pipe system: This is a simple system of pipes with small holes drilled in them. It provides a line of spray but offers very poor water distribution uniformity and is not commonly used for quality lawns.
(D) Pendent sprinkler: This is a type of sprinkler used in indoor fire suppression systems. It is designed to hang down from the ceiling piping. It is not used for irrigation.
Step 3: Final Answer:
Pop-up type sprinkler heads are the most common and suitable choice for irrigating small lawns and gardens due to their safety, convenience, and aesthetic advantages. Therefore, option (B) is the correct answer.