Which of the following impacts the efficiency of a sprinkler system?

The efficiency of a sprinkler system is significantly impacted by the length of distribution lines because longer distribution lines can lead to greater pressure losses due to friction within the pipes. This can result in uneven water distribution across the landscape, potentially causing some areas to receive insufficient moisture while others may be overwatered. An optimal length of distribution lines is crucial to maintain adequate pressure and ensure that the water reaches all areas effectively.

In contrast, other factors like the time of day when the system operates can influence evaporation rates and how much water is utilized, but they do not directly affect the sprinkler system's operational efficiency in terms of water delivery. The quality of landscaping may affect how well the water is absorbed by soil and plants, yet it does not modify the fundamental workings of the sprinkler system itself. Similarly, the type of fertilizer used is more related to plant health and nutrient uptake rather than directly impacting the mechanics and efficiency of the sprinkler system.