If we were to follow this same graph for a period of years, we would see that the run times increase. This tells us that pumps become less efficient the longer they are in use.
Trending does not tell us about uncontrollable circumstances, but the controllable. This is because trending is not a proactive maintenance solution for root causes. They will not show obstructions to the pumps or discharge lines. Trending can point us to important changes over time and to what rate these changes take place. Indicators such as the RTH, and pump cycles, can help set targets to make interventions. In other words, proper analysis of a trend can provide serious benefits.