The Maintenance measure contains estimates of savings from improved maintenance practices regarding the repair of pipes and the replacement of sprinkler heads, nozzles, pressure regulators, gaskets, drain valves, and levelers.  The baseline for this measure is the typical leakage rates and uniformity of distribution observed in the population of irrigation systems. It is assumed that typical maintenance practice is to replace hardware components well past the point at which these components start to leak and/or operate outside of their design parameters. The efficient case for these measures is the leakage rates and uniformity of well-maintained systems where components are replaced more frequently than in the baseline.