The purpose of this work is a statistical analysis of the net change to water demand among customers who installed evapotranspiration irrigation controllers and customers given irrigation education in the Irvine Ranch Water District, California. This paper documents a statistical analysis of historical water demand to derive estimates of the net water savings from these interventions. This type of empirical investigation is important since California water agencies are considering multimillion dollar investments in this type of demand-side management. Thus, the predictable demand reduction and demand load-shaping are critical to rational economic investment decisions.

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