Best evidence-based field study of ET controllers
The EVALUATION OF CALIFORNIA WEATHER-BASED "SMART" IRRIGATION CONTROLLER PROGRAMS is the best evidence-based field study of weather based irrigation contollers. It is also the only study that was nearly free-market in its approach to getting data. The MWD and EBMUD should continue to test "Smart" Irrigation controllers so that we KNOW which controllers save the most water from evidence which IA SWAT and EPA WaterSense do NOT provide.

A simplifed chart of table 56 on page 110 of the Evaluation is presented below.