Just for giggles and grins, let's spec out a dream system. Property is a multi-million dollar residence and the sky is the limit for cost. We can start with the following guidelines: 10 hydrozones Valves to be located within each hydrozone Water use efficiency is absolutely required AE must be over 90% for all hydrozones So I will start the list. Item 1: CSI research grade custom weather station with all the bells and whistles appropriate for the site. Item 2: Weighing lysimeter (optionally per hydrozone) Item 3: Soil moisture sensing per micro-climate for each hydrozone. These three items should push the system to about 100K or more without even installing a single valve or laying a foot of pipe, however it will provide extremely accurate ET data for each hydrozone and should be sufficient to meet or exceed item 4 of the guidelines. I made the weighing lysimeters optional for each hydrozone given they are so damned expensive to construct.