Pat, your water management guy may have said "up to 72%" but there's no way you always lose that much irrigation water to evaporation. There are way too many variables such as temperature, humidity, water pressure, wind and the time of day i.e. sun intensity. At 2 in the afternoon on a 103deg. day in Utah with 9% humidity, you might even lose more than 72%. But a cool early morning in Florida, not even close.
I have converted my entire yard to micro-sprinklers. They keep the sprayed water very low and can be adjusted to water exactly where it's needed and not waste any where you don't. You can set them higher for better coverage if needed, but they are very efficient and also pretty inexpensive to set up. Fun too. Like building a Lego sprinkler system.
What I like best is the flexibility of the system, and so far the 3 houses I've put in micro-systems at, plus the local school garden have all lasted well, in fact at my daughter's house in Salt Lake City the system worked great for 5 years before they moved. (we did have to drain and blow out the lines for winter so they didn't freeze, but you need to do that for most irrigation systems where it freezes)
Here's a picture of the school garden system that the teacher and I installed in one Saturday morning. Two little emitters cover a 4 x 8 raised bed perfectly and the water sprays less than a foot up in the air.
