My most useful reads:
Let’s start this one with the BIG NUMBER. To quote the web site of the Alliance for Water Efficiency, “The efficiency of overhead irrigation, such as rotors, and pop-up sprayheads is typically 50 percent and rarely exceeds 70 percent. The efficiency of a well-designed drip irrigation system can reach nearly 100 percent.” This indicates that irrigation efficiency could be as much as DOUBLED by converting to drip. Or, to put it more graphically, the same amount of irrigation would be accomplished using HALF THE WATER! System-wide, that is a BIG number.