Mike ,Isee your point re latin america,hand watering is cheap and good as it brings local employment.We in pac norwest irritate maybe may to oct,yet still need good system.I recall working Broadmoor,Col.,they have 24 inch frost free system,18 inch summer system(big bucks),yet winter dessication from wind and cold could require water in jan.(-10f in morning,70f in afternoon) so maybe no returf or less sod work in spring?.....Other examples u need? Greg