Ken, they use that technique on golf course greens during hot weather, as you may know. Called syringing. Just enough to wet and cool the turf leaf blades without watering the soil too much and causing problems when soil moisture may actually be adequate but cooling transpiration low because of high humidity. I think there's a move now to adding fans in very hot climates (for golf greens that is, haven't heard of anyone using that for daylilies).
