Tony,
Frankly, not many I remember! Here in TX, water is getting to be both a precious commodity via nature (bad drought last year) and regulation (state "owns" surface water and will take over wells within a few years). Most courses told to cut back watering. None that I know of waters more than what they lose in ET, many water less, and many are beginning to believe the true water need of a course is about half or less of pan evaporation (soil moisture sensors are telling us this)
As to fertilizers, I went to my local supers meeting yesterday for some edumacation on weed control and fate of pesticides, but a small sub discussion broke out. In general, they used to think they needed a pound of N a month, now it seems most use half a pound N, and some even cut that off after July.
For the most part, I think the "overwater to create lush green" is a bit of a myth, at least from my experience, although I do agree than an inexperienced super in a tough year is probably more prone to dial up the water 10% as a cure against what might ail them. Actually, it leads to more problems.
I can recall a few courses a decade ago where the super really didn't know how to run his new computerized irrigation controls, but didn't want to ask anyone for fear of looking dumb. One left his controls in the settings we put in during grow in (about twice the normal amount of water) and that was very noticeable, and golfers complained.
I guess you would have to define overwatering for me. As I said, most US supers are now familiar with what their ET loss is, and water only to that. I actually argue that watering to full ET is overwatering.
In the old days, you watered when the grass got crunchy, meaning about every other day or less watering. Now they feel like you have to keep the tea glass full all the time. But, turf survives on as little as 33% of full moisture capacity, and soil moisture sensors 6" below the surface suggest (as I would expect) that the soil holds much more moisture than air. When ET shows 0.25" loss on a hot night, the soil sensors say soil is depleted maybe a third or less of that. This suggests watering well less than ET will yield just as good a result..
In reality, most courses don't have irrigation systems capabel of full ET replacment, and this happens naturally! In the near future, I expect data from soil moisture sensors to start a move to reduce watering to less than ET.
Dave,
The new USGA turf newsletter talks about how overseeding, even of greens, is going the way of the dodo bird (my words, not theirs!) Overseeding for color sure is a waste of water and often causes transition problems in two peak times for play - spring and fall.