Not a plumber however I do know it varies buy region. You need to know the depth of the freeze line in your area. That will determine the depth to install your hydrant.
The brand of yard hydrant that is the best is Woodford's. It is made in the United States. It is a frost free hydrant.
Weep holes are supposed to leak every time you run water through the hydrant. If it leaks constantly, you don't have a problem with a leaky weephole, you have a leaking hydrant. This can be fixed by replacing the rubber stopper at the end of the rod.
Unscrew the rod and change the seal at bottom end .
You may want to install sod in your yard because dense lawns can make your yard really beautiful. They are very easy to install. Also, they are very durable.
No, the plunger blocks the drain hole when the handle is lifted. See this link for more information. http://www.woodfordmfg.com/Woodford/Yard_Hydrant_Pages/how_fpyh_works.htm
Shut off water supply, unscrew the handle and pull up the inner rod. On the lower end is a seal, take the seal to store and get one the same -re-assemble the opposite way.
I do not have an exact answer, but I am assuming they are deep. I live in arid southern California we have a huge yew in our front yard we have been battling for a decade, it does not need water once established
The mattress would have a total area of roughly 1.04 cubic yards. However, a cubic yard is one yard long by one yard wide by one yard deep. The mattress is only 8 inches deep, not enough to equal a yard, so it really does not have any one area that is a cubic yard in size.
You install a goalpost!
$9 per yard
Chances are if you put a Pipe Wrench on the Pipe and turn it, you will damage the fitting that the Pipe screws into below ground. You should dig it up and use two Pipe Wrenches.
A yard of concrete covers about 3 feet. This is because a yard is generally equal to about 3 feet.