What’s So Glorious About Morning Anyway?

I hate morning glory. My lawn is completely infested with that horrible (and tough as nails) weed. Right now it is the only thing in my backyard that is green. I have been told by our gardener at work that I need to hit it once a week with 24-D for the rest of the summer, and that really does not get rid of it.
I still struggle with how much to water there has to be a perfect amount right? The balances of a green yard (impossible in the weather we are having right now) and a positive checking balance is pretty tough.

MC (from smoke) 97/68