Lake Lavon is the main lake that supplies most of Dallas county with water. Currently, the lake is almost 16 feet below normal (about 15.7 feet). If it continues to get lower and lower, they have threatened to go further with the water restrictions.
Currently, in most areas, you can only water on your trash day between 6pm and 10am. Some areas even restrict watering from 3am-8am. When I say trash day, that's different in difffernt cities. My city has two trash days. We're only one in a handful. Everyone else only has one trash day a week... not much watering going on.
If stage 4 comes into effect, there will be no automatic sprinkler systems allowed, period the end. There will only be hand-watering and soaker hoses allowed. That's because a lot of water is wasted in the streets, sidewalks and driveways with the sprinklers. When hand-watering, the water will all stay on the grass and around the foundation so less water will be used.
I, personally, don't have the patience to hand water, so I guess our grass will dry... but it's almost dormant season anyway.