Those tightened restrictions are automatically triggered once the level of the reservoir, which serves Athens-Clarke, Oconee, Barrow and Jackson counties, reaches a certain level.
Accordingly, people with odd-number addresses are allowed to water by hand for 25 minutes before 10 a.m. on Sundays, Tuesdays and Thursdays. Even addresses can water on Saturdays, Mondays and Wednesdays with the same time restrictions. No watering is allowed on Fridays.

http://accesswdun.com/article/2008/10/214184