UPDATE: (6:15 p.m.) More information just in from D.C. Water — Heymann tells DCist that D.C. Water crews are excavating at this moment to start the repair on the broken valve. The best guess on the water shut-off is approximately 4-6 hours, and that it will mostly affect businesses on the east side of 18th Street NW between Florida Avenue and Columbia Road. DDOT has opened one lane of Florida Avenue to traffic in each direction.

Image courtesy WTTG. An incredibly large water main break is currently shooting water 100 feet into the air in Potomac this evening. (We sure hope that the owner of that house in the bottom right corner there has some good flood insurance.) According to a NBCwashington.com report, a 24-inch water main broke in the 10800 block of Deep Glen Road earlier this afternoon. The Washington Suburban Sanitation Commission, fresh off fixing a cracked 96-inch main,…