Flow at Point of Rocks is currently 1780 cfs, which is below CO-OP's low-flow monitoring threshold of 2,000 cfs. The rating curve at Point of Rocks was changed on Tuesday by the USGS to more accurately reflect channel conditions, and reported flows over the past several weeks were adjusted downward.
Dry conditions are expected to persist at least over the short term. The Middle Atlantic River Forecast Center predicts negligible rainfall in the Potomac basin over the next 72 hours and the National Weather Service forecasts accumulations of only 1/10 inch across most of the basin over the next 7 days.
Thanks to those of you who provided us with recent demand data, and thank you for your ongoing cooperation.
Daily Flows:
Little Falls gage flow 09/17: 1230 MGD (1900 cfs)
Little Falls gage flow 09/18: 1200 MGD (est., based on recently available real time data) (1850 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/17: 1150 MGD (1780 cfs)
Point of Rocks flow 09/18: 1110 MGD (est., based on recently available real time data) (1720 cfs)
Net Potomac Production (09/17/14):
FW Corbalis raw water withdrawal (Potomac): 103 MGD
WSSC Potomac Production: 125 MGD
Aqueduct withdrawal: 135 MGD
Total Potomac demand: 363 MGD