The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.25 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.40 to 1.75 inches of rain over this same area. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2,000 cfs, our trigger for daily drought monitoring, over the coming week.
Daily Flows:
Little Falls gage flow 2017-10-08: 860 MGD (1330 cfs)
Little Falls gage flow 2017-10-09: 957 MGD (est., based on recently available real time data) (1480 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2017-10-08: 840 MGD (1300 cfs)
Point of Rocks flow 2017-10-09: 957 MGD (est., based on recently available real time data) (1480 cfs)
Net Potomac withdrawal (2017-10-08):
FW Corbalis withdrawal (Potomac): 95 MGD
WSSC Potomac withdrawal: 136 MGD
Aqueduct withdrawal: 133 MGD
Total Potomac withdrawal: 363 MGD