The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.00 to 1.50 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.25 to 1.25 inches of rain over this same area. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will temporarily rise above 2,000 cfs, our trigger for daily drought monitoring, as earlier as sometime today.
Daily Flows:
Little Falls gage flow 2017-10-09: 1053 MGD (1630 cfs)
Little Falls gage flow 2017-10-10: 1112 MGD (est., based on recently available real time data) (1720 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2017-10-09: 1079 MGD (1670 cfs)
Point of Rocks flow 2017-10-10: 1280 MGD (est., based on recently available real time data) (1980 cfs)
Net Potomac withdrawal (2017-10-09):
FW Corbalis withdrawal (Potomac): 106 MGD
WSSC Potomac withdrawal: 147 MGD
Aqueduct withdrawal: 134 MGD
Total Potomac withdrawal: 386 MGD