The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.10 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.01 to 0.75 inches of rain over this same area. The US Geological Survey shows that Point of Rocks flow has remained above 2,000 cfs, our trigger for daily monitoring, since yesterday. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will continue to rise above 2,000 cfs for the next couple of days. We will continue daily monitoring efforts until we see that flows have significantly improved for several days.
Daily Flows:
Little Falls gage flow 2017-10-11: 1448 MGD (2240 cfs)
Little Falls gage flow 2017-10-12: 1842 MGD (est., based on recently available real time data) (2850 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2017-10-11: 1351 MGD (2090 cfs)
Point of Rocks flow 2017-10-12: 1609 MGD (est., based on recently available real time data) (2490 cfs)
Net Potomac withdrawal (2017-10-11):
FW Corbalis withdrawal (Potomac): 100 MGD
WSSC Potomac withdrawal: 115 MGD
Aqueduct withdrawal: 144 MGD
Total Potomac withdrawal: 359 MGD