The National Weather Service (NWS) 24 hour observed precipitation shows that there was between 0.10 and 3.00 inches of precipitation in the Potomac basin above Little Falls. The NWS 3-day and 5-day forecasts both predict 0.00 to 0.25 inches of rain in this same area.
The daily average flow at the US Geological Survey gage at Point of Rocks has been above 2,000 cfs, our trigger for daily monitoring, for the past four days. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks may continue to remain above 2,000 cfs for the week. Therefore, daily monitoring will be discontinued until further notice. Thank you to all for your contribution to the monitoring efforts!
Daily Flows:
Little Falls gage flow 2017-10-29: 1590 MGD (2460 cfs)
Little Falls gage flow 2017-10-30: 2120 MGD (est., based on recently available real time data) (3280 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2017-10-29: 1454 MGD (2250 cfs)
Point of Rocks flow 2017-10-30: 2734 MGD (est., based on recently available real time data) (4230 cfs)
Net Potomac withdrawal (2017-10-29):
FW Corbalis withdrawal (Potomac): 77 MGD
WSSC Potomac withdrawal: 132 MGD
Aqueduct withdrawal: 116 MGD
Total Potomac withdrawal: 325 MGD