River flow continues to slowly decline. There was no appreciable precipitation in the Potomac basin over the past 24 hours. An average basin-wide accumulation of less than 1/10 of an inch is expected over the next three days.
Daily flows:
Little Falls gage flow 2021-08-04: 1403 MGD (2170 cfs)
Little Falls gage flow 2021-08-05: 1403 MGD (est., based on recently available real time data) (2170 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2021-08-04: 1054 MGD (1631 cfs)
Point of Rocks flow 2021-08-05: 1034 MGD (est., based on recently available real time data) (1600 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2021-08-04):
Fairfax Water Corbalis withdrawal (Potomac): 121 MGD
WSSC Water Potomac withdrawal: 120 MGD
Washington Aqueduct withdrawal: 143 MGD
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 395 MGD
Total net Potomac withdrawal: 389 MGD
Loudoun Water drought operations protocol river flow values (based on yesterday's flows):
QPR: 1631 cfs
QPR, obs: 1631 cfs
QPR, WS: 0 cfs
Note to Loudoun Water: See NWS ensemble flow forecasts (HEFS, GEFS, NAEFS) for Point of Rocks flow for the next 7 days – see https://www.weather.gov/erh/mmefs_marfc?id=PORM2&model=NAEFS.