Less than a quarter inch of rain fell in portions of the upper basin over the past 24 hours. Scattered locations with higher precipitation amounts of up to one inch also occurred. Trace amounts, up to 0.1 inches, of rain are expected over the next three days. Flows remain steady above 1,500 cfs.
Daily flows:
Little Falls gage flow 2021-08-05: 1312 MGD (2030 cfs)
Little Falls gage flow 2021-08-06: 1260 MGD (est., based on recently available real time data) (1950 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2021-08-05: 1053 MGD (1630 cfs)
Point of Rocks flow 2021-08-06: 1047 MGD (est., based on recently available real time data) (1620 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2021-08-05):
Fairfax Water Corbalis withdrawal (Potomac): 123 MGD
WSSC Water Potomac withdrawal: 123 MGD
Washington Aqueduct withdrawal: 147 MGD
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 5 MGD
Total Potomac withdrawal: 404 MGD
Total net Potomac withdrawal: 399 MGD
Loudoun Water drought operations protocol river flow values (based on yesterday's flows):
QPR: 1630 cfs
QPR, obs: 1630 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.