The Potomac basin upstream of Little Falls dam received no significant precipitation over the past 24 hours. The forecast for the next 3 days is 0.01 to 0.10 inches throughout much of the basin, though up to 0.50 inches is expected in the southeastern portion of the basin, including in the Washington, DC, metropolitan area.
Daily flows:
Little Falls gage flow 2021-08-06: 1241 MGD (1920 cfs)
Little Falls gage flow 2021-08-07: 1235 MGD (est., based on recently available real time data) (1910 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2021-08-06: 1041 MGD (1610 cfs)
Point of Rocks flow 2021-08-07: 1047 MGD (est., based on recently available real time data) (1620 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2021-08-06):
Fairfax Water Corbalis withdrawal (Potomac): 135 MGD
WSSC Water Potomac withdrawal: 134 MGD
Washington Aqueduct withdrawal: 144 MGD
Loudoun Water withdrawal: 12 MGD
Loudoun Water Broad Run discharge: 4 MGD
Total Potomac withdrawal: 424 MGD
Total net Potomac withdrawal: 420 MGD
Loudoun Water drought operations protocol river flow values (based on yesterday's flows):
QPR: 1610 cfs
QPR, obs: 1610 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.