Over the past day, 0 to 0.1 inches of precipitation occurred in the Potomac basin above Little Falls; the majority occurred in the North Branch. According to the MARFC’s 72-hour forecast, total rainfall in the basin will range from 0.01 to 0.5 inches over the next three days, with more rain occurring in the southeastern portions (including the DC area) than in the northwestern parts.
Daily flows:
Little Falls gage flow 2022-10-30: 1202 MGD (1860 cfs)
Little Falls gage flow 2022-10-31: 1176 MGD (est., based on recently available real-time data) (1820 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2022-10-30: 1176 MGD (1820 cfs)
Point of Rocks flow 2022-10-31: 1163 MGD (est., based on recently available real-time data) (1800 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-10-30):
Fairfax Water Corbalis withdrawal (Potomac): 75 MGD
WSSC Water Potomac withdrawal: 92 MGD
Washington Aqueduct withdrawal: 127 MGD
Loudoun Water withdrawal: 10 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 304 MGD
Total net Potomac withdrawal: 298 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1820 cfs
QPR, obs: 1820 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.