River flow at Point of Rocks continues to track close to CO-OP’s daily monitoring threshold of 2000 cfs and is expected to for the next couple of days. The basin received no precipitation yesterday. Precipitation forecast totals are between 0.01 and 0.1 inches for the next three days.
Recent basin-wide average precipitation (above Little Falls):
(based on CO-OP's Low Flow Forecast System analysis of Middle Atlantic River Forecast Center (MARFC) gridded multisensor precipitation estimates)
Yesterday's area-weighted average basin precipitation: 0 (inches)
Past 3-day cumulative area-weighted average basin precipitation: 0 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.23 (inches)
Daily flows:
Little Falls gage flow 2022-11-04: 1267 MGD (1960 cfs)
Little Falls gage flow 2022-11-05: 1234 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 2022-11-04: 1267 MGD (1960 cfs)
Point of Rocks flow 2022-11-05: 1247 MGD (est., based on recently available real-time data) (1930 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-11-04):
Fairfax Water Corbalis withdrawal (Potomac): 72 MGD
WSSC Water Potomac withdrawal: 103 MGD
Washington Aqueduct withdrawal: 133 MGD
Loudoun Water withdrawal: 14 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 321 MGD
Total net Potomac withdrawal: 315 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1960 cfs
QPR, obs: 1960 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.