River flow at Point of Rocks is expected to remain close to CO-OP’s daily monitoring threshold, 2000 cfs, for the next several days. The basin received negligible precipitation yesterday. Precipitation totals between 0.0 and 0.1 inches are forecast 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: 0.06 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.26 (inches)
Daily flows:
Little Falls gage flow 2022-11-03: 1254 MGD (1940 cfs)
Little Falls gage flow 2022-11-04: 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 2022-11-03: 1280 MGD (1980 cfs)
Point of Rocks flow 2022-11-04: 1306 MGD (est., based on recently available real-time data) (2020 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-11-03):
Fairfax Water Corbalis withdrawal (Potomac): 72 MGD
WSSC Water Potomac withdrawal: 94 MGD
Washington Aqueduct withdrawal: 132 MGD
Loudoun Water withdrawal: 13 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 312 MGD
Total net Potomac withdrawal: 306 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1980 cfs
QPR, obs: 1980 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.