Situational Awareness (Sunday, 2023-11-12)
No rain fell in the basin in the past 24 hours and no rain is expected in the next 3 days. Flow fluctuations at the Point of Rocks gage have stabilized in the past couple 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: 0.34 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.34 (inches)
Potomac flow and demand update (Sunday 2023-11-12)
Daily flows:
Little Falls gage flow 2023-11-11: 659 MGD (1020 cfs)
Little Falls gage flow 2023-11-12: 717 MGD (est., based on recently available real-time data) (1110 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2023-11-11: 898 MGD (1390 cfs)
Point of Rocks flow 2023-11-12: 892 MGD (est., based on recently available real-time data) (1380 cfs)
Saturday's estimated daily flows:
Great Falls estimated flow 2023-11-11: 659 MGD (1020 cfs)
Note: Estimated flow below Great Falls intake is flow at Little Falls plus Little Falls water supply withdrawal.
Washington metropolitan area Potomac River withdrawals and discharges (2023-11-11):
Fairfax Water Corbalis withdrawal - Potomac: 67 MGD
WSSC Water Potomac withdrawal: 126 MGD
Washington Aqueduct withdrawal - Great Falls: 119 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 5 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 317 MGD
Total net Potomac withdrawal: 310 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1390 cfs
QPR, obs: 1390 cfs
QPR, WS: 0 cfs