Situational Awareness (Saturday, 2024-07-27)
According to Middle Atlantic River Forecast Center predictions, little rain is expected in the Potomac basin over the next 3 days. The 7-day forecast calls for an average of 0.6 inches in the portion of the watershed above Little Falls.
Special Conditions
None
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: 0.03 (inches)
Past 3-day cumulative area-weighted average basin precipitation: 0.22 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 1.06 (inches)
Daily flows:
Little Falls gage flow 2024-07-26: 1170 MGD (1810 cfs)
Little Falls gage flow 2024-07-27: 1060 MGD (est., based on recently available real-time data) (1640 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2024-07-26: 1215 MGD (1880 cfs)
Point of Rocks flow 2024-07-27: 1163 MGD (est., based on recently available real-time data) (1800 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2024-07-26: 1225 MGD (1895 cfs)
Note: Estimated flow below Great Falls intake is flow at Little Falls plus Little Falls water supply withdrawal.
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2024-07-26):
Fairfax Water Corbalis withdrawal - Potomac: 125 MGD
WSSC Water Potomac withdrawal: 141 MGD
Washington Aqueduct withdrawal - Great Falls: 90 MGD
Washington Aqueduct withdrawal - Little Falls: 55 MGD
Loudoun Water withdrawal: 13 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 424 MGD
Total net Potomac withdrawal: 418 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1880 cfs
QPR, obs: 1880 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin