No significant rainfall occurred in the Potomac basin above Little Falls over the past day. According to the MARFC’s 72-hour forecast, total precipitation in the basin will range from 0.01 to 0.25 inches over the next three days, with more rain occurring in the southeastern portions of the basin (including the DC area) than in the northwestern portions.
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: 0.12 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.19 (inches)
Daily flows:
Little Falls gage flow 2022-10-28: 1247 MGD (1930 cfs)
Little Falls gage flow 2022-10-29: 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 2022-10-28: 1176 MGD (1820 cfs)
Point of Rocks flow 2022-10-29: 1222 MGD (est., based on recently available real-time data) (1890 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-10-28):
Fairfax Water Corbalis withdrawal (Potomac): 71 MGD
WSSC Water Potomac withdrawal: 92 MGD
Washington Aqueduct withdrawal: 129 MGD
Loudoun Water withdrawal: 8 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 300 MGD
Total net Potomac withdrawal: 293 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
Interstate Commission on the Potomac River Basin