Potomac basin flows continue to slowly decline. The Middle Atlantic River Forecast Center predicts that from 0.10 to 0.75 inches of rain will fall over the basin over the next three days. The Potomac River gage at Little Falls is currently not reporting real-time flows and CO-OP is notifying USGS that this gage is down.
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: 0.11 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.18 (inches)
Daily flows:
Little Falls gage flow 2021-07-27: 1568 MGD, based on partial data (2426 cfs, based on data for only a portion of the day)
Little Falls gage flow 2021-07-28: NOT AVAILABLE
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2021-07-27: 1234 MGD (1910 cfs)
Point of Rocks flow 2021-07-28: 1202 MGD (est., based on recently available real time data) (1860 cfs)
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2021-07-27):
Fairfax Water Corbalis withdrawal (Potomac): 123 MGD
WSSC Water Potomac withdrawal: 138 MGD
Washington Aqueduct withdrawal: 145 MGD
Loudoun Water withdrawal: 12 MGD
Loudoun Water Broad Run discharge: 3 MGD
Total Potomac withdrawal: 418 MGD
Total net Potomac withdrawal: 415 MGD
Loudoun Water drought operations protocol river flow values (2021-07-28):
QPR: 1910 cfs
QPR, obs: 1910 cfs
QPR, WS: 0 cfs