On average, the basin received less than half an inch of rainfall yesterday, with rainfall totals increasing from west to east. Far western areas of the basin received trace amounts of rain while rainfall totals exceeded 1.5 inches in parts of the DC metro area. Between 0.5 and 1.5 inches of additional rainfall is expected over the next 7 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 precip: 0.44 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.44 (inches)
Past 7-day cumulative area-weighted average basin precip: 1.09 (inches)
Daily Flows:
Little Falls gage flow 2019-10-20: 1829 MGD (2830 cfs)
Little Falls gage flow 2019-10-21: 2049 MGD (est., based on recently available real time data) (3170 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2019-10-20: 1267 MGD (1960 cfs)
Point of Rocks flow 2019-10-21: 1415 MGD (est., based on recently available real time data) (2190 cfs)
Yesterday's Net Potomac withdrawal (2019-10-20):
FW Corbalis withdrawal (Potomac): 88 MGD
WSSC Potomac withdrawal: 168 MGD
Aqueduct withdrawal: 135 MGD
Loudoun withdrawal: 10 MGD
Total Potomac withdrawal: 401 MGD