According to the Middle Atlantic River Forecasting Center, between 0.25 and 1.5 inches of rain fell in the basin over the past 24 hours. This amounts to a basin-wide average precipitation of about 0.65 inches. Between 0.75 and 1.75 inches of rain is expected over the next 7 days.
Because flows at the USGS gage at Point of Rocks have not significantly risen above 2000 cfs, the trigger for daily monitoring, daily monitoring will be continued at this time. Increases in flows are expected to begin occurring over the next day or two, at which point we will reassess the need for daily monitoring.
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: 0.65141 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.65141 (inches)
Past 7-day cumulative area-weighted average basin precip: 0.6678 (inches)
Daily Flows:
Little Falls gage flow 2019-10-16: 1596 MGD (2470 cfs)
Little Falls gage flow 2019-10-17: 1945 MGD (est., based on recently available real time data) (3010 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2019-10-16: 1267 MGD (1960 cfs)
Point of Rocks flow 2019-10-17: 1293 MGD (est., based on recently available real time data) (2000 cfs)
Yesterday's Net Potomac withdrawal (2019-10-16):
FW Corbalis withdrawal (Potomac): 99 MGD
WSSC Potomac withdrawal: 166 MGD
Aqueduct withdrawal: 150 MGD
Loudoun withdrawal: 11 MGD
Total Potomac withdrawal: 426 MGD