Daily Potomac flow and demand update (Saturday 2019-10-19)

According to the Middle Atlantic River Forecast Center, no rain fell in the basin over the past 24 hours. The National Weather Service expects up to an inch of rain in the basin over the next 7 days.

Flows at the USGS gage at Point of Rocks are currently above 2000 cfs, the trigger for daily monitoring. Please note, however, that the USGS has been working on some recent issues with the stage sensor at the Point of Rocks gage. Daily monitoring will be continued at this time to confirm that flows remain above the 2000 cfs threshold for a few days given recent gage corrections.

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 (inches)

Past 3-day cumulative area-weighted average basin precip: 0.65 (inches)

Past 7-day cumulative area-weighted average basin precip: 0.67 (inches)

Daily Flows:

Little Falls gage flow 2019-10-18: 1519 MGD (2350 cfs)

Little Falls gage flow 2019-10-19: 1461 MGD (est., based on recently available real time data) (2260 cfs)

Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2019-10-18: 1293 MGD (2000 cfs)

Point of Rocks flow 2019-10-19: 1474 MGD (est., based on recently available real time data) (2280 cfs)

Yesterday's Net Potomac withdrawal (2019-10-18):

FW Corbalis withdrawal (Potomac): 98 MGD

WSSC Potomac withdrawal: 163 MGD

Aqueduct withdrawal: 144 MGD

Loudoun withdrawal: 11 MGD

Total Potomac withdrawal: 416 MGD