Monitoring Reports

During periods of drought, the Cooperative Water Supply Operations on the Potomac (CO-OP) helps manage the Washington metropolitan area water supply system by coordinating withdrawals from the Potomac River and off-river reservoirs and recommending releases from upstream reservoirs when forecasted flow in the river is not sufficient to meet expected needs. These needs include water demands and an environmental flow-by of 100 million gallons per day (MGD) on the Potomac River at Little Falls dam near Washington, D.C.

Displaying 1 - 7 of 310

Suspending daily monitoring-Daily Potomac flow and demand update (Tuesday 2021-08-17)

Up to 2 inches of rain fell in some areas of the basin in the past 24 hours. 1 to 2.5 inches of rain is expected in the next 72 hours.

CO-OP is suspending daily drought monitoring because flow at the US Geological Survey’s gage at Point of Rocks, Maryland has risen above the 2000 cfs monitoring threshold. Thank you for your daily submission of withdrawal and reservoir storage data. Although active monitoring has been discontinued, it is still helpful if you submit data on a daily basis to help us maintain, update, and verify our forecast tools.

Daily Potomac flow and demand update (Monday 2021-08-16)

Up to half an inch of precipitation fell in some areas of the basin in the past 24 hours. Over the next three days, one to four inches of rain is expected in the basin depending on location.

Daily Potomac flow and demand update (Sunday 2021-08-15)

Over the past 24 hours, the Potomac Basin received 0.1 to 0.5 inches of rain. Depending on location, some isolated areas saw as much as 2 inches. In the next 72 hours, an additional 0.25 to 1.25 inches of rain is possible.

Daily Potomac flow and demand update (Saturday 2021-08-14)

Over the past 24 hours, the Potomac Basin received 0.1 to 2 inches of rain, depending on location. 0.5 to 2 inches of rain are expected in the next 72 hours.

Daily Potomac flow and demand update (Friday 2021-08-13)

Zero precipitation occurred in the basin over the past 24 hours. The Potomac basin has been experiencing a heat advisory that is expected to continue into today.

Daily Potomac flow and demand update (Thursday 2021-08-12)

Scattered precipitation across the basin over the past 24 hours resulted in varied totals, up to 1.75 inches. Up to an inch of rain is expected over the next three days.

Note a correction to the Broad Run discharge for August 10th: the correct value is 6 MGD.

Daily Potomac flow and demand update (Wednesday 2021-08-11)

River flows have responded to yesterday’s storm events. Precipitation in the basin over the past 24 hours was scattered, with trace amounts in most areas but up to an inch and a half in some locations. The National Weather Service forecast calls for accumulations of 0.10 to 0.50 inches in the basin during the next three days.

Pages

Subscribe to Monitoring Reports