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.

Daily Potomac flow and demand update (Tuesday 2017-10-10)

Submitted by admin1 on Tue, 10/10/2017 - 09:00

The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.00 to 1.50 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.25 to 1.25 inches of rain over this same area. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will temporarily rise above 2,000 cfs, our trigger for daily drought monitoring, as earlier as sometime today.

Daily Potomac flow and demand update (Monday 2017-10-09)

Submitted by admin1 on Mon, 10/09/2017 - 09:00

The National Weather Service (NWS) 24 hour observed precipitation shows that there was 0.25 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS 3-day forecast predicts accumulations of 0.40 to 1.75 inches of rain over this same area. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2,000 cfs, our trigger for daily drought monitoring, over the coming week.

Daily Potomac flow and demand update (Sunday 2017-10-08)

Submitted by admin1 on Sun, 10/08/2017 - 09:00

According to the Middle Atlantic River Forecast Center's observed precipitation, there was 0.01 to 0.25 inches of precipitation above the Point of Rocks streamflow gage over the last 24 hours. The National Weather Service (NWS) 3-day forecast predicts accumulations of 0.75 to 1.75 inches of rain in the Potomac basin above Little Falls. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2000 cfs, our trigger for daily drought monitoring, over the coming week.

Daily Potomac flow and demand update (Saturday 2017-10-07)

Submitted by admin1 on Sat, 10/07/2017 - 09:00

The National Weather Service (NWS) 3-day forecast predicts accumulations of 1 1/4 to 2 inches of rain in the Potomac basin above Little Falls. The NWS Global Ensemble Forecast System simulations predict that flow at Point of Rocks will rise above 2000 cfs, our trigger for daily drought monitoring, over the coming week.

Daily Potomac flow and demand update (Friday 2017-10-06)

Submitted by admin1 on Fri, 10/06/2017 - 09:00

The Middle Atlantic Forecast Center forecasts approximately an inch of rain in the basin over the next three days.

Daily Flows:
Little Falls gage flow 2017-10-05: 821 MGD (1270 cfs)
Little Falls gage flow 2017-10-06: 885 MGD (est., based on recently available real time data) (1370 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-05: 976 MGD (1510 cfs)
Point of Rocks flow 2017-10-06: 918 MGD (est., based on recently available real time data) (1420 cfs)

Daily Potomac flow and demand update (Thursday 2017-10-05)

Submitted by admin1 on Thu, 10/05/2017 - 09:00

One to two inches of rain is expected over the next 7 days.

Daily Flows:
Little Falls gage flow 2017-10-04: 840 MGD (1300 cfs)
Little Falls gage flow 2017-10-05: 769 MGD (est., based on recently available real time data) (1190 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-04: 931 MGD (1440 cfs)
Point of Rocks flow 2017-10-05: 1034 MGD (est., based on recently available real time data) (1600 cfs)

Daily Potomac flow and demand update (Wednesday 2017-10-04)

Submitted by admin1 on Wed, 10/04/2017 - 09:00

The National Weather Services 7-day quantitative precipitation forecast continues to look promising.

Daily Flows:
Little Falls gage flow 2017-10-03: 808 MGD (1250 cfs)
Little Falls gage flow 2017-10-04: 814 MGD (est., based on recently available real time data) (1260 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-03: 885 MGD (1370 cfs)
Point of Rocks flow 2017-10-04: 873 MGD (est., based on recently available real time data) (1350 cfs)

Daily Potomac flow and demand update (Tuesday 2017-10-03)

Submitted by admin1 on Tue, 10/03/2017 - 09:00

The National Weather Service's 7-day quantitative precipitation forecast indicates that the basin could receive 1/2 inch to 1 inch of rain at the beginning of next week.

Daily Flows:
Little Falls gage flow 2017-10-02: 827 MGD (1280 cfs)
Little Falls gage flow 2017-10-03: 814 MGD (est., based on recently available real time data) (1260 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Daily Potomac flow and demand update (Monday 2017-10-02)

Submitted by admin1 on Mon, 10/02/2017 - 09:00

River flows continue to fall. It looks like the western portion of the basin could receive some rain toward the end of the next 7-day period.

Daily Flows:
Little Falls gage flow 2017-10-01: 873 MGD (1350 cfs)
Little Falls gage flow 2017-10-02: 840 MGD (est., based on recently available real time data) (1300 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-10-01: 892 MGD (1380 cfs)
Point of Rocks flow 2017-10-02: 834 MGD (est., based on recently available real time data) (1290 cfs)

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