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 (Friday 10/01/2010)

Submitted by admin1 on Fri, 10/01/2010 - 09:00

Daily monitoring is discontinued because Point of Rocks flow has well exceeded the low flow monitoring threshold. Also, the observed precipitation over the past 48-hours has equaled 1 to 6 inches across most locations in the basin, and the forecast includes additional precipitation in the near future. Thank you all for your contributions to the monitoring effort.

The October Water Supply Outlook, which reports on water conditions in the basin, will be published sometime next week when the available data reflects the recent precipitation in the basin.

Daily Potomac flow and demand update (Thursday 09/30/2010)

Submitted by admin1 on Thu, 09/30/2010 - 09:00

Over the past 24 hours between 0.5 and 4.0 inches of rain has accumulated across the basin, with the heavier rainfall occurring in the downstream area. The 48-hour forecast indicates a chance of another 2.0 to 8.0 inches of rain. Flow at the Point of Rocks gage remains below the 2,000 cfs threshold for now, but we expect it to continue to rise throughout the day. If the anticipated rain arrives in the upstream portions of the basin we expect to discontinue daily monitoring tomorrow.

Daily Potomac flow and demand update (Wednesday 09/29/2010)

Submitted by admin1 on Wed, 09/29/2010 - 09:00

The 24-hour observed precipitation shows that a 1/10 to a 1/4 inch of rain fell on some locations in the basin. The weather forecasts gives a chance of showers for this afternoon and a higher chance of rain for Thursday. The 48-hour and 5-day quantitative precipitation forecasts show 1/2 to 3.8 inches of rain possible across the basin.

Afternoon Potomac flow and demand update (Monday 09/27/2010)

Submitted by admin1 on Mon, 09/27/2010 - 14:00

The weather forecast and operational recommendations remain the same
as this morning.

Daily Flows:
Little Falls gage flow 09/26: 500 MGD (770 cfs)
Little Falls gage flow 09/27: 860 MGD (est., based on most
recently available real time data) (1330 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/26: 710 MGD (1100 cfs)
Point of Rocks flow 09/27: 690 MGD (est., based on recently
available real time data) (1070 cfs)

Afternoon Potomac flow and demand update (Sunday 09/26/2010)

Submitted by admin1 on Sun, 09/26/2010 - 14:00

The weather forecast and operational recommendations are unchanged from this morning.

Daily Flows:
Little Falls gage flow 09/25: 500 MGD (770 cfs)
Little Falls gage flow 09/26: 440 MGD (est., based on most recently available real time data) (686 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/25: 770 MGD (1190 cfs)
Point of Rocks flow 09/26: 720 MGD (est., based on recently available real time data) (1120 cfs)

Afternoon Potomac flow and demand update (Saturday 09/25/2010)

Submitted by admin1 on Sat, 09/25/2010 - 14:00

There have been no changes to the weather forecast and operational recommendations remain the same.

Daily Flows:
Little Falls gage flow 09/24: 600 MGD (930 cfs)
Little Falls gage flow 09/25: 490 MGD (est., based on most recently available real time data) (759 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/24: 790 MGD (1220 cfs)
Point of Rocks flow 09/25: 790 MGD (est., based on recently available real time data) (1220 cfs)

Afternoon Potomac flow and demand update (Friday 09/24/2010)

Submitted by admin1 on Fri, 09/24/2010 - 14:00

There have been no changes to the weather forecast and operational recommendations remain the same.

Daily Flows:
Little Falls gage flow 09/23: 650 MGD (1010 cfs)
Little Falls gage flow 09/24: 580 MGD (est., based on most recently available real time data) (892 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/23: 820 MGD (1270 cfs)
Point of Rocks flow 09/24: 800 MGD (est., based on recently available real time data) (1230 cfs)

Afternoon Potomac flow and demand update (Wednesday 09/22/2010)

Submitted by admin1 on Wed, 09/22/2010 - 14:00

The weather forecast and operational recommendations remain the same.

Daily Flows:
Little Falls gage flow 09/21: 620 MGD (970 cfs)
Little Falls gage flow 09/22: 620 MGD (est., based on most
recently available real time data) (955 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/21: 940 MGD (1450 cfs)
Point of Rocks flow 09/22: 890 MGD (est., based on recently
available real time data) (1380 cfs)

Afternoon Potomac flow and demand update (Tuesday 09/21/2010)

Submitted by admin1 on Tue, 09/21/2010 - 14:00

The weather forecast and operational recommendations remain the same
as this morning.

Daily Flows:
Little Falls gage flow 09/20: 660 MGD (1020 cfs)
Little Falls gage flow 09/21: 600 MGD (est., based on most
recently available real time data) (923 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/20: 930 MGD (1440 cfs)
Point of Rocks flow 09/21: 960 MGD (est., based on recently
available real time data) (1480 cfs)

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