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 (Sunday 10/05/2014)

Submitted by admin1 on Sun, 10/05/2014 - 09:00

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

Flows are elevated at Little Falls because of the Artificially Varied Flow (AVF) release from Jennings Randolph that occurred on the 27th and 28th of September.

Daily Potomac flow and demand update (Saturday 10/04/2014)

Submitted by admin1 on Sat, 10/04/2014 - 09:00

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

The National Weather Service reports that 0.1 to 1.5 inches of rain fell in the basin in the last 24-hour period. A few small areas of the basin received as much as 1.75 inches of rain in the last 24-hour period. There is 0 to 0.5 inches of rain in the 72-hour forecast. The 7-day forecast indicates accumulations between 0.1 and 1.5 inches of rain possible across the basin.

DROUGHT EXERCISE - Afternoon simulated Potomac flow and demand update (Friday 10/03/2014) - DROUGHT EXERCISE

Submitted by admin1 on Fri, 10/03/2014 - 14:00

SIMULATED SCENARIO: The weather forecast and operational recommendations are unchanged from this morning's email. Potomac River flows are still elevated due to the Derecho event. Suppliers have been requested to take advantage of these flows and to conserve reservoir storage. However, we anticipate that flows will begin to fall to near pre-Derecho levels by Sunday.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

Daily Potomac flow and demand update (Friday 10/03/2014)

Submitted by admin1 on Fri, 10/03/2014 - 09:00

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

The National Weather Service reports that no rain fell in the basin in the last 24-hour period. There is a chance of 1/4 to 1/2 an inch of rain in the 24-hour forecast. The 7-day forecast indicates accumulations between 3/4 and 1 inch of rain is possible across the basin.

DROUGHT EXERCISE - Afternoon simulated Potomac flow and demand update (Thursday 10/02/2014) - DROUGHT EXERCISE

Submitted by admin1 on Thu, 10/02/2014 - 14:00

SIMULATED SCENARIO: Last night's Derecho event continues to impact the area; however, precipitation has ended. Communications are still only available via email. Due to rainfall associated with the event, flows at Little Falls have risen to 570 mgd. WSSC will shut off the release from Little Seneca Reservoir if they can access the dam. Everyone else is proceeding with operational requests to shift back to the Potomac River as much as possible to take advantage of elevated flows.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

Daily Potomac flow and demand update (Thursday 10/02/2014)

Submitted by admin1 on Thu, 10/02/2014 - 09:00

This email reports observed flows and demands as part of ongoing drought operations. A separate email will be provided with today's information for the annual drought exercise.

Only trace amounts of rain fell over the Potomac basin over the past 24 hours. The Middle Atlantic River Forecast Center predicts accumulations of 1/10 to 1/2 inch in the basin over the next 72 hours. Potomac River flow at Point of Rocks is beginning to rise due to the USACE's Sep 27-28 Artificially Varied Flow (AVF) release from the North Branch reservoirs.

DROUGHT EXERCISE - Afternoon simulated Potomac flow and demand update (Wednesday 10/01/2014) - DROUGHT EXERCISE

Submitted by admin1 on Wed, 10/01/2014 - 14:00

SIMULATED: Today's high temperature forecast is 104 degrees F. Scattered thunderstorms are expected this afternoon and evening, and the National Weather Service has issued a severe weather watch for the Baltimore-Washington region. Operational recommendations remain the same as reported in this morning's email.

THE FLOWS, DEMANDS, AND DISCHARGES REPORTED BELOW REFLECT ACTUAL CONDITIONS:

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