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 (Wednesday 10/15/2014)

Submitted by admin1 on Wed, 10/15/2014 - 09:00

During the past 24 hours the western half of the basin received 1 to 2 inches of rain. More rain is on the way, with forecasted accumulations of 1 to 2 inches across the basin over the next two days. Given the forecast and recent rainfall, we expect that mean daily flow at Point of Rocks will soon rise above the trigger for daily drought monitoring of 2000 cfs.

Daily Potomac flow and demand update (Sunday 10/12/2014)

Submitted by admin1 on Sun, 10/12/2014 - 09:00

The Potomac basin received 0 to 1/4 of an inch of rain over the past 24 hours. The National Weather Service's 3-day forecast calls for total accumulations of 1/10 to 3/4 inch in the basin, with most areas expecting to receive 1/4 to 1/2 inch of rain..

Flow at Point of Rocks remains below the low-flow threshold of 2,000 cfs. Flow at Point or Rocks continues to rise, but is still below median levels for this time of the year.

Daily Potomac flow and demand update (Saturday 10/11/2014)

Submitted by admin1 on Sat, 10/11/2014 - 09:00

The Potomac basin received 1/4 to 3/4 of an inch of rain over the past 24 hours, and 1/2 to 1 1/2 inches over the past 5 days. Flows throughout the basin continue to rise, but are still below median levels for this time of the year in many areas. The National Weather Service's 3-day forecast calls for total accumulations of 1/4 to 1/2 inch in most parts of the basin.

Daily Potomac flow and demand update (Thursday 10/09/2014)

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

There was no precipitation in the basin over the past 24 hours according to the National Weather Service. Precipitation ranging from one quarter of an inch to one inch is expected across the basin over the next 72 hours according to the Middle Atlantic River Forecast Center. The largest rainfall totals are expected in the central portion of the basin.

Daily Potomac flow and demand update (Wednesday 10/08/2014)

Submitted by admin1 on Wed, 10/08/2014 - 09:00

Flow at Point of Rocks continues to be below the low-flow threshold of 2,000 cfs. Significant precipitation fell over the basin over the past 24 hours, with accumulations of 1/10 to 1/2 inch, and as much as an inch in a few areas. The National Weather Service's 72-hour quantitative precipitation forecast (QPF) calls for 1/4 to 1 inch in the over the next few days.

Daily Potomac flow and demand update (Tuesday 10/07/2014)

Submitted by admin1 on Tue, 10/07/2014 - 09:00

Significant precipitation fell over the northwestern half of the basin over the past 24 hours, with accumulations of 1/10 to 1/2 inch, and over an inch in a few areas. The National Weather Service's 72-hour quantitative precipitation forecast (QPF) calls for 1/4 to 1/2 inch in the northwestern portion of the basin over the next few days.

DROUGHT EXERCISE - Afternoon simulated Potomac flow and demand update (Monday 10/06/2014) - DROUGHT EXERCISE

Submitted by admin1 on Mon, 10/06/2014 - 14:00

This concludes the 2014 drought exercise. Thank you for participating. Special thanks to those who sent in data, provided us information, and took our phone calls. We will document what we learned about potential impacts of power outages on drought operations in the forthcoming 2014 drought exercise report.

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