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.

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Daily Potomac flow and demand update (Friday 2019-10-04)

Adams County, PA, and nearby areas saw some rain yesterday. According to the Middle Atlantic River Forecast Center, accumulations of up to 1/10 inches are expected in the far northern portion of the Potomac basin over the next 3 days, primarily in Pennsylvania. The 7-day forecast is not as promising as it was a few days ago, but accumulations of 1/4 to 3/4 inches are expected throughout most of the basin, mostly occurring Sunday through Tuesday.

Daily Potomac flow and demand update (Thursday 2019-10-03)

Trace amounts of rain fell over some northern areas of the basin over the past 24 hours according to the Middle Atlantic River Forecast Center. Forecasts are calling for 0.5 to 1.5 inches of rainfall across much of the basin over the next 7 days.

REVISION Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of Middle Atlantic River Forecast Center (MARFC) gridded multisensor precipitation estimates)

Yesterday's area-weighted average basin precip: 0.00014 (inches)

Daily Potomac flow and demand update (Wednesday 2019-10-02)

According to Middle Atlantic River Forecast Center estimates, no rain fell in the basin in the past 24 hours. However, streamflows have risen slightly due to Monday's rain, and forecasts call for over an inch and a half of rain throughout most of the basin over the next 7 days.

REVISION Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of Middle Atlantic River Forecast Center (MARFC) gridded multisensor precipitation estimates)

Yesterday's area-weighted average basin precip: 0.00036 (inches)

Daily Potomac flow and demand update (Tuesday 2019-10-01)

Yesterday's unexpected showers brought some needed relief to the basin, and streamflows are increasing slightly. According to Middle Atlantic River Forecast Center estimates, most of the basin received between 0.25 to 0.75 inches of rain over the past 24 hours. However, no rain is expected over the next 3 days.

Daily Potomac flow and demand update (Monday 2019-09-30)

There was no rain in most of the Potomac basin over the past 24 hours, but according to Middle Atlantic River Forecast Center (MARFC) estimates, 0.25 to 0.50 inches of rain fell in a few isolated locations in the western part of the basin yesterday. Forecasts call for the dry conditions to continue, but the MARFC predicts precipitation accumulations of over 0.10 inches in the far western portion of the basin over the next 3 days.

REVISION Recent basin-wide average precipitation (above Little Falls):

Daily Potomac flow and demand update (Sunday 2019-09-29)

According to the Middle Atlantic River Forecast Center, little precipitation fell in the basin over the past 24 hours, and little is expected for the next three days.

Daily Potomac flow and demand update (Saturday 2019-09-28)

According to Middle Atlantic River Forecast Center estimates, little or no rain fell in the Potomac basin over the past 24 hours. According to forecasts, 0.01 to 0.75 inches of rain is expected for the next 7 days (very little of this rain is expected for the next 5 days).

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