Daily Potomac flow and demand update (Saturday 2021-08-14)

Submitted by admin1 on Sat, 08/14/2021 - 09:00

Over the past 24 hours, the Potomac Basin received 0.1 to 2 inches of rain, depending on location. 0.5 to 2 inches of rain are expected in the next 72 hours.

The National Weather Service’s Hazardous Weather Outlook is still in effect for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and I-95 corridor through central Maryland, northern Virginia, and District of Columbia. Isolated severe storms along with scattered instances of flash flooding are possible on Saturday during the afternoon and evening. Heavy rain and flooding are possible from tropical moisture Monday through Thursday due to the remnants of Tropical Storm Fred. The Weather Prediction Center 5 and 7-day precipitation forecasts suggest we may see 0.75 to 2 inches of rain.

Daily flows:
Little Falls gage flow 2021-08-13: 1270 MGD (1960 cfs)
Little Falls gage flow 2021-08-14: 1650 MGD (est., based on recently available real time data) (2560 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2021-08-13: 1210 MGD (1870 cfs)
Point of Rocks flow 2021-08-14: 1200 MGD (est., based on recently available real time data) (1860 cfs)

Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2021-08-13):
Fairfax Water Corbalis withdrawal (Potomac): 131 MGD
WSSC Water Potomac withdrawal: 109 MGD
Washington Aqueduct withdrawal: NA
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 4 MGD
Total Potomac withdrawal: NA
Total net Potomac withdrawal: NA

Loudoun Water drought operations protocol river flow values (based on yesterday's flows):
QPR: 1870 cfs
QPR, obs: 1870 cfs
QPR, WS: 0 cfs

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