Daily Potomac flow and demand update (Tuesday, 2022-10-25)

Submitted by admin1 on Tue, 10/25/2022 - 09:00

According to Middle Atlantic River Forecast Center (MARFC) map products, there was no significant precipitation in the basin over the past 24 hours. The basin has been dry over the past three days, with the exception of the Monocacy sub-basin, which received up to ½ inch of rain. MARFC predicts accumulations of  trace amounts to ¼ inch over the next three days.

Daily flows:
Little Falls gage flow 2022-10-24: 1260 MGD (1950 cfs)
Little Falls gage flow 2022-10-25: 1260 MGD (est., based on recently available real time data) (1950 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2022-10-24: 1299 MGD (2010 cfs)
Point of Rocks flow 2022-10-25: 1370 MGD (est., based on recently available real time data) (2120 cfs)

Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2022-10-24):
Fairfax Water Corbalis withdrawal (Potomac): 75 MGD
WSSC Water Potomac withdrawal: 103 MGD
Washington Aqueduct withdrawal: 132 MGD
Loudoun Water withdrawal: 14 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 323 MGD
Total net Potomac withdrawal: 316 MGD

Loudoun Water drought operations protocol river flow values (based on yesterday's flows):
QPR: 2010 cfs
QPR, obs: 2010 cfs
QPR, WS: 0 cfs

Note to Loudoun Water: See NWS ensemble flow forecasts (HEFS, GEFS, NAEFS) for Point of Rocks flow for the next 7 days – see https://www.weather.gov/erh/mmefs_marfc?id=PORM2&model=NAEFS.

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