There has been no significant rainfall in the basin over the past 24 hours. The National Weather Service quantitative precipitation
forecasts indicate that there will be accumulations of up to 0.75 inches over much of the basin during the next five days.
A Little Seneca water supply release of 30 MGD (total target of 66 MGD) was requested this morning and will continue until further notice
(SIMULATED). We will watch flows closely to determine the on-going need and magnitude of the release.
(SIMULATED) Daily Flows:
Little Falls gage flow 09/17/15: 210 MGD (330 cfs)
Little Falls gage flow 09/18/15: 160 MGD (est., based on most
recently available real time data) (250 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/17/15: 510 MGD (800 cfs)
Point of Rocks flow 09/18/15: 500 MGD (est., based on recently
available real time data) (780 cfs)
(ACTUAL) Today's estimated demand (09/18/11) P.M.:
WSSC P.M. estimated demand: 170 MGD
FW P.M. estimated demand: 160 MGD
Aqueduct P.M. estimated demand: 138.5 MGD
Total P.M. estimated demand: 468.5 MGD
(ACTUAL) Tomorrow's estimated demand (09/19/11):
WSSC estimated demand: 175 MGD
FW estimated demand: 170 MGD
Aqueduct estimated demand: 152 MGD
Total estimated demand: 497 MGD
SIMULATED operations for today (09/18/15):
Fairfax Water (SIMULATED):
Priority 1: keep Occoquan withdrawals as close to 90 MGD as possible.
Priority 2: maintain Potomac withdrawal as steady as possible.
WSSC (SIMULATED):
Priority 1: keep Patuxent withdrawals as close to 30 MGD as possible.
Priority 2: keep Potomac withdrawals as steady as possible.
Seneca (SIMULATED release date, time, amount in MGD):
Continue the 30 MGD water supply release from Little Seneca as
requested, for a target flow of 66 MGD.
Aqueduct (SIMULATED):
Little Falls: continue use of 50 and 100 MGD pumps (assuming 185 MGD
withdrawal).
Great Falls: per operational preference, but keep gate settings as
steady as possible.
North Branch Reservoirs (SIMULATED):
There are currently no releases from the North Branch reservoirs.