Monitoring Reports

DROUGHT EXERCISE - Afternoon simulated Potomac flow and demand update (Friday 09/25/2017) - DROUGHT EXERCISE

Daily Flows (simulated):
Little Falls gage flow 09/24: 130 MGD (210 cfs)
Point of Rocks gage flow 09/24: 550 MGD (850 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Little Falls gage flow 09/25: 120 MGD (186 cfs)
Point of Rocks gage flow 09/25: 440 MGD (681 cfs)

Potomac basin stream flows continue to fall. The 7-day forecast indicates that dry conditions will persist.

Daily Flows:
Little Falls gage flow 2017-09-24: 1138 MGD (1760 cfs)
Little Falls gage flow 2017-09-25: 1034 MGD (est., based on recently available real time data) (1600 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-09-24: 1021 MGD (1580 cfs)
Point of Rocks flow 2017-09-25: 1021 MGD (est., based on recently available real time data) (1580 cfs)

Daily Flows (simulated):
Little Falls gage flow 09/23: 230 MGD (360 cfs)
Point of Rocks gage flow 09/23: 590 MGD (920 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Little Falls gage flow 09/24: 250 MGD (380 cfs)
Point of Rocks gage flow 09/24: 730 MGD (1130 cfs)

Today's estimated demand (09/24/17) P.M.:
WSSC P.M. estimated demand: 190 MGD
FW P.M. estimated demand: 185 MGD
Aqueduct P.M. estimated demand: 150 MGD
Total P.M. estimated demand: 525 MGD

The Middle Atlantic River Forecast Center (MARFC) predicts no rain in the basin over the next 3 days.

Daily Flows:

Little Falls gage flow 2017-09-23: 1222 MGD (1890 cfs)
Little Falls gage flow 2017-09-24: 1144 MGD (est., based on recently available real time data) (1770 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-09-23: 1105 MGD (1710 cfs)
Point of Rocks flow 2017-09-24: 1034 MGD (est., based on recently available real time data) (1600 cfs)

Daily Flows (simulated):
Little Falls gage flow 09/22: 240 MGD (380 cfs)
Little Falls gage flow 09/23: 240 MGD (est., based on most recently available real time data) (370 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/22: 490 MGD (760 cfs)
Point of Rocks gage flow 09/23: 580 MGD (est., based on most recently available real time data) (900 cfs)

Stream flows in the Potomac basin continue to slowly decline. The National Weather Service (NWS) quantitative prediction forecast indicates that less than 1/10 inch of rain will fall in the basin over the next seven day period.

Daily Flows:
Little Falls gage flow 2017-09-22: 1351 MGD (2090 cfs)
Little Falls gage flow 2017-09-23: 1254 MGD (est., based on recently available real time data) (1940 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

The 7-day forecast calls for dry conditions throughout the Potomac basin. Flows in the river are at typical levels for this time of year.

Daily Flows:
Little Falls gage flow 2017-09-21: 1293 MGD (2000 cfs)
Little Falls gage flow 2017-09-22: 1338 MGD (est., based on recently available real time data) (2070 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Point of Rocks flow 2017-09-21: 1377 MGD (2130 cfs)
Point of Rocks flow 2017-09-22: 1280 MGD (est., based on recently available real time data) (1980 cfs)

Flow at Point of Rocks is currently elevated because of two water quality releases made by the Corps last weekend from Jennings Randolph Reservoir. NWS forecasts indicate that dry conditions will persist for the next week.

Daily Flows:
Little Falls gage flow 2017-09-20: 1260 MGD (1950 cfs)
Little Falls gage flow 2017-09-21: 1254 MGD (est., based on recently available real time data) (1940 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Flow at Point of Rocks is currently at about 2000 cfs, CO-OP's trigger for daily drought monitoring. But the likely cause of this rise in flow is the Corps' AVF release on Saturday, Sep 16th. National Weather Service (NWS) forecasts indicate that dry conditions will continue in the basin for the next 7 days.

Daily Flows:
Little Falls gage flow 2017-09-19: 1267 MGD (1960 cfs)
Little Falls gage flow 2017-09-20: 1280 MGD (est., based on recently available real time data) (1980 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.

Potomac River flow at Point of Rocks is hovering around 2000 cfs, the trigger for CO-OP daily drought monitoring. It should be noted that flows in the river are not particularly low for this time of year - 2000 cfs is close to the median flow at Point of Rocks in mid-September. The National Weather Service forecast calls for little rain over the next seven days.