Monitoring Reports

Over the past 24 hours between 0.5 and 4.0 inches of rain has accumulated across the basin, with the heavier rainfall occurring in the downstream area. The 48-hour forecast indicates a chance of another 2.0 to 8.0 inches of rain. Flow at the Point of Rocks gage remains below the 2,000 cfs threshold for now, but we expect it to continue to rise throughout the day. If the anticipated rain arrives in the upstream portions of the basin we expect to discontinue daily monitoring tomorrow.

The 24-hour observed precipitation shows that a 1/10 to a 1/4 inch of rain fell on some locations in the basin. The weather forecasts gives a chance of showers for this afternoon and a higher chance of rain for Thursday. The 48-hour and 5-day quantitative precipitation forecasts show 1/2 to 3.8 inches of rain possible across the basin.

The weather forecast and operational recommendations remain the same
as this morning.

Daily Flows:
Little Falls gage flow 09/26: 500 MGD (770 cfs)
Little Falls gage flow 09/27: 860 MGD (est., based on most
recently available real time data) (1330 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/26: 710 MGD (1100 cfs)
Point of Rocks flow 09/27: 690 MGD (est., based on recently
available real time data) (1070 cfs)

The weather forecast and operational recommendations are unchanged from this morning.

Daily Flows:
Little Falls gage flow 09/25: 500 MGD (770 cfs)
Little Falls gage flow 09/26: 440 MGD (est., based on most recently available real time data) (686 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/25: 770 MGD (1190 cfs)
Point of Rocks flow 09/26: 720 MGD (est., based on recently available real time data) (1120 cfs)

There have been no changes to the weather forecast and operational recommendations remain the same.

Daily Flows:
Little Falls gage flow 09/24: 600 MGD (930 cfs)
Little Falls gage flow 09/25: 490 MGD (est., based on most recently available real time data) (759 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/24: 790 MGD (1220 cfs)
Point of Rocks flow 09/25: 790 MGD (est., based on recently available real time data) (1220 cfs)

There have been no changes to the weather forecast and operational recommendations remain the same.

Daily Flows:
Little Falls gage flow 09/23: 650 MGD (1010 cfs)
Little Falls gage flow 09/24: 580 MGD (est., based on most recently available real time data) (892 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 09/23: 820 MGD (1270 cfs)
Point of Rocks flow 09/24: 800 MGD (est., based on recently available real time data) (1230 cfs)

As noted in this morning's email, a water supply release from the the
North Branch reservoirs was requested with a Luke target of 312 cfs.
There have been no changes to the weather forecast and operational
recommendations remain the same.

The weather forecast and operational recommendations remain the same.

Daily Flows:
Little Falls gage flow 09/21: 620 MGD (970 cfs)
Little Falls gage flow 09/22: 620 MGD (est., based on most
recently available real time data) (955 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/21: 940 MGD (1450 cfs)
Point of Rocks flow 09/22: 890 MGD (est., based on recently
available real time data) (1380 cfs)

The weather forecast and operational recommendations remain the same
as this morning.

Daily Flows:
Little Falls gage flow 09/20: 660 MGD (1020 cfs)
Little Falls gage flow 09/21: 600 MGD (est., based on most
recently available real time data) (923 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/20: 930 MGD (1440 cfs)
Point of Rocks flow 09/21: 960 MGD (est., based on recently
available real time data) (1480 cfs)

Weather forecasts and operational recommendations are unchanged since this morning. Flow at Little Falls has dropped due to high Potomac River withdrawals this morning, related in part to work that WSSC is doing on their Patuxent plant.