Monitoring Reports

There has been no change in weather conditions. Operational
recommendations remain the same as in this morning's update.

Daily Flows:
Little Falls gage flow 09/14: 490 MGD (760 cfs)
Little Falls gage flow 09/15: 380 MGD (est., based on most
recently available real time data) (593 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 09/14: 740 MGD (1140 cfs)
Point of Rocks flow 09/15: 720 MGD (est., based on recently
available real time data) (1120 cfs)

No change in the weather forecast. Without additional rain, flows may begin to drop in the near future. The recent drop in Little Falls flows is likely due to the load shift by Washington Aqueduct.

No change in the weather forecast. Flows at Little Falls have improved temporarily. Utilities should operate per operation preference.

Daily Flows:
Little Falls gage flow 09/12: 460 MGD (710 cfs)
Little Falls gage flow 09/13: 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 09/12: 690 MGD (1060 cfs)
Point of Rocks flow 09/13: 720 MGD (est., based on recently available real time data) (1120 cfs)

The rain falling across the basin today is helping to maintain flow
levels and, along with a drop in demands, is keeping utility
operations steady. The releases from the North Branch reservoirs
continue. The leading edge of the release can be seen at the Paw Paw,
WV gage on the mainstem Potomac River.

Washington Aqueduct will go off of the Little Falls pumping station
and back to Great Falls when possible. They were unable to reach the
station earlier in the day due to the triathlon taking place in the
area.

Potomac River flow at the USGS's gage station at Little Falls is now in the vicinity of 300 MGD. There may be some relief from the dry weather this weekend; the National Weather Service predicts accumulations of up to 1/2 inch of rain throughout much of the basin today and tomorrow. The release from the North Branch reservoirs will continue through the weekend.

The Jennings Randolph water supply release, which started at 8:30 AM today (September 10), is currently visible at the USGS stream gage in Luke, MD. The USGS did a rating curve adjustment that resulted in an increase of 71 MGD (110 cfs) at Point of Rocks from this morning's reading. We are watching for the arrival of the Little Seneca release at Little Falls. Past tests have indicated that the time of travel is approximately 29 hours, which would imply the arrival to be at 1:00 PM.

This afternoon we will be requesting concurrence from the general
managers for a release from Jennings Randolph beginning tomorrow
morning. The 50 MGD test release from Little Seneca Reservoir began at
8:00 AM today (September 9) and will continue through 8:00 AM tomorrow
(September 10). The release was observed by Karin Bencala of ICPRB
staff at a location approximately 1 mile downstream of the reservoir.
Flows were observed to be increasing by 9:15 AM. Black Hill Regional
Staff was setting out signs in the park notifying patrons that the

ICPRB COOP has requested concurrence from the utility general managers
to conduct a 50 MGD time of travel test release from approximately
8:00 a.m. on Thursday, September 9 through 8:00 a.m. on Friday,
September 10.

The weather update remains the same as this morning.

The basin did not receive any precipitation in the past 24 hours. Both the 48-hour and the five-day National Weather Service precipitation forecasts indicate no accumulated
rainfall in the basin, except for trace amounts in the North Branch area.

The basin continues to receive no precipitation, except for the small
amount seen yesterday. Both the 48-hour and the five-day National
Weather Service precipitation forecasts indicate no accumulated
rainfall in the basin. Given current conditions, enhanced monitoring
will likely begin tomorrow. Tomorrow we will contact the utilities
directly to confirm procedures.