Flows at the Little Falls gauge have risen over the past 12 hours, likely in response to the rain that occurred in some parts of the basin yesterday.
Please remember to begin sending a supplemental email each morning by 7:30 am with predicted total and off Potomac withdrawals (in MGD) for today and tomorrow. Thank you for your continued cooperation.
The proactive voluntary load shift from Great Falls to Little Falls by Washington Aqueduct is still ongoing.
Recent basin-wide average precipitation (above Little Falls):
(based on CO-OP's Low Flow Forecast System analysis of Middle Atlantic River Forecast Center (MARFC) gridded multisensor precipitation estimates)
Yesterday's area-weighted average basin precipitation: 0.23 (inches)
Past 3-day cumulative area-weighted average basin precipitation: 0.25 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.25 (inches)
Daily flows:
Little Falls gage flow 2023-09-07: 293 MGD (453 cfs)
Little Falls gage flow 2023-09-08: 535 MGD (est., based on recently available real-time data) (828 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2023-09-07: 821 MGD (1270 cfs)
Point of Rocks flow 2023-09-08: 544 MGD (est., based on recently available real-time data) (842 cfs)
Recommended operations for today (2023-09-08 P.M.):
Fairfax Water:
Keep Potomac withdrawals as steady as possible.
WSSC:
Keep Potomac withdrawals as steady as possible.
Aqueduct:
Keep withdrawals as steady as possible. Gradual changes are preferred to sharp changes.