In the last 24 hours, trace amounts of precipitation fell in Washington County, Maryland. According to MARFC's precipitation departure calculations, last Wednesday's precipitation improved basin precipitation totals, which are now near normal for the month of October. Precipitation amounts between 0.5 and 0.75 are expected over the next 5 to 7 days.
Flow at the USGS gage at Point of Rocks is currently below 2000 cfs, the trigger for daily monitoring. Daily monitoring will be continued at this time. *
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 precip: 0.00 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.65 (inches)
Past 7-day cumulative area-weighted average basin precip: 0.67 (inches)
Daily Flows:
Little Falls gage flow 2019-10-17: 1829 MGD (2830 cfs)
Little Falls gage flow 2019-10-18: 1519 MGD (est., based on recently available real time data) (2350 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2019-10-17: 1241 MGD (1920 cfs)
Point of Rocks flow 2019-10-18: 1267 MGD (est., based on recently available real time data) (1960 cfs)
Yesterday's Net Potomac withdrawal (2019-10-17):
FW Corbalis withdrawal (Potomac): 87 MGD
WSSC Potomac withdrawal: 163 MGD
Aqueduct withdrawal: 134 MGD
Loudoun withdrawal: 10 MGD
Total Potomac withdrawal: 394 MGD
* Note: The USGS is having some issues with the stage sensor at the site and is checking it out this morning.