Yesterday's unexpected showers brought some needed relief to the basin, and streamflows are increasing slightly. According to Middle Atlantic River Forecast Center estimates, most of the basin received between 0.25 to 0.75 inches of rain over the past 24 hours. However, no rain is expected over the next 3 days.
The USACE's recreational release last Saturday from Savage Reservoir is now passing by the USGS's stream gage at Hancock, Maryland - see https://waterdata.usgs.gov/md/nwis/uv/?site_no=01613000&PARAmeter_cd=00….
REVISION 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: 0.34878 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.41081 (inches)
Past 7-day cumulative area-weighted average basin precip: 0.44028 (inches)
Daily Flows:
Little Falls gage flow 2019-09-30: 989 MGD (1530 cfs)
Little Falls gage flow 2019-10-01: 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 2019-09-30: 1118 MGD (1730 cfs)
Point of Rocks flow 2019-10-01: 1189 MGD (est., based on recently available real time data) (1840 cfs)
Yesterday's Net Potomac withdrawal (2019-09-30):
FW Corbalis withdrawal (Potomac): 113 MGD
WSSC Potomac withdrawal: 139 MGD
Aqueduct withdrawal: 171 MGD
Loudoun withdrawal: 10 MGD
Total Potomac withdrawal: 432 MGD