No significant amount of rain has fallen in the Potomac basin over the past 3 days. According to Middle Atlantic River Forecast Center estimates, 1/4 to 3/4 inches is expected throughout the basin on Wednesday. Flow in the Potomac River at Point of Rocks is still elevated from last week's rainfall, and is above CO-OP's threshold for drought monitoring. We will reassess the need for daily monitoring after Wednesday's rainfall.
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: 0.00054 (inches)
Past 3-day cumulative area-weighted average basin precip: 0.01639 (inches)
Past 7-day cumulative area-weighted average basin precip: 0.98835 (inches)
Daily Flows:
Little Falls gage flow 2019-10-13: 1286 MGD (1990 cfs)
Little Falls gage flow 2019-10-14: 1222 MGD (est., based on recently available real time data) (1890 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2019-10-13: 1377 MGD (2130 cfs)
Point of Rocks flow 2019-10-14: 1461 MGD (est., based on recently available real time data) (2260 cfs)
Yesterday's Net Potomac withdrawal (2019-10-13):
FW Corbalis withdrawal (Potomac): 101 MGD
WSSC Potomac withdrawal: 171 MGD
Aqueduct withdrawal: 147 MGD (estimated based on ICPRB forecast algorithm; actual value not available at this time)
Loudoun withdrawal: 10 MGD
Total Potomac withdrawal: 430 MGD