There has been significant rainfall in the DC metropolitan area over the past couple of days, but only approximately 1/4 of an inch in the western portion of the Potomac River basin. The Middle Atlantic River Forecast Center predicts 1/10 to 1/2 of an inch across the southern half of the basin over the next 48 hours, including in the South Branch and Shenandoah areas. The 5-day Quantitative Precipitation Forecast indicates a chance of up to 1 inch of rain across the entire basin.
Daily Flows:
Little Falls gage flow 08/18: 3460 MGD (5360 cfs)
Little Falls gage flow 08/19: 2200 MGD (est., based on recently
available real time data) (3400 cfs)
Note: Gage flow at Little Falls is measured after water
supply withdrawals.
Point of Rocks flow 08/18: 1050 MGD (1630 cfs)
Point of Rocks flow 08/19: 1070 MGD (est., based on recently
available real time data) (1660 cfs)
Net Potomac Production (08/18/10):
FW Corbalis raw water withdrawal (Potomac): 107 MGD
WSSC Potomac Production: 140 MGD
Aqueduct withdrawal: 161 MGD
Total Potomac demand: 408 MGD