Monitoring Updates

Current drought monitoring status: Daily Monitoring - resumed 10/24/2016

(also conducted 9/1/16 - 9/30/2016)


Daily Potomac flow and demand update (Thursday 12/01/2016)

Between 0.5 and 1.5 inches of rain fell across most of the basin over the past 24 hours. Some areas received up to 2 inches.  Given the recent rains, flow at the Point of Rocks gage has risen to over 2000 cfs, the threshold for daily monitoring.  Flow is expected to continue to rise.  Therefore, daily monitoring will be called off until further notice.  Thank you to all who contributed to the monitoring efforts.  If flows at Point of Rocks drop below 2,000 cfs, daily monitoring will resume.

Daily Flows:

    Little Falls gage flow 11/30: 1260 MGD  (1950 cfs)

    Little Falls gage flow 12/01: 2090 MGD (est., based on recently available real time data)  (3230 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/30: 1170 MGD (1810 cfs)

    Point of Rocks flow 12/01: 1400 MGD (2160 cfs)

Net Potomac Production yesterday (11/30/16):

    FW Corbalis raw water withdrawal (Potomac): 72 MGD

    WSSC Potomac Production: 114 MGD

    Aqueduct withdrawal: 140 MGD

    Total Potomac demand: 326 MGD

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: 0.72 (inches)

   Past 3-day area-weighted average basin precip: 1.20 (inches)

   Past 7-day area-weighted average basin precip: 1.21 (inches)


Daily Potomac flow and demand update (Wednesday 11/30/2016)

The portion of the basin above Little Falls has received 1/10 to 1 inch of rain in the past day, and more is on the way. The MARFC forecast calls for 1 to 1 1/2 inches of accumulation over the next 72 hours.

Daily Flows:

        Little Falls gage flow 11/29: 1070 MGD  (1660 cfs)

        Little Falls gage flow 11/30: 1090 MGD (est., based on recently available real time data)  (1680 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/29: 1100 MGD (1700 cfs)

        Point of Rocks flow 11/30: 1120 MGD (1740 cfs)

Net Potomac Production yesterday (11/29/16):

        FW Corbalis raw water withdrawal (Potomac): 82 MGD

        WSSC Potomac Production: 83 MGD

        Aqueduct withdrawal: 124 MGD

        Total Potomac demand: 289 MGD

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: 0.47 (inches)

   Past 3-day area-weighted average basin precip: 0.48 (inches)

   Past 7-day area-weighted average basin precip: 0.50 (inches)


Daily Potomac flow and demand update (Tuesday 11/29/2016)

Trace amounts of rain fell in most parts of the basin yesterday. Some areas received up to 0.5 inch. 0.75 to 1.5 inch of rain is expected over the next 72 hours, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 11/28: 980 MGD  (1520 cfs)

    Little Falls gage flow 11/29: 980 MGD (est., based on recently available real time data)  (1520 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/28: 1030 MGD (1600 cfs)

    Point of Rocks flow 11/29: 1070 MGD (1660 cfs)

Net Potomac Production yesterday (11/28/16):

    FW Corbalis raw water withdrawal (Potomac): 65 MGD

    WSSC Potomac Production: 138 MGD

    Aqueduct withdrawal: 130 MGD

    Total Potomac demand: 333 MGD

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: 0.01 (inches)

   Past 3-day area-weighted average basin precip: 0.01 (inches)

   Past 7-day area-weighted average basin precip: 0.03 (inches)


Daily Potomac flow and demand update (Monday 11/28/2016)

No rain fell in the basin over the past 24 hours. 3/4 to 1 inch of rain is expected over the next 72 hours, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 11/27: 1000 MGD  (1550 cfs)

    Little Falls gage flow 11/28: 980 MGD (est., based on recently available real time data)  (1520 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/27: 1030 MGD (1590 cfs)

    Point of Rocks flow 11/28: 1030 MGD (1600 cfs)

Net Potomac Production yesterday (11/27/16):

    FW Corbalis raw water withdrawal (Potomac): 103 MGD

    WSSC Potomac Production: 127 MGD

    Aqueduct withdrawal: 120 MGD

    Total Potomac demand: 350 MGD

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 area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.02 (inches)


Daily Potomac flow and demand update (Sunday 11/27/2016)

No  rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 1/4 to 1 inch of rain can be expected over the next 72 hours, with the largest accumulations in the western part of the basin.

Daily Flows:

    Little Falls gage flow 11/26: 1040 MGD  (1610 cfs)

    Little Falls gage flow 11/27: 980 MGD (est., based on recently available real time data)  (1520 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/26: 1030 MGD (1600 cfs)

    Point of Rocks flow 11/27: 1050 MGD (1620 cfs)

Net Potomac Production yesterday (11/26/16):

    FW Corbalis raw water withdrawal (Potomac): 91 MGD

    WSSC Potomac Production: 116 MGD

    Aqueduct withdrawal: 112 MGD

    Total Potomac demand: 319 MGD

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 area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.03 (inches)


Daily Potomac flow and demand update (Friday 11/25/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, up to 1/10 of an inch of rain is expected  in far western portions of the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 11/24: 1020 MGD  (1580 cfs)

    Little Falls gage flow 11/25: 1030 MGD (est., based on recently available real time data)  (1600 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/24: 1030 MGD (1590 cfs)

    Point of Rocks flow 11/25: 1020 MGD (1580 cfs)

Net Potomac Production yesterday (11/24/16):

    FW Corbalis raw water withdrawal (Potomac): 91 MGD

    WSSC Potomac Production: 125 MGD

    Aqueduct withdrawal: 122 MGD

    Total Potomac demand: 338 MGD

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 area-weighted average basin precip: 0.02 (inches)

   Past 7-day area-weighted average basin precip: 0.06 (inches)


Daily Potomac flow and demand update (Thursday 11/24/2016)

Trace amounts of rain fell in the western portion basin over the past 24 hours. Up to 1/10 of an inch of rain is expected in some areas of the basin over the next 72 hours, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 11/23: 1030 MGD  (1600 cfs)

    Little Falls gage flow 11/24: 1010 MGD (est., based on recently available real time data)  (1560 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/23: 1030 MGD (1590 cfs)

    Point of Rocks flow 11/24: 1020 MGD (1580 cfs)

Net Potomac Production yesterday (11/23/16):

    FW Corbalis raw water withdrawal (Potomac): 101 MGD

    WSSC Potomac Production: 128 MGD

    Aqueduct withdrawal: 128 MGD

    Total Potomac demand: 357 MGD

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: 0.02 (inches)

   Past 3-day area-weighted average basin precip: 0.02 (inches)

   Past 7-day area-weighted average basin precip: 0.06 (inches)


Daily Potomac flow and demand update (Wednesday 11/23/2016)

Little rain has fallen in the basin over the past 7 days. Light rain is forecast for the next 72 hours, with accumulations of up to 1/10 inch in most parts of the basin and up to 1/4 inch in the far western areas.

Daily Flows:

        Little Falls gage flow 11/22: 1030 MGD  (1590 cfs)

        Little Falls gage flow 11/23: 1030 MGD (est., based on recently available real time data)  (1600 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/22: 1060 MGD (1640 cfs)

        Point of Rocks flow 11/23: 1030 MGD (1600 cfs)

Net Potomac Production yesterday (11/22/16):

        FW Corbalis raw water withdrawal (Potomac): 96 MGD

        WSSC Potomac Production: 108 MGD

        Aqueduct withdrawal: 129 MGD

        Total Potomac demand: 334 MGD

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 area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.05 (inches)


Daily Potomac flow and demand update (Tuesday 11/22/2016)

No rain fell in the basin over the past 24 hours. Up to 1/4 of an inch is expected over the next 72 hours in the western portion of the basin, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 11/21: 1040 MGD  (1610 cfs)

    Little Falls gage flow 11/22: 1030 MGD (est., based on recently available real time data)  (1600 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/21: 1070 MGD (1660 cfs)

    Point of Rocks flow 11/22: 1060 MGD (1640 cfs)

Net Potomac Production yesterday (11/21/16):

    FW Corbalis raw water withdrawal (Potomac): 84 MGD

    WSSC Potomac Production: 106 MGD

    Aqueduct withdrawal: 118 MGD

    Total Potomac demand: 309 MGD

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 area-weighted average basin precip: 0.04 (inches)

   Past 7-day area-weighted average basin precip: 0.11 (inches)


Daily Potomac flow and demand update (Monday 11/21/2016)

No rain fell in the basin over the past 24 hours. Up to 1/4 of an inch is expected over the next 72 hours in the far western portion of the basin, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 11/20: 1120 MGD  (1730 cfs)

    Little Falls gage flow 11/21: 1030 MGD (est., based on recently available real time data)  (1600 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/20: 1080 MGD (1670 cfs)

    Point of Rocks flow 11/21: 1050 MGD (1620 cfs)

Net Potomac Production yesterday (11/20/16):

    FW Corbalis raw water withdrawal (Potomac): 92 MGD

    WSSC Potomac Production: 114 MGD

    Aqueduct withdrawal: 121 MGD

    Total Potomac demand: 327 MGD

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 area-weighted average basin precip: 0.04 (inches)

   Past 7-day area-weighted average basin precip: 0.22 (inches)


Daily Potomac flow and demand update (Sunday 11/20/2016)

Trace amounts of rain fell in the basin over the past 24 hours. Little to no rain is expected over the next 72 hours, with the exception of the far western portion of the basin, where up to 1/4 inch may fall, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 11/19: 1170 MGD  (1810 cfs)

    Little Falls gage flow 11/20: 1170 MGD (est., based on recently available real time data)  (1810 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/19: 1120 MGD (1740 cfs)

    Point of Rocks flow 11/20: 1070 MGD (1660 cfs)

Net Potomac Production yesterday (11/19/16):

    FW Corbalis raw water withdrawal (Potomac): 82 MGD

    WSSC Potomac Production: 113 MGD

    Aqueduct withdrawal: 129 MGD

    Total Potomac demand: 323 MGD

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: 0.04 (inches)

   Past 3-day area-weighted average basin precip: 0.04 (inches)

   Past 7-day area-weighted average basin precip: 0.22 (inches


Daily Potomac flow and demand update (Saturday 11/19/2016)

No rain fell in the basin over the past 24 hours. Little to no rain is expected over the next 72 hours, with the exception of the far western portion of the basin, where up to 1/2 inch may fall, according to the MARFC.

Daily Flows:

        Little Falls gage flow 11/18: 1170 MGD  (1810 cfs)

        Little Falls gage flow 11/19: 1200 MGD (est., based on recently available real time data)  (1850 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/18: 1160 MGD (1790 cfs)

        Point of Rocks flow 11/19: 1150 MGD (1780 cfs)

Net Potomac Production yesterday (11/18/16):

        FW Corbalis raw water withdrawal (Potomac): 85 MGD

        WSSC Potomac Production: 98 MGD

        Aqueduct withdrawal: 133 MGD

        Total Potomac demand: 316 MGD

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 area-weighted average basin precip: 0.01 (inches)

   Past 7-day area-weighted average basin precip: 0.19 (inches)


Daily Potomac flow and demand update (Friday 11/18/2016)

No rain fell in the basin over the past 24 hours. Up to 1/4 of an inch is expected over the next 72 hours, with the largest amounts possible in the far western portion of the basin, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

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 area-weighted average basin precip: 0.07 (inches)

   Past 7-day area-weighted average basin precip: 0.19 (inches)

Daily Flows:

    Little Falls gage flow 11/17: 1120 MGD  (1730 cfs)

    Little Falls gage flow 11/18: 1140 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 11/17: 1130 MGD (1750 cfs)

    Point of Rocks flow 11/18: 1150 MGD (1780 cfs)

Net Potomac Production yesterday (11/17/16):

    FW Corbalis raw water withdrawal (Potomac): 80 MGD

    WSSC Potomac Production: 113 MGD

    Aqueduct withdrawal: 121 MGD

    Total Potomac demand: 314 MGD


Daily Potomac flow and demand update (Thursday 11/17/2016)

Scattered, trace amounts of rain fell in the basin over the past 24 hours. Up to 1/4 of an inch is expected over the next 72 hours, with the largest amounts possible in the far western portion of the basin, according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

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: 0.01 (inches)

   Past 3-day area-weighted average basin precip: 0.19 (inches)

   Past 7-day area-weighted average basin precip: 0.19 (inches)

Daily Flows:

    Little Falls gage flow 11/16: 1170 MGD  (1810 cfs)

    Little Falls gage flow 11/17: 1200 MGD (est., based on recently available real time data)  (1850 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/16: 1130 MGD (1750 cfs)

    Point of Rocks flow 11/17: 1150 MGD (1780 cfs)

Net Potomac Production yesterday (11/16/16):

    FW Corbalis raw water withdrawal (Potomac): 88 MGD

    WSSC Potomac Production: 119 MGD

    Aqueduct withdrawal: 131 MGD

    Total Potomac demand: 338 MGD


Daily Potomac flow and demand update (Wednesday 11/16/2016)

The basin has received some rain over the past week - an average of 0.38 inches - and Potomac River flows are reasonably steady. The Middle Atlantic River Forecast Center forecasts only trace amounts over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.07 (inches)

   Past 3-day area-weighted average basin precip: 0.18 (inches)

   Past 7-day area-weighted average basin precip: 0.38 (inches)

Daily Flows:

        Little Falls gage flow 11/15: 1160 MGD  (1790 cfs)

        Little Falls gage flow 11/16: 1170 MGD (est., based on recently available real time data)  (1810 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/15: 1140 MGD (1770 cfs)

        Point of Rocks flow 11/16: 1160 MGD (1800 cfs)

Net Potomac Production yesterday (11/15/16):

        FW Corbalis raw water withdrawal (Potomac): 87 MGD

        WSSC Potomac Production: 102 MGD

        Aqueduct withdrawal: 122 MGD

        Total Potomac demand: 311 MGD


Daily Potomac flow and demand update (Tuesday 11/15/2016)

Up to 1 inch of rain fell in scattered portions of the basin over the past 24 hours. Trace amounts of rain are expected in western and central portions of the basin over the next 72 hours according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.12 (inches)

   Past 3-day area-weighted average basin precip: 0.12 (inches)

   Past 7-day area-weighted average basin precip: 0.32 (inches)

Daily Flows:

    Little Falls gage flow 11/14: 1120 MGD  (1730 cfs)

    Little Falls gage flow 11/15: 1140 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 11/14: 1130 MGD (1750 cfs)

    Point of Rocks flow 11/15: 1150 MGD (1780 cfs)

Net Potomac Production yesterday (11/14/16):

    FW Corbalis raw water withdrawal (Potomac): 80 MGD

    WSSC Potomac Production: 104 MGD

    Aqueduct withdrawal: 126 MGD

    Total Potomac demand: 310 MGD


Daily Potomac flow and demand update (Monday 11/14/2016)

No rain fell in the basin over the past 24 hours. Up to 1/4 of an inch is expected over the next 72 hours according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.20 (inches)

Daily Flows:

    Little Falls gage flow 11/13: 1190 MGD  (1840 cfs)

    Little Falls gage flow 11/14: 1110 MGD (est., based on recently available real time data)  (1720 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/13: 1100 MGD (1700 cfs)

    Point of Rocks flow 11/14: 1110 MGD (1720 cfs)

Net Potomac Production yesterday (11/13/16):

    FW Corbalis raw water withdrawal (Potomac): 89 MGD

    WSSC Potomac Production: 121 MGD

    Aqueduct withdrawal: 122 MGD

    Total Potomac demand: 332 MGD


Daily Potomac flow and demand update (Sunday 11/13/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.1 to 0.5 inches can be expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.20 (inches)

Daily Flows:

    Little Falls gage flow 11/12: 1220 MGD  (1890 cfs)

    Little Falls gage flow 11/13: 1200 MGD (est., based on recently available real time data)  (1850 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/12: 1150 MGD (1780 cfs)

    Point of Rocks flow 11/13: 1110 MGD (1720 cfs)

Net Potomac Production yesterday (11/12/16):

    FW Corbalis raw water withdrawal (Potomac): 79 MGD

    WSSC Potomac Production: 100 MGD

    Aqueduct withdrawal: 127 MGD

    Total Potomac demand: 306 MGD


Daily Potomac flow and demand update (Saturday 11/12/2016)

No rain fell in the Potomac basin yesterday. Little or no rain is expected in the central and northwestern portions of the basin over the next seven days, but up to a 1/2 in is expected in the Washington, DC, area.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.20 (inches)

   Past 7-day area-weighted average basin precip: 0.20 (inches)

Daily Flows:

        Little Falls gage flow 11/11: 1210 MGD  (1870 cfs)

        Little Falls gage flow 11/12: 1200 MGD (est., based on recently available real time data)  (1850 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/11: 1200 MGD (1850 cfs)

        Point of Rocks flow 11/12: 1180 MGD (1820 cfs)

Net Potomac Production yesterday (11/11/16):

        FW Corbalis raw water withdrawal (Potomac): 89 MGD

        WSSC Potomac Production: 101 MGD

        Aqueduct withdrawal: 124 MGD

        Total Potomac demand: 314 MGD


Daily Potomac flow and demand update (Friday 11/11/2016)

No rain fell in the basin over the past 24 hours. Trace amounts of rain are expected in the far western portion of the basin over the next 72 hours according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.20 (inches)

   Past 7-day area-weighted average basin precip: 0.27 (inches)

Daily Flows:

    Little Falls gage flow 11/10: 1220 MGD  (1890 cfs)

    Little Falls gage flow 11/11: 1140 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 11/10: 1190 MGD (1840 cfs)

    Point of Rocks flow 11/11: 1220 MGD (1890 cfs)

Net Potomac Production yesterday (11/10/16):

    FW Corbalis raw water withdrawal (Potomac): 80 MGD

    WSSC Potomac Production: 96 MGD

    Aqueduct withdrawal: 127 MGD

    Total Potomac demand: 303 MGD


Daily Potomac flow and demand update (Thursday 11/10/2016)

Up to 0.5 inches of rain fell in some areas of the basin over the past 24 hours. Most areas received less than 0.25 inches. Trace amounts of rain are expected in the far western portion of the basin over the next 72 hours according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.20 (inches)

   Past 3-day area-weighted average basin precip: 0.20 (inches)

   Past 7-day area-weighted average basin precip: 0.33 (inches)

Daily Flows:

    Little Falls gage flow 11/09: 1230 MGD  (1910 cfs)

    Little Falls gage flow 11/10: 1250 MGD (est., based on recently available real time data)  (1940 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/09: 1160 MGD (1790 cfs)

    Point of Rocks flow 11/10: 1190 MGD (1840 cfs)

Net Potomac Production yesterday (11/09/16):

    FW Corbalis raw water withdrawal (Potomac): 87 MGD

    WSSC Potomac Production: 101 MGD

    Aqueduct withdrawal: 122 MGD

    Total Potomac demand: 310 MGD


Daily Potomac flow and demand update (Wednesday 11/09/2016)

Light rain is falling in the basin, with accumulations of 1/10 to 1/4 inch occurring during the late night and early morning hours. More rain is in the forecast for today, with 1/4 inch expected in the eastern portion of the basin. The 7-day forecast indicates that the coming week will be relatively dry.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.13 (inches)

Daily Flows:

        Little Falls gage flow 11/08: 1180 MGD  (1830 cfs)

        Little Falls gage flow 11/09: 1220 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 11/08: 1160 MGD (1790 cfs)

        Point of Rocks flow 11/09: 1180 MGD (1820 cfs)

Net Potomac Production yesterday (11/08/16):

        FW Corbalis raw water withdrawal (Potomac): 85 MGD

        WSSC Potomac Production: 115 MGD

        Aqueduct withdrawal: 128 MGD

        Total Potomac demand: 328 MGD


Daily Potomac flow and demand update (Tuesday 11/08/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.1 to 0.5 inches can be expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.00 (inches)

   Past 7-day area-weighted average basin precip: 0.13 (inches)

Daily Flows:

    Little Falls gage flow 11/07: 1180 MGD  (1820 cfs)

    Little Falls gage flow 11/08: 1170 MGD (est., based on recently available real time data)  (1810 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/07: 1160 MGD (1800 cfs)

    Point of Rocks flow 11/08: 1180 MGD (1820 cfs)

Net Potomac Production yesterday (11/07/16):

    FW Corbalis raw water withdrawal (Potomac): 79 MGD

    WSSC Potomac Production: 110 MGD

    Aqueduct withdrawal: 131 MGD

    Total Potomac demand: 320 MGD


Daily Potomac flow and demand update (Monday 11/07/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.1 to 0.5 inches can be expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.07 (inches)

   Past 7-day area-weighted average basin precip: 0.14 (inches)

Daily Flows:

    Little Falls gage flow 11/06: 1230 MGD  (1900 cfs)

    Little Falls gage flow 11/07: 1170 MGD (est., based on recently available real time data)  (1810 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/06: 1140 MGD (1770 cfs)

    Point of Rocks flow 11/07: 1150 MGD (1780 cfs)

Net Potomac Production yesterday (11/06/16):

    FW Corbalis raw water withdrawal (Potomac): 89 MGD

    WSSC Potomac Production: 112 MGD

    Aqueduct withdrawal: 119 MGD

    Total Potomac demand: 319 MGD


Daily Potomac flow and demand update (Sunday 11/06/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, no rain is  expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.13 (inches)

   Past 7-day area-weighted average basin precip: 0.27 (inches)

Daily Flows:

    Little Falls gage flow 11/05: 1290 MGD  (1990 cfs)

    Little Falls gage flow 11/06: 1200 MGD (est., based on recently available real time data)  (1850 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/05: 1200 MGD (1860 cfs)

    Point of Rocks flow 11/06: 1120 MGD (1740 cfs)

Net Potomac Production yesterday (11/05/16):

    FW Corbalis raw water withdrawal (Potomac): 87 MGD

    WSSC Potomac Production: 116 MGD

    Aqueduct withdrawal: 126 MGD

    Total Potomac demand: 329 MGD


Daily Potomac flow and demand update (Saturday 11/05/2016)

Little rain fell the basin during the past day, and according to National Weather Service forecasts, no significant accumulations of rain are expected over the next 7 days..

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.07 (inches)

   Past 3-day area-weighted average basin precip: 0.13 (inches)

   Past 7-day area-weighted average basin precip: 0.27 (inches)

Daily Flows:

        Little Falls gage flow 11/04: 1310 MGD  (2030 cfs)

        Little Falls gage flow 11/05: 1310 MGD (est., based on recently available real time data)  (2030 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/04: 1230 MGD (1900 cfs)

        Point of Rocks flow 11/05: 1230 MGD (1910 cfs)

Net Potomac Production yesterday (11/04/16):

        FW Corbalis raw water withdrawal (Potomac): 86 MGD

        WSSC Potomac Production: 103 MGD

        Aqueduct withdrawal: 136 MGD

        Total Potomac demand: 325 MGD


Daily Potomac flow and demand update (Friday 11/04/2016)

Scattered trace amounts of rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, no rain is expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.06 (inches)

   Past 3-day area-weighted average basin precip: 0.06 (inches)

   Past 7-day area-weighted average basin precip: 0.2 (inches)

Daily Flows:

    Little Falls gage flow 11/03: 1380 MGD  (2130 cfs)

    Little Falls gage flow 11/04: 1430 MGD (est., based on recently available real time data)  (2210 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/03: 1280 MGD (1980 cfs)

    Point of Rocks flow 11/04: 1280 MGD (1980 cfs)

Net Potomac Production yesterday (11/03/16):

    FW Corbalis raw water withdrawal (Potomac): 88 MGD

    WSSC Potomac Production: 108 MGD

    Aqueduct withdrawal: 133 MGD

    Total Potomac demand: 330 MGD


Daily Potomac flow and demand update (Thursday 11/03/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, light rain, ranging from trace amounts to 0.25 inches, is expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.02 (inches)

   Past 7-day area-weighted average basin precip: 0.23 (inches)

Daily Flows:

        Little Falls gage flow 11/02: 1420 MGD  (2200 cfs)

        Little Falls gage flow 11/03: 1370 MGD (est., based on recently available real time data)  (2120 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 11/02: 1250 MGD (1930 cfs)

        Point of Rocks flow 11/03: 1330 MGD (2050 cfs)

Net Potomac Production yesterday (11/02/16):

        FW Corbalis raw water withdrawal (Potomac): 81 MGD

        WSSC Potomac Production: 114 MGD

        Aqueduct withdrawal: 131 MGD

        Total Potomac demand: 325 MGD


Daily Potomac flow and demand update (Wednesday 11/02/2016)

Scattered trace amounts of rain fell in the southwestern portion of the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.1 to 0.5 inches are expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.14 (inches)

   Past 7-day area-weighted average basin precip: 0.23 (inches)

Daily Flows:

    Little Falls gage flow 11/01: 1360 MGD  (2100 cfs)

    Little Falls gage flow 11/02: 1460 MGD (est., based on recently available real time data)  (2260 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 11/01: 1270 MGD (1960 cfs)

    Point of Rocks flow 11/02: 1230 MGD (1910 cfs)

Net Potomac Production yesterday (11/01/16):

    FW Corbalis raw water withdrawal (Potomac): 83 MGD

    WSSC Potomac Production: 105 MGD

    Aqueduct withdrawal: 123 MGD

    Total Potomac demand: 311 MGD


Daily Potomac flow and demand update (Monday 10/31/2016)

Light rain fell in the Potomac basin yesterday, with most areas above Little Falls receiving trace amounts to 1/4 inch, and some isolated areas receiving more than 1/2 inch. No rain is in the forecast over the next three days.

Daily Flows:

        Little Falls gage flow 10/30: 1340 MGD  (2070 cfs)

        Little Falls gage flow 10/31: 1280 MGD (est., based on recently available real time data)  (1980 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 10/30: 1240 MGD (1920 cfs)

        Point of Rocks flow 10/31: 1290 MGD (2000 cfs)

Net Potomac Production yesterday (10/30/16):

        FW Corbalis raw water withdrawal (Potomac): 88 MGD

        WSSC Potomac Production: 122 MGD

        Aqueduct withdrawal: 116 MGD

        Total Potomac demand: 325 MGD

Saturday's Net Potomac Production in yesterday's report was incomplete. The complete figures appear below:

Net Potomac Production on 10/29/16:

    FW Corbalis raw water withdrawal (Potomac): 87 MGD

    WSSC Potomac Production: 107 MGD

    Aqueduct withdrawal: 130 MGD

    Total Potomac demand: 324 MGD


Daily Potomac flow and demand update (Sunday 10/30/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, up to 0.25 inches of rain is expected over the next 72 hours with the largest amounts expected in the northern portions of the basin.

Daily Flows:

    Little Falls gage flow 10/29: 1330 MGD  (2060 cfs)

    Little Falls gage flow 10/30: 1340 MGD (est., based on recently available real time data)  (2070 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 10/29: 1230 MGD (1910 cfs)

    Point of Rocks flow 10/30: 1230 MGD (1910 cfs)

Net Potomac Production yesterday (10/29/16):

    FW Corbalis raw water withdrawal (Potomac): not reported

    WSSC Potomac Production: 107 MGD

    Aqueduct withdrawal: 130 MGD

    Total Potomac demand (not including FW Corbalis): 237 MGD

FW Corbalis raw water withdrawal for 10/29/16 will be included in Monday's update.


Daily Potomac flow and demand update (Saturday 10/29/2016)

No rain fell in  the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, up to 0.25 inches can be expected in the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 10/28: 1360 MGD  (2100 cfs)

    Little Falls gage flow 10/29: 1250 MGD (est., based on recently available real time data)  (1940 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 10/28: 1260 MGD (1950 cfs)

    Point of Rocks flow 10/29: 1280 MGD (1980 cfs)

Net Potomac Production yesterday (10/28/16):

    FW Corbalis raw water withdrawal (Potomac): 94 MGD

    WSSC Potomac Production: 126 MGD

    Aqueduct withdrawal: 139 MGD

    Total Potomac demand: 359 MGD


Daily Potomac flow and demand update (Friday 10/28/2016)

Up to half an inch of rain fell in scattered portions of the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, trace amounts of rainfall are expected across the northern portion of the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 10/27: 1380 MGD  (2130 cfs)

    Little Falls gage flow 10/28: 1370 MGD (est., based on recently available real time data)  (2120 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 10/27: 1260 MGD (1950 cfs)

    Point of Rocks flow 10/28: 1290 MGD (2000 cfs)

Net Potomac Production yesterday (10/27/16):

    FW Corbalis raw water withdrawal (Potomac): 85 MGD

    WSSC Potomac Production: 108 MGD

    Aqueduct withdrawal: 135 MGD

    Total Potomac demand: 328 MGD


Daily Potomac flow and demand update (Thursday 10/27/2016)

Little rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.01 to 0.5 inches can be expected across the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 10/26: 1440 MGD  (2220 cfs)

    Little Falls gage flow 10/27: 1430 MGD (est., based on recently available real time data)  (2210 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 10/26: 1270 MGD (1970 cfs)

    Point of Rocks flow 10/27: 1330 MGD (2050 cfs)

Net Potomac Production yesterday (10/26/16):

    FW Corbalis raw water withdrawal (Potomac): 94 MGD

    WSSC Potomac Production: 113 MGD

    Aqueduct withdrawal: 125 MGD

    Total Potomac demand: 331 MGD


Daily Potomac flow and demand update (Wednesday 10/26/2016)

Little rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.1 to 0.5 inches can be expected across the basin over the next 72 hours. Flow at Point of Rocks continues to hover around 2,000 cfs (current flow is 2,050 cfs), the threshold for daily monitoring activities.  We will continue to evaluate the need for monitoring.

Daily Flows:

    Little Falls gage flow 10/25: 1380 MGD  (2140 cfs)

    Little Falls gage flow 10/26: 1430 MGD (est., based on recently available real time data)  (2210 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 10/25: 1330 MGD (2060 cfs)

    Point of Rocks flow 10/26: 1330 MGD (2050 cfs)

Net Potomac Production yesterday (10/25/16):

    FW Corbalis raw water withdrawal (Potomac): 90 MGD

    WSSC Potomac Production: 113 MGD

    Aqueduct withdrawal: 115 MGD

    Total Potomac demand: 318 MGD


Daily Potomac flow and demand update (Tuesday 10/25/2016)

The US Geological Survey has revised the stage-discharge relationship for the Point of Rocks gage based on measurements taken yesterday. Sunday's flow was revised upward to 2030 cfs (an increase of 290 cfs). Based on this new data and current hydrological conditions, the need for daily monitoring will be reviewed.

According to MARFC estimates, no rain fell in the Potomac basin yesterday, and accumulations of 1/10 to 1/2 inch are expected over the next 72 hours.

Recent basin-wide average precipitation (above Little Falls):

(based on CO-OP's Low Flow Forecast System analysis of MARFC gridded multisensor precipitation estimates)

   Yesterday's area-weighted average basin precip: 0.00 (inches)

   Past 3-day area-weighted average basin precip: 0.01 (inches)

Daily Flows:

        Little Falls gage flow 10/24: 1420 MGD  (2200 cfs)

        Little Falls gage flow 10/25: 1370 MGD (est., based on recently available real time data)  (2120 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 10/24: 1330 MGD (2060 cfs)

        Point of Rocks flow 10/25: 1350 MGD (2090 cfs)

Net Potomac Production yesterday (10/24/16):

        FW Corbalis raw water withdrawal (Potomac): 99 MGD

        WSSC Potomac Production: 113 MGD

        Aqueduct withdrawal: 128 MGD

        Total Potomac demand: 340 MGD


Daily Potomac flow and demand update (Monday 10/24/2016)

Potomac River flow at Point of Rocks has dropped below CO-OP's low flow monitoring threshold of 2,000 cfs (daily average). Therefore, we are resuming daily monitoring and reporting of flows and withdrawals. If you are responsible for reporting daily numbers, please report yesterday's withdrawals by 8:00 AM every day, including weekends. Reporting can be by email to coop@icprb.org, or by telephone by leaving a message with the CO-OP operations number at 301 984 1908 x138. (Online reporting should resume soon after a website security update.) Thank you in advance for your contribution to the monitoring efforts.

According to the Middle Atlantic River Forecast Center (MARFC) multi-sensor precipitation estimates, no rain fell yesterday in the portion of the Potomac basin above Little Falls. MARFC forecasts indicate that the basin will receive up to 0.25 inches over the next 72 hours, with the highest accumulations expected in the far northwestern areas of the basin.

Daily Flows:

        Little Falls gage flow 10/23: 1540 MGD  (2380 cfs)

        Little Falls gage flow 10/24: 1460 MGD (est., based on recently available real time data)  (2260 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 10/23: 1120 MGD (1740 cfs)

        Point of Rocks flow 10/24: 1140 MGD (1760 cfs)

Net Potomac Production yesterday (10/23/16):

        FW Corbalis raw water withdrawal (Potomac): 94 MGD

        WSSC Potomac Production: 107 MGD

        Aqueduct withdrawal: 128 MGD

        Total Potomac demand: 329 MGD


Daily Potomac flow and demand update (Friday 09/30/2016)

Flow at the Point of Rocks gage has risen to over 2000 cfs, the threshold for daily monitoring, and additional rainfall is expected.  Therefore, daily monitoring will be called off until further notice.  Thank you to all who contributed to the monitoring efforts.  If flows at Point of Rocks drop below 2,000 cfs, daily monitoring will be resumed.

Daily Flows:

    Little Falls gage flow 09/29: 2180 MGD  (3380 cfs)

    Little Falls gage flow 09/30: 2270 MGD (est., based on recently available real time data)  (3510 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/29: 2350 MGD (3630 cfs)

    Point of Rocks flow 09/30: 2640 MGD (est., based on recently available real time data) (4080 cfs)

Net Potomac Production yesterday (09/29/16):

    FW Corbalis raw water withdrawal (Potomac): 72 MGD

    WSSC Potomac Production: 96 MGD

    Aqueduct withdrawal: 135 MGD

    Total Potomac demand: 303 MGD


Daily Potomac flow and demand update (Thursday 09/29/2016)

Significant amounts of rain ranging from 0.5 to 4 inches fell in the basin over the past 24 hours. More rain is expected to come. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 2 to 5 inches can be expected across the basin over the next 72 hours. Potomac flow at Point of Rocks reached 3110 cfs this morning and and is rising.

Daily Flows:

    Little Falls gage flow 09/28: 850 MGD  (1310 cfs)

    Little Falls gage flow 09/29: 2420 MGD (est., based on recently available real time data)  (3740 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/28: 830 MGD (1290 cfs)

    Point of Rocks flow 09/29: 2010 MGD (3110 cfs)

Net Potomac Production yesterday (09/28/16):

    FW Corbalis raw water withdrawal (Potomac): 104 MGD

    WSSC Potomac Production: 118 MGD

    Aqueduct withdrawal: 133 MGD

    Total Potomac demand: 354 MGD


Daily Potomac flow and demand update (Wednesday 09/28/2016)

Over the past 24 hours, trace amounts to 0.5 inches of rain fell on the basin. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, widespread rainfall amounts of 2 to 6 inches are expected across the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 09/27: 800 MGD  (1240 cfs)

    Little Falls gage flow 09/28: 810 MGD (est., based on recently available real time data)  (1260 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/27: 820 MGD (1270 cfs)

    Point of Rocks flow 09/28: 850 MGD (1310 cfs)

Net Potomac Production yesterday (09/27/16):

    FW Corbalis raw water withdrawal (Potomac): 85 MGD

    WSSC Potomac Production: 117 MGD

    Aqueduct withdrawal: 156 MGD

    Total Potomac demand: 358 MGD


Daily Potomac flow and demand update (Monday 09/26/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 1/10  to 3/4 of an inch of rain can be expected across the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 09/25: 930 MGD  (1440 cfs)

    Little Falls gage flow 09/26: 810 MGD (est., based on recently available real time data)  (1260 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/25: 890 MGD (1380 cfs)

    Point of Rocks flow 09/26: 860 MGD (1330 cfs)

Net Potomac Production yesterday (09/25/16):

    FW Corbalis raw water withdrawal (Potomac): 119 MGD

    WSSC Potomac Production: 118 MGD

    Aqueduct withdrawal: 142 MGD

    Total Potomac demand: 380 MGD


Daily Potomac flow and demand update (Sunday 09/25/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, 0.25 to 1 inch of rain can be expected across the basin over the next 72 hours.  Higher precipitation amounts are expected in the eastern portion of the basin.

Daily Flows:

    Little Falls gage flow 09/24: 1070 MGD  (1660 cfs)

    Little Falls gage flow 09/25: 960 MGD (est., based on recently available real time data)  (1480 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/24: 1010 MGD (1570 cfs)

    Point of Rocks flow 09/25: 960 MGD (1480 cfs)

Net Potomac Production yesterday (09/24/16):

    FW Corbalis raw water withdrawal (Potomac): 105 MGD

    WSSC Potomac Production: 118 MGD

    Aqueduct withdrawal: 147 MGD

    Total Potomac demand: 370 MGD


Daily Potomac flow and demand update (Saturday 09/24/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, up to 0.1 inch of rain can be expected over the next 72 hours.  

Daily Flows:

    Little Falls gage flow 09/23: 1080 MGD  (1670 cfs)

    Little Falls gage flow 09/24: 1110 MGD (est., based on recently available real time data)  (1720 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/23: 1140 MGD (1770 cfs)

    Point of Rocks flow 09/24: 1110 MGD (1720 cfs)

Net Potomac Production yesterday (09/23/16):

    FW Corbalis raw water withdrawal (Potomac): 121 MGD

    WSSC Potomac Production: 117 MGD

    Aqueduct withdrawal: 152 MGD

    Total Potomac demand: 389 MGD


Daily Potomac flow and demand update (Friday 09/23/2016)

No rain fell in the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, up to 0.1 inch of rain can be expected across the southern portion of the basin over the next 72 hours.  

Daily Flows:

    Little Falls gage flow 09/22: 850 MGD  (1310 cfs)

    Little Falls gage flow 09/23: 960 MGD (est., based on recently available real time data)  (1480 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/22: 1490 MGD (2310 cfs)

    Point of Rocks flow 09/23: 1270 MGD (est., based on recently available real time data) (1960 cfs)

Net Potomac Production yesterday (09/22/16):

    FW Corbalis raw water withdrawal (Potomac): 109 MGD

    WSSC Potomac Production: 111 MGD

    Aqueduct withdrawal: 155 MGD

    Total Potomac demand: 375 MGD


Daily Potomac flow and demand update (Thursday 09/22/2016)

No rain fell in the basin in the past 24 hours.  According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, no rain is expected over the next 72 hours.

Daily Flows:

    Little Falls gage flow 09/21: 780 MGD  (1210 cfs)

    Little Falls gage flow 09/22: 840 MGD (est., based on recently available real time data)  (1300 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/21: 1090 MGD (1690 cfs)

    Point of Rocks flow 09/22: 1640 MGD (2540 cfs)

Net Potomac Production yesterday (09/21/16):

    FW Corbalis raw water withdrawal (Potomac): 101 MGD

    WSSC Potomac Production: 110 MGD

    Aqueduct withdrawal: 134 MGD

    Total Potomac demand: 345 MGD


Daily Potomac flow and demand update (Wednesday 09/21/2016)

No rain fell in the basin over the past 24 hours.  According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, no rain is expected over the next 72 hours.

Daily Flows:

    Little Falls gage flow 09/20: 730 MGD  (1130 cfs)

    Little Falls gage flow 09/21: 770 MGD (est., based on recently available real time data)  (1190 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/20: 960 MGD (1480 cfs)

    Point of Rocks flow 09/21: 1070 MGD (1660 cfs)

Net Potomac Production yesterday (09/20/16):

    FW Corbalis raw water withdrawal (Potomac): 87 MGD

    WSSC Potomac Production: 109 MGD

    Aqueduct withdrawal: 150 MGD

    Total Potomac demand: 346 MGD


Daily Potomac flow and demand update (Monday 09/19/2016)

Between 0 and 0.5 inch of rain fell on the basin over the past 24 hours. A few small areas received as much as 1 inch of rain. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between 1/4 and 1 3/4 inches of rain is expected over the next 72 hours.

Daily Flows:
   Little Falls gage flow 09/18: 710 MGD  (1100 cfs)
   Little Falls gage flow 09/19: 660 MGD (est., based on recently available real time data)  (1020 cfs)
         Note: Gage flow at Little Falls is measured after water supply withdrawals.
   Point of Rocks flow 09/18: 810 MGD (1260 cfs)
   Point of Rocks flow 09/19: 830 MGD (1290 cfs)

Net Potomac Production yesterday (09/18/16):

   FW Corbalis raw water withdrawal (Potomac): 120 MGD
   WSSC Potomac Production: 121 MGD
   Aqueduct withdrawal: 148 MGD
   Total Potomac demand: 389 MGD


Daily Potomac flow and demand update (Sunday 09/18/2016)

Trace amounts of rain fell in the North Branch of the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between 0.25 and 1.25 of an inch is expected over the next 72 hours. The National Weather Service's 5-day forecast shows up to 1.7 inches of rain.

The artificially varied flow (AVF) release from Jennings Randolph Lake that began yesterday (Saturday 09/17/2016) will be ending today (Sunday 09/18/2016) around 4:00 pm. The target flow rate is 850 cfs.  

Daily Flows:

    Little Falls gage flow 09/17: 740 MGD  (1140 cfs)

    Little Falls gage flow 09/18: 720 MGD (est., based on recently available real time data)  (1120 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/17: 830 MGD (1290 cfs)

    Point of Rocks flow 09/18: 810 MGD (1250 cfs)

Net Potomac Production yesterday (09/17/16):

    FW Corbalis raw water withdrawal (Potomac): 120 MGD

    WSSC Potomac Production: 113 MGD

    Aqueduct withdrawal: 140 MGD

    Total Potomac demand: 373 MGD


Daily Potomac flow and demand update (Saturday 09/17/2016)

No rain fell on the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between 1/4 and 3/4 of an inch is expected over the next 72 hours.

Daily Flows:
   Little Falls gage flow 09/16: 750 MGD  (1160 cfs)
   Little Falls gage flow 09/17: 740 MGD (est., based on recently available real time data)  (1150 cfs)
         Note: Gage flow at Little Falls is measured after water supply withdrawals.
   Point of Rocks flow 09/16: 890 MGD (1370 cfs)
   Point of Rocks flow 09/17: 860 MGD (1330 cfs)


Net Potomac Production yesterday (09/16/16):

   FW Corbalis raw water withdrawal (Potomac): 129 MGD
   WSSC Potomac Production: 127 MGD
   Aqueduct withdrawal: 155 MGD
   Total Potomac demand: 412 MGD


Daily Potomac flow and demand update (Friday 09/16/2016)

Little rain fell on the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between zero and 1/2 of an inch is expected over the next 72 hours. An artificially varied flow (AVF) release from Jennings Randolph Lake is scheduled for Saturday and Sunday, September 17 and 18, 2016.  The target flow rate is 850 cfs. More information on the release can be found on this webpage of the of US Army Corps of Engineers: http://www.nab-wc.usace.army.mil/northBranch.html

Daily Flows:
   Little Falls gage flow 09/15: 840 MGD  (1300 cfs)
   Little Falls gage flow 09/16: 770 MGD (est., based on recently available real time data)  (1190 cfs)
         Note: Gage flow at Little Falls is measured after water supply withdrawals.
   Point of Rocks flow 09/15: 950 MGD (1470 cfs)
   Point of Rocks flow 09/16: 920 MGD (1420 cfs)


Net Potomac Production yesterday (09/15/16):

   FW Corbalis raw water withdrawal (Potomac): 131 MGD
   WSSC Potomac Production: 126 MGD
   Aqueduct withdrawal: 159 MGD
   Total Potomac demand: 416 MGD


Daily Potomac flow and demand update (Thursday 09/15/2016)

No significant rain fell in the basin yesterday. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between 1/10 and 1/2 of an inch is expected in the far western portion of the basin over the next 72 hours, but little rain else where.

Daily Flows:

        Little Falls gage flow 09/14: 950 MGD  (1470 cfs)

        Little Falls gage flow 09/15: 860 MGD (est., based on recently available real time data)  (1330 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 09/14: 1000 MGD (1550 cfs)

        Point of Rocks flow 09/15: 980 MGD (1520 cfs)

Net Potomac Production yesterday (09/14/16):

        FW Corbalis raw water withdrawal (Potomac): 138 MGD

        WSSC Potomac Production: 126 MGD

        Aqueduct withdrawal: 156 MGD

        Total Potomac demand: 420 MGD


Daily Potomac flow and demand update (Wednesday 09/14/2016)

Little to no rain fell in the basin yesterday. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between zero and 1/10 of an inch is expected over the next 72 hours, mainly in the northern portion of the basin.

Daily Flows:

    Little Falls gage flow 09/13: 905 MGD  (1400 cfs)

    Little Falls gage flow 09/14: 982 MGD  (est., based on recently available real time data)  (1520 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/13: 1183 MGD  (1830 cfs)

    Point of Rocks flow 09/14: 1047 MGD  (est., based on recently available real time data)  (1620 cfs)

Net Potomac Production yesterday (09/13/2016):

    FW Corbalis raw water withdrawal (Potomac): 126 MGD

    WSSC Potomac Production: 127 MGD

    Aqueduct withdrawal: 163 MGD

    Total Potomac demand: 416 MGD


Daily Potomac flow and demand update (Tuesday 09/13/2016)

No rain fell in the basin yesterday. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, no rain is expected over the next 72 hours.  

Daily Flows:

    Little Falls gage flow 09/12: 850 MGD  (1310 cfs)

    Little Falls gage flow 09/13: 890 MGD (est., based on recently available real time data)  (1370 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/12: 1250 MGD (1940 cfs)

    Point of Rocks flow 09/13: 1290 MGD (est., based on recently available real time data) (2000 cfs)

Net Potomac Production yesterday (09/12/16):

    FW Corbalis raw water withdrawal (Potomac): 132 MGD

    WSSC Potomac Production: 127 MGD

    Aqueduct withdrawal: 151 MGD

    Total Potomac demand: 410 MGD


Daily Potomac flow and demand update (Monday 09/12/2016)

According to the MARFC's multi-sensor precipitation estimate (MPE), no rain fell in the Potomac basin over the past 24 hours. Almost no rain is expected over the next 72 hours according to MARFC's quantitative precipitation forecasts (QPF).

Daily Flows:

        Little Falls gage flow 09/11: 850 MGD  (1310 cfs)

        Little Falls gage flow 09/12: 840 MGD (est., based on recently available real time data)  (1300 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 09/11: 1160 MGD (1790 cfs)

        Point of Rocks flow 09/12: 1230 MGD (est., based on recently available real time data) (1910 cfs)

Net Potomac Production yesterday (09/11/16):

        FW Corbalis raw water withdrawal (Potomac): 126 MGD

        WSSC Potomac Production: 127 MGD

        Aqueduct withdrawal: 149 MGD

        Total Potomac demand: 402 MGD


Daily Potomac flow and demand update (Sunday 09/11/2016)

Little rain fell on the basin over the past 24 hours. No rain is expected over the next 72 hours according to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts.

Daily Flows:

    Little Falls gage flow 09/10: 890 MGD  (1380 cfs)

    Little Falls gage flow 09/11: 890 MGD (est., based on recently available real time data)  (1370 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/10: 1080 MGD (1670 cfs)

    Point of Rocks flow 09/11: 1150 MGD (est., based on recently available real time data) (1780 cfs)

Net Potomac Production yesterday (09/10/16):

    FW Corbalis raw water withdrawal (Potomac): 122 MGD

    WSSC Potomac Production: 128 MGD

    Aqueduct withdrawal: 157 MGD

    Total Potomac demand: 407 MGD


Daily Potomac flow and demand update (Saturday 09/10/2016)

Over the past 24 hours, accumulations of rain of up to an inch were recorded in scattered areas, in the northwestern portion of the basin. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between zero and 1/2 of an inch is expected over the next 72 hours, mainly in the northern portion of the basin.

Daily Flows:
   Little Falls gage flow 09/09: 1130 MGD  (1750 cfs)
   Little Falls gage flow 09/10: 910 MGD (est., based on recently available real time data)  (1410 cfs)
         Note: Gage flow at Little Falls is measured after water supply withdrawals.
   Point of Rocks flow 09/09: 1070 MGD (1650 cfs)
   Point of Rocks flow 09/10: 1100 MGD (est., based on recently available real time data) (1700 cfs)


Net Potomac Production yesterday (09/09/16):

   FW Corbalis raw water withdrawal (Potomac): 131 MGD
   WSSC Potomac Production: 118 MGD
   Aqueduct withdrawal: 166 MGD
   Total Potomac demand: 415 MGD



Daily Potomac flow and demand update (Friday 09/09/2016)

No rain fell on the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between zero and 3/4 of an inch is expected over the next 72 hours.  The largest amounts of rainfall are expected for the northwestern portion of the basin.

Daily Flows:

    Little Falls gage flow 09/08: 1130 MGD  (1750 cfs)

    Little Falls gage flow 09/09: 980 MGD (est., based on recently available real time data)  (1520 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/08: 1070 MGD (1650 cfs)

    Point of Rocks flow 09/09: 1140 MGD (est., based on recently available real time data) (1760 cfs)

Net Potomac Production yesterday (09/08/16):

    FW Corbalis raw water withdrawal (Potomac): 110 MGD

    WSSC Potomac Production: 120 MGD

    Aqueduct withdrawal: 157 MGD

    Total Potomac demand: 387 MGD


Daily Potomac flow and demand update (Thursday 09/08/2016)

Significant accumulations of rain, of up to an inch or more, fell in a few scattered areas of the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between 1/10 and 1/2 of an inch is expected over much of the basin over the next 72 hours.

Daily Flows:

        Little Falls gage flow 09/07: 920 MGD  (1430 cfs)

        Little Falls gage flow 09/08: 1170 MGD (est., based on recently available real time data)  (1810 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 09/07: 1010 MGD (1570 cfs)

        Point of Rocks flow 09/08: 1050 MGD (est., based on recently available real time data) (1620 cfs)

Net Potomac Production yesterday (09/07/16):

        FW Corbalis raw water withdrawal (Potomac): 125 MGD

        WSSC Potomac Production: 127 MGD

        Aqueduct withdrawal: 166 MGD

        Total Potomac demand: 418 MGD

We would like to note a correction in the Potomac production values reported yesterday. Aqueduct's withdrawal was 152 MGD instead of 167 MGD, and total Potomac withdrawal was 389 MGD instead of 404 MGD.


Daily Potomac flow and demand update (Wednesday 09/07/2016)

Little rain fell on the basin over the past 24 hours. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between zero and 3/4 of an inch is expected throughout the basin over the next 72 hours.

Daily Flows:

    Little Falls gage flow 09/06: 870 MGD  (1340 cfs)

    Little Falls gage flow 09/07: 890 MGD (est., based on recently available real time data)  (1370 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/06: 1060 MGD (1640 cfs)

    Point of Rocks flow 09/07: 1050 MGD (est., based on recently available real time data) (1620 cfs)

Net Potomac Production yesterday (09/06/16):

    FW Corbalis raw water withdrawal (Potomac): 112 MGD

    WSSC Potomac Production: 125 MGD

    Aqueduct withdrawal: 167 MGD

    Total Potomac demand: 404 MGD


Daily Potomac flow and demand update (Tuesday 09/06/2016)

Negligible amounts of rain fell in the Potomac basin during the past day. According to the Middle Atlantic River Forecast Center's quantitative precipitation forecasts, between zero and 1/10 of an inch is expected throughout the basin over the next 72 hours.

Daily Flows:

        Little Falls gage flow 09/05: 920 MGD  (1430 cfs)

        Little Falls gage flow 09/06: 890 MGD (est., based on recently available real time data)  (1370 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 09/05: 1110 MGD (1710 cfs)

        Point of Rocks flow 09/06: 1100 MGD (est., based on recently available real time data) (1700 cfs)

Net Potomac Production yesterday (09/05/16):

        FW Corbalis raw water withdrawal (Potomac): 132 MGD

        WSSC Potomac Production: 123 MGD

        Aqueduct withdrawal: 148 MGD

        Total Potomac demand: 402 MGD


Daily Potomac flow and demand update (Monday 09/05/2016)

Dry conditions continue in our area. According to the National Weather Service's Middle Atlantic River Forecast Center (MARFC), no rain fell in the Potomac basin over the past 24 hours and no rain is expected for the next 72 hours.

Daily Flows:

        Little Falls gage flow 09/04: 1020 MGD  (1580 cfs)

        Little Falls gage flow 09/05: 940 MGD (est., based on recently available real time data)  (1450 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 09/04: 1070 MGD (1650 cfs)

        Point of Rocks flow 09/05: 1110 MGD (est., based on recently available real time data) (1720 cfs)

Net Potomac Production yesterday (09/04/16):

        FW Corbalis raw water withdrawal (Potomac): 113 MGD

        WSSC Potomac Production: 116 MGD

        Aqueduct withdrawal: 137 MGD

        Total Potomac demand: 315 MGD


Daily Potomac flow and demand update (Sunday 09/04/2016)

Small, scattered portions of the basin received trace amounts of rain yesterday. No rain is expected over the next 72 hours according to MARFC.

Daily Flows:

    Little Falls gage flow 09/03: 1190 MGD  (1840 cfs)

    Little Falls gage flow 09/04: 1090 MGD (est., based on recently available real time data)  (1680 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/03: 1090 MGD (1680 cfs)

    Point of Rocks flow 09/04: 1090 MGD (est., based on recently available real time data) (1680 cfs)

Net Potomac Production yesterday (09/03/16):

    FW Corbalis raw water withdrawal (Potomac): 92 MGD

    WSSC Potomac Production: 111 MGD

    Aqueduct withdrawal: 146 MGD

    Total Potomac demand: 349 MGD


Daily Potomac flow and demand update (Saturday 09/03/2016)

Negligible precipitation fell in the basin above Little Falls yesterday. Despite the presence of Tropical Storm Hermine, very little rain is in the forecast for the next 72 hours except for the far western edge of the watershed, which is expected to receive up to 1/4 inch.

Daily Flows:

        Little Falls gage flow 09/02: 1450 MGD  (2240 cfs)

        Little Falls gage flow 09/03: 1310 MGD (est., based on recently available real time data)  (2030 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 09/02: 1120 MGD (1730 cfs)

        Point of Rocks flow 09/03: 1110 MGD (est., based on recently available real time data) (1720 cfs)

Net Potomac Production yesterday (09/02/16):

        FW Corbalis raw water withdrawal (Potomac): 103 MGD

        WSSC Potomac Production: 108 MGD

        Aqueduct withdrawal: 143 MGD

        Total Potomac demand: 354 MGD


Daily Potomac flow and demand update (Friday 09/02/2016)

Little rain fell in the basin yesterday. Over the next 72 hours, no rain is expected over much of the basin. The far eastern portion of the basin may receive up to half an inch of rain according to MARFC.

Daily Flows:

    Little Falls gage flow 09/01: 1000 MGD  (1540 cfs)

    Little Falls gage flow 09/02: 1580 MGD (est., based on recently available real time data)  (2450 cfs)

          Note: Gage flow at Little Falls is measured after water supply withdrawals.

    Point of Rocks flow 09/01: 1140 MGD (1770 cfs)

    Point of Rocks flow 09/02: 1140 MGD (est., based on recently available real time data) (1760 cfs)

Net Potomac Production yesterday (09/01/16):

    FW Corbalis raw water withdrawal (Potomac): 100 MGD

    WSSC Potomac Production: 65 MGD

    Aqueduct withdrawal: 152 MGD

    Total Potomac demand: 317 MGD


Daily Potomac flow and demand update (Thursday 09/1/2016)

Today CO-OP is initiating daily drought monitoring. Potomac River flow at Point of Rocks is below CO-OP's daily monitoring trigger of 2000 cfs. The USGS revised the Point of Rocks stage-discharge rating curve on Tuesday, and daily flows are now reported to have been below 2000 cfs for the past several days. According to National Weather Service's quantitative precipitation forecasts, little precipitation is expected in the basin over the next 3 days.

 

Daily Flows:

        Little Falls gage flow 08/31: 950 MGD  (1470 cfs)

        Little Falls gage flow 09/01: 980 MGD (est., based on recently available real time data)  (1520 cfs)

              Note: Gage flow at Little Falls is measured after water supply withdrawals.

        Point of Rocks flow 08/31: 1160 MGD (1790 cfs)

        Point of Rocks flow 09/01: 1180 MGD (est., based on recently available real time data) (1820 cfs)

Net Potomac Production yesterday (08/31/16):

        FW Corbalis raw water withdrawal (Potomac): 137 MGD

        WSSC Potomac Production: 126 MGD

        Aqueduct withdrawal: 165 MGD

        Total Potomac demand: 428 MGD