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The following Public Information Statement is an announcement for changes to the Cannonsville and Neversink Reservoir flood stages on the National Weather Service (NWS) Advanced Hydrologic Prediction Services (AHPS) web site.



On Friday December 29, 2006, the flood stages posted on the National Weather Service (NWS) Binghamton`s Advanced Hydrologic Prediction Services (AHPS) for Cannonsville and Neversink reservoirs will change. These new reservoir flood stages will provide a better indication when minor flooding is developing downstream of the New York City water supply reservoirs at Cannonsville and Neversink.

At Cannonsville, the reservoir begins spilling at an elevation of 1150.0 feet above mean sea level (msl). the present Advanced Hydrologic Prediction Services (AHPS) flood stage is 1152.0 ft msl. At 1152.0 ft msl, the discharge over the spillway into the West Branch Delaware is 2200 cubic feet per second (cfs). The new AHPS flood stage will become 1153.0 ft msl. This new flood stage is a discharge of 4200 cfs into the West Branch Delaware below the dam. This discharge does not cause flooding, but it is significant, especially when there is local runoff from heavy rain or snowmelt occurring below the reservoir.

At Neversink, the reservoir begins spilling at an elevation of 1440.0 feet mean sea level (msl). The present Advanced Hydrologic Prediction Services (AHPS) flood stage is 1441.0 ft msl. at 1441.0 ft msl, the discharge over the spillway into the Neversink River is 1800 cubic feet per second (cfs). The new AHPS flood stage will become 1441.5 ft msl. This new flood stage is a discharge of 3400 cfs into the Neversink River below the dam. This discharge does not cause flooding, but it is significant, especially when there is local runoff from heavy rain or snowmelt occurring below the reservoir.

At Pepacton Reservoir, the Advanced Hydrologic Prediction Services (AHPS) flood stage will not change. The reservoir begins spilling at 1280.0 feet mean sea level (msl) elevation. The present AHPS flood stage is 1281.0 feet msl. At 1281.0 ft, the discharge over the spillway into the East Branch Delaware is 2500 cubic feet per second (cfs). When Pepacton Reservoir reaches 1281.1 feet or 3000 cfs, Island Road in Shinhopple begins to flood, therefore no change is needed to the AHPS flood stage at Pepacton reservoir.

For further information about these flood stage changes contact, John Chiaramonte, Service Hydrologist, at john.chiaramonte@noaa.gov or 607-770-9531 extension 234. Your questions and comments are appreciated.

National Weather Service
Binghamton Weather Forecast Office
32 Dawes Drive
Johnson City, NY 13790
(607) 729-1597
Page last modified: November 11, 2006
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