Date: Wed, 16 Apr 2014 14:23:10 EDT
Summary: Major and Moderate Flooding in Northern New York
Major and Moderate flooding continues in northern New York as a result of runoff from a deep snow pack in the Adirondack Mountains. Hard hit areas include the Schroon R, Upper Hudson R, Upper Mohawk R, Black R, Raquette R, St Regis R, Oswegatchie R, and Lake Champlain basins. Major flooding is occurring along the Schroon R at Riverbank, NY. The gage is forecast to crest later today with a provisional annual exceedance probability (AEP) of about 10% (10-year recurrence interval). The provisional AEP’s in the remaining basins generally range from of 10% to 2% (10-yr to 50yr recurrence intervals). A new provisional peak discharge was established at W Br St Regis R nr Parishville on April 15 (6,290 cfs) with a provisional AEP of 1% (100-yr flood). The gage has been in operation since 1958 (55-yrs of record). Many streams are now receding, except for the Schroon R and the lower reaches along the Black R, Mohawk R, and Upper Hudson R. Last night’s subfreezing temperatures and snowfall have reduced snowmelt. Six USGS crews
(12 staff members) from the Troy, NY and Potsdam, NY offices of the New York Water Science Center have made about 30 discharge measurements during the past two days to document the conditions and calibrate stage-discharge relationships at USGS streamgages.