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SUMMARY ARCHIVES

Summary of February 2015 Monthly Hydrologic Conditions

Compiled in cooperation with the New Jersey Department of Environmental Protection
Provisional assessment of hydrologic conditions in New Jersey

February 2015

Map of New Jersey showing sites where hydrologic conditions are reported.

Precipitation was below normal at all three index stations for the reference period 1981-2010. Newark reported 2.06 inches, which is ­­­­71.53 percent of normal.  Atlantic City reported 2.78 inches, which is 96.86 percent of normal.  Trenton reported 2.25 inches, which is 97.40 percent of normal. Total precipitation over the past 12 months was: 48.09 inches at Newark, which is 1.84 inches above normal; 53.87 inches at Atlantic City, which is 12.12 inches above normal; and 42.92 inches at Trenton, which is 3.52 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of February 28 was 59.905 billion gallons (74.1 percent of capacity), which is lower than the average February contents for the reference period 1961-1990.  The storage was 1.349 billion gallons less than one month ago and 2.122 billion gallons less than one year ago.  The thirteen major water supply reservoirs are as follows: Lake Tappan, Woodcliff Lake, Oradell Reservoir, DeForest Lake, Splitrock Reservoir, Boonton Reservoir, Canistear Reservoir, Oak Ridge Reservoir, Clinton Reservoir, Charlotteburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.

Streamflow was above the long-term monthly-mean for the reference period 1981-2010 at the Great Egg Harbor River at Folsom index station and below the long-term monthly-mean at the South Branch Raritan River near High Bridge and Delaware River at Trenton index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 47.3 ft3/s, 30.7 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 111 ft3/s, 109.9 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 3,942 ft3/s, 29.6 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on February 28 was estimated to be 3,680 ft3/s.

Groundwater levels, as measured in water-table observation wells for the month of February, were above normal at the Morrell 1 and Vocational School 2 index wells, and below normal at the Readington School 11 index well. Levels decreased from last month, and were lower than one year ago.

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 0.2 to 3.3 degrees Celsius. Dissolved oxygen ranged from 14.1 to 16.9 milligrams per liter. Specific conductance ranged from 275 to 376 microsiemens per centimeter at 25°C.

Note: The preceding data is preliminary and subject to revision.


All of the files listed below are in Portable Document Format (PDF) which can be viewed/printed with the Adobe Acrobat® Reader, freely available for most computer platforms.

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