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SUMMARY ARCHIVES

Summary of December 2014 Monthly Hydrologic Conditions

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

December 2014

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

Precipitation was above normal at all three index stations for the reference period 1981-2010. Newark reported 4.91 inches, which is 128.87 percent of normal.  Atlantic City reported 5.53 inches, which is 149.86 percent of normal.  Trenton reported 4.14 inches, which is 111.89 percent of normal. Total precipitation over the past 12 months was: 49.33 inches at Newark, which is 3.08 inches above normal; 54.36 inches at Atlantic City, which is 12.61 inches above normal; and 43.99 inches at Trenton, which is 2.45 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of December 31 was 55.730 billion gallons (68.9 percent of capacity), which is less than the average December contents for the reference period 1961-1990.  The storage was 9.929 billion gallons higher than one month ago and 0.131 billion gallons higher 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 103 ft3/s, 67.8 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 150 ft3/s, 153.2 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 10,380 ft3/s, 68.5 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on December 31 was 11,100 ft3/s.

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

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 2.8 to 5.8 degrees Celsius. Dissolved oxygen ranged from 11.6 to 12.6 milligrams per liter. Specific conductance ranged from 154 to 254 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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