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Summary of November 2012 Monthly Hydrologic Conditions

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

November 2012

Precipitation was below normal at all three index stations for the reference period 1981-2010. Newark reported 1.62 inches, which is ;­44.38 percent of normal.  Atlantic City reported 1.34 inches, which is 40.98 percent of normal.  Trenton reported 1.18 inches, which is 35.65 percent of normal. Total precipitation over the past 12 months was: 35.80 inches at Newark, which is -10.45 inches below normal; 44.91 inches at Atlantic City, which is 3.16 inches above normal; and 37.65 inches at Trenton, which is -8.79 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of November 30 was 62.208 billion gallons (76.9 percent of capacity), which is more than the average November contents for the reference period 1961-1990.  The storage was 0.731 billion gallons more than one month ago and -17.315 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 at the Great Egg Harbor River at Folsom index station was above the long-term monthly-mean for the reference period 1981-2010, while South Branch Raritan river near High Bridge and Delaware River at Trenton index Stations were below the long-term monthly-mean. The monthly-mean discharge at South Branch Raritan River near High Bridge was 68.4 ft³/s, 62.2 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 96.5 ft³/s, 134.6 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 11,150 ft³/s, 99.7 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on November 30 was 6,400 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of November, were above normal at the Vocational School 2 index well, and below normal at the Readington School 11 and Morrell 1 index wells. Levels increased at the Morrell 1 index well and decreased at the Readington School 11 and Vocational School 2 index well from last month. Levels were lower than one year ago at all three index wells.  The water level in feet below landsurface was 23.8 ft at the Readington School 11 index well, 5.49 ft at the Morrell 1 index well, and 5.57 ft at the Vocational School 2 index well on Nov. 30.

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 2.5 to 10.4 degrees Celsius. Dissolved oxygen ranged from 10.8 to 13.9 milligrams per liter. Specific conductance ranged from 117 to 203 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.

• Combined Storage in the 13 Major Water Supply Reservoirs
• Monthly precipitation at three selected sites
• Groundwater levels in selected Water-table observation wells
• Streamflow at selected sites
• Water quality for the Delaware River at Trenton