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Summary of November 2011 Monthly Hydrologic Conditions

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

November 2011

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

Precipitation was above normal at the Trenton and Atlantic City index stations and below normal for the Newark index station for the reference period 1981-2010. Newark reported 3.53 inches, which is ­­­­96.71 percent of normal.  Atlantic City reported 4.52 inches, which is 138.23 percent of normal.  Trenton reported 3.97 inches, which is 119.94 percent of normal. Total precipitation over the past 12 months was: 69.28 inches at Newark, which is 23.03 inches above normal; 48.57 inches at Atlantic City, which is 6.82 inches above normal; and 59.25 inches at Trenton, which is 12.81 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of November 30 was 79.523 billion gallons (98.3 percent of capacity), which is higher than the average November contents for the reference period 1961-1990.  The storage was 0.926 billion gallons more than one month ago and 24.318 billion gallons more 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 all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 224 ft3/s, 204 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 127 ft3/s, 177 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 18,990 ft3/s, 170 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on November 30 was 29,900 ft3/s.

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

Water-quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 6.8 to 9.6 degrees Celsius. Dissolved oxygen ranged from 11.2 to 14.5 milligrams per liter. Specific conductance ranged from 127 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.

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