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SUMMARY ARCHIVES

Summary of September 2014 Monthly Hydrologic Conditions

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

September 2014

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

Precipitation was below normal at the Trenton and Newark index stations, and above the normal at the Atlantic City index station for the reference period 1981-2010. Newark reported 1.52 inches, which is ­­­­39.79 percent of normal.  Atlantic City reported 3.52 inches, which is 111.75 percent of normal.  Trenton reported 1.05 inches, which is 24.59 percent of normal. Total precipitation over the past 12 months was: 44.24 inches at Newark, which is 2.01 inches below normal; 53.76 inches at Atlantic City, which is 12.01 inches above normal; and 41.80 inches at Trenton, which is 4.64 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of September 30 was 47.744 billion gallons (59.0 percent of capacity), which is lower than the average September contents for the reference period 1961-1990.  The storage was 11.799 billion gallons less than one month ago and 14.915 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 below the long-term monthly-mean for the reference period 1981-2010 at the South Branch Raritan River near High Bridge and the Delaware River at Trenton index stations, and above the long-term monthly-mean for the Great Egg Harbor River at Folsom index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 25.5 ft3/s, 36.4 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 92.7 ft3/s, 177.9 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 3,297 ft3/s, 45.5 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on September 30 was 3,000 ft3/s.

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

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 17.2 to 27.4 degrees Celsius. Dissolved oxygen ranged from 7.9 to 10.5 milligrams per liter. Specific conductance ranged from 240 to 293 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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