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SUMMARY ARCHIVES

Summary of August 2014 Monthly Hydrologic Conditions

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

August 2014

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

Precipitation was below normal at the Newark and Trenton index stations, and above normal at the Atlantic City index station for the reference period 1981-2010. Newark reported 1.76 inches, which is 47.57 percent of normal.  Atlantic City reported 9.91 inches, which is 241.12 percent of normal.  Trenton reported 3.46 inches, which is 84.39 percent of normal. Total precipitation over the past 12 months was: 44.26 inches at Newark, which is 1.99 inches below normal; 51.42 inches at Atlantic City, which is 9.67 inches above normal; and 42.36 inches at Trenton, which is 4.08 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of August 31 was 59.544 billion gallons (73.6 percent of capacity), which is more than the average August contents for the reference period 1961-1990.  The storage was 11.255 billion gallons less than one month ago and 8.789 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 Delaware River at Trenton index stations, but above the long-term monthly-mean at the Great Egg Harbor River at Folsom index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 37.3 ft3/s, 55.8 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 83.1 ft3/s, 155.0 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 4,315 ft3/s, 70.7 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on August 31 was 3,220 ft3/s.

Groundwater levels, as measured in water-table observation wells for the month of August, 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, and 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 19.6 to 24.8 degrees Celsius. Dissolved oxygen ranged from 8.1 to 9.7 milligrams per liter. Specific conductance ranged from 243 to 266 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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