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SUMMARY ARCHIVES

Summary of July 2014 Monthly Hydrologic Conditions

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

July 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 5.10 inches, which is 107.14 percent of normal.  Atlantic City reported 5.09 inches, which is 136.83 percent of normal.  Trenton reported 5.43 inches, which is 109.70 percent of normal. Total precipitation over the past 12 months was: 47.07 inches at Newark, which is 0.82 inches above normal; 44.44 inches at Atlantic City, which is 2.69 inches above normal; and 42.83 inches at Trenton, which is 3.61 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of July 31 was 70.798 billion gallons (87.5 percent of capacity), which is higher than the average July contents for the reference period 1961-1990.  The storage was 3.697 billion gallons less than one month ago and 2.952 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 above the long-term monthly-mean for the reference period 1981-2010 at the South Branch Raritan River at High Bridge and Delaware River at Trenton index stations, but below 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 87.8 ft3/s, 105.3 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 60.8 ft3/s, 99.2 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 9,774 ft3/s, 138.8 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on July 31 was 5220 ft3/s.

Groundwater levels, as measured in water-table observation wells for the month of July, were above normal at all three index wells. Levels decreased from last month, and were lower than one year ago.

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 22.8 to 26.7 degrees Celsius. Dissolved oxygen ranged from 8.0 to 9.2 milligrams per liter. Specific conductance ranged from 143 to 216 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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