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Summary of August 2015 Monthly Hydrologic Conditions

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

August 2015

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

Precipitation was below normal at all three index stations for the reference period 1981-2010. Newark reported 1.40 inches, which is 37.84 percent of normal.  Atlantic City reported 1.25 inches, which is 30.41 percent of normal.  Trenton reported 2.62 inches, which is 63.90 percent of normal. Total precipitation over the past 12 months was: 42.41 inches at Newark, which is 3.84 inches below normal; 51.80 inches at Atlantic City, which is 10.05 inches above normal; and 38.65 inches at Trenton, which is 7.79 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of August 31 was 55.006 billion gallons (68.0 percent of capacity), which is less than the average August contents for the reference period 1961-1990.  The storage was 13.019 billion gallons less than one month ago and 4.538 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 all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 31.5 ft3/s, 47.2 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 40.1 ft3/s, 74.8 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 5,341 ft3/s, 87.6 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on August 31 was 4,160 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, and 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 22.8 to 29.0 degrees Celsius. Dissolved oxygen ranged from 7.1 to 9.9 milligrams per liter. Specific conductance ranged from 194 to 265 microsiemens per centimeter at 25°C.

Note: The preceding data is preliminary and subject to revision.

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