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Summary of October 2015 Monthly Hydrologic Conditions

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

October 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 3.35 inches, which is 93.06 percent of normal.  Atlantic City reported 3.39 inches, which is 99.12 percent of normal.  Trenton reported 3.95 inches, which is 94.50 percent of normal. Total precipitation over the past 12 months was: 42.42 inches at Newark, which is 3.83 inches below normal; 50.05 inches at Atlantic City, which is 8.30 inches above normal; and 41.77 inches at Trenton, which is 4.67 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of October 31 was 45.932 billion gallons (56.8 percent of capacity), which is less than the average October contents for the reference period 1961-1990.  The storage was 0.802 billion gallons less than one month ago and 0.513 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 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 40.2 ft3/s, 45.8 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 56.3 ft3/s, 94.3 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 5,659 ft3/s, 66.7 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on October 31 was 20,000 ft3/s.

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

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values, except for a new high in specific conductance.  Water temperature ranged from 10.9 to 21.8 degrees Celsius. Dissolved oxygen ranged from 8.0 to 12.5 milligrams per liter. Specific conductance ranged from 148 to 318 microsiemens per centimeter at 25°C.

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

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