New Jersey Water Science Center
Summary of January 2015 Monthly Hydrologic Conditions
Compiled in cooperation with the New Jersey Department of Environmental Protection
Precipitation was above normal at all three index stations for the reference period 1981-2010. Newark reported 4.42 inches, which is 124.86 percent of normal. Atlantic City reported 5.28 inches, which is 163.96 percent of normal. Trenton reported 4.34 inches, which is 137.34 percent of normal. Total precipitation over the past 12 months was: 50.97 inches at Newark, which is 4.72 inches above normal; 56.39 inches at Atlantic City, which is 14.64 inches above normal; and 45.06 inches at Trenton, which is 1.38 inches below normal.
Combined storage in the thirteen major water supply reservoirs as of January 31 was 61.254 billion gallons (75.7 percent of capacity), which is higher than the average January contents for the reference period 1961-1990. The storage was 5.523 billion gallons higher than one month ago and 0.595 billion gallons higher 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 Great Egg Harbor River at Folsom and Delaware River at Trenton index stations, and below the long-term monthly-mean at the South Branch Raritan River near High Bridge index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 118 ft3/s, 78.1 percent of the long-term mean. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 158 ft3/s, 160.4 percent of the long-term mean. The monthly mean discharge of the Delaware River at Trenton was 17,070 ft3/s, 126.9 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on January 31 was 5,580 ft3/s.
Groundwater levels, as measured in water-table observation wells for the month of January, were above normal at all three index wells. Levels increased from last month and were higher than one year ago at the Morrell 1 and Vocational School 2 index wells. Levels decreased from last month and were lower 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. Water temperature ranged from 0.1 to 2.5 degrees Celsius. Dissolved oxygen ranged from 11.4 to 14.3 milligrams per liter. Specific conductance ranged from 152 to 256 microsiemens per centimeter at 25°C.
Note: The preceding data is preliminary and subject to revision.
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