New Jersey Water Science Center
Summary of February 2017 Monthly Hydrologic Conditions
Compiled in cooperation with the New Jersey Department of Environmental Protection
Precipitation was below normal at all three index stations for the reference period 1981-2010. Newark reported 2.09 inches, which is 72.57 percent of normal. Atlantic City reported 1.37 inches, which is 47.74 percent of normal. Trenton reported 1.37 inches, which is 59.31 percent of normal. Total precipitation over the past 12 months was: 37.10 inches at Newark, which is 9.15 inches below normal; 43.22 inches at Atlantic City, which is 1.47 inches above normal; and 32.36 inches at Trenton, which is 14.08 inches below normal.
Combined storage in the thirteen major water supply reservoirs as of February 28 was 65.030 billion gallons (80.4 percent of capacity), which is greater than the average February contents for the reference period 1961-1990. The storage was 5.878 billion gallons greater than one month ago and 9.053 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 59.1 ft3/s, 38.4 percent of the long-term mean. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 56.1 ft3/s, 55.5 percent of the long-term mean. The monthly mean discharge of the Delaware River at Trenton was 10,360 ft3/s, 77.7 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on February 28 was 26,300 ft3/s.
Groundwater levels, as measured in water-table observation wells for the month of February, were below normal at the Readington School 11 and Vocational School 2 index wells, and above normal at the Morrell 1 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 except for a new high in water temperature. Water temperature ranged from 1.2 to 9.6 degrees Celsius. Dissolved oxygen ranged from 11 to 14.8 milligrams per liter. Specific conductance ranged from 109 to 275 microsiemens per centimeter at 25°C.
Note: The preceding data is preliminary and subject to revision.
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