New Jersey Water Science Center
Summary of July 2016 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 6.08 inches, which is 127.73 percent of normal. Atlantic City reported 8.83 inches, which is 237.37 percent of normal. Trenton reported 7.46 inches, which is 150.71 percent of normal. Total precipitation over the past 12 months was: 35.66 inches at Newark, which is 10.59 inches below normal; 46.54 inches at Atlantic City, which is 4.79 inches above normal; and 39.91 inches at Trenton, which is 6.53 inches below normal.
Combined storage in the thirteen major water supply reservoirs as of July 31 was 60.608 billion gallons (74.9 percent of capacity), which is less than the average July contents for the reference period 1961-1990. The storage was 6.753 billion gallons less than one month ago and 7.417 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 41.5 ft3/s, 49.8 percent of the long-term mean. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 49.3 ft3/s, 80.4 percent of the long-term mean. The monthly mean discharge of the Delaware River at Trenton was 4,699 ft3/s, 66.7 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on July 31 was 8,930 ft3/s.
Groundwater levels, as measured in water-table observation wells for the month of July, were below normal at the Readington School 11 index well, and above normal at the Morrell 1 and Vocational School 2 index wells. Levels increased from last month at the Morrell 1 index well, and decreased from last month at the Readington School 11 and Vocational School 2 index well. Levels were higher than one year ago at the Morrell 1 index well, and lower than one year ago at the Readington School 11 and 1 and Vocational School 2 index wells.
Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 24.0 to 31.2 degrees Celsius. Dissolved oxygen ranged from 6.0 to 11.0 milligrams per liter. Specific conductance ranged from 177 to 268 microsiemens per centimeter at 25°C.
Note: The preceding data is preliminary and subject to revision.
All of the files listed below are in JPEG Format (jpg) which can be viewed/printed from most computer platforms.