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Summary of October 2007 Monthly Hydrologic Conditions

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

October 2007

Precipitation was above normal at all three index stations. Newark reported 3.70 inches, which is 117 percent of normal. Atlantic City reported 4.76 inches, which is 166 percent of normal. Trenton reported 4.37 inches, which is 167 percent of normal. Total precipitation over the past 12 months was: 56.50 inches at Newark, which is 10.25 inches above normal; 41.62 inches at Atlantic City, which is 1.03 inches above normal; and 44.59 inches at Trenton, which is 3.20 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of October 31 was 48.9 billion gallons (60.8 percent of capacity), which is less than the average October contents for the reference period 1961-1990. The storage was 0.40 billion gallons more than one month ago and 24.2 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, Charlottesburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.

Streamflow was above normal at the South Branch Raritan River near High Bridge index gage, below normal at the Great Egg Harbor River at Folsom index gage, and just slightly below normal at the Delaware River at Trenton index gage. The monthly-mean discharge at South Branch Raritan River near High Bridge was 127 ft³/s, 142 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 41.1 ft³/s, 65.6 percent of normal. On October 1, the lowest daily mean at Great Egg Harbor River at Folsom was 22 ft³/s, which was close to the October record low of 20 cfs, set in 2003. The monthly mean discharge of the Delaware River at Trenton was 7,870 ft³/s, 96.7 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on October 31 was 17,200 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, but were lower than one year ago at all three index wells.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 11.0 to 24.1 degrees Celsius. Dissolved oxygen ranged from 7.7 to 11.8 milligrams per liter. Specific conductance ranged from 125 to 248 microsiemens per centimeter at 25°C.

All of the files listed below are in Portable Document Format (PDF) which can be viewed/printed with the Adobe Acrobat® Reader, freely available for most computer platforms.

• Combined Storage in the 13 Major Water Supply Reservoirs
• Monthly precipitation at three selected sites
• Groundwater levels in selected Water-table observation wells
• Streamflow at selected sites
• Water quality for the Delaware River at Trenton