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Summary of August 2006 Monthly Hydrologic Conditions

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

August 2006

Precipitation was below normal at all three index stations. Newark reported 2.82 inches, which is 70.1 percent of normal. Atlantic City reported 3.68 inches, which is 85.2 percent of normal. Trenton reported 1.92 inches, which is 50.5 percent of normal. Total precipitation over the past 12 months was: 51.95 inches at Newark, which is 5.70 inches above normal; 46.13 inches at Atlantic City, which is 5.54 inches above normal; and 48.15 inches at Trenton, which is 6.76 inches above normal. At each of the three sites, 74 to 100 percent of the total monthly precipitation fell during the last week of August.

Combined storage in the thirteen major water supply reservoirs as of August 31 was 66.0 billion gallons (82.1 percent of capacity), which is greater than the average August contents for the reference period 1961-1990. The storage was 7.12 billion gallons less than one month ago and 15.2 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, Charlottesburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.

Streamflow was below normal at the South Branch Raritan River near High Bridge and Great Egg Harbor at Folsom index gages, and just above normal at the Delaware River at Trenton index gage. The monthly-mean discharge at High Bridge was 64.4 ft³/s, or 85.4 percent of normal. The monthly-mean discharge at Folsom was 42.8 ft³/s, or 72.8 percent of normal. The monthly-mean discharge at Trenton was 5,644 ft³/s, or 102 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on August 31 was 17,000 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of August, were above normal at the Readington School 11 and Vocational School 2 index wells, and below normal at the Morrell 1 index well. Levels decreased from last month at all three index wells. Compared to one year ago, levels were higher this month 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 20.5 to 29.0 degrees Celsius. Dissolved oxygen ranged from 13.0 to 6.7 milligrams per liter. Specific conductance ranged from 161 to 263 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