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Summary of May 2005 Monthly Hydrologic Conditions

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

May 2005

Precipitation was below normal the Newark and Trenton index stations, and above normal at the Atlantic City index station. Newark reported 1.21 inches, which is 27.1 percent of normal. Trenton reported 1.35 inches, which is 36.0 percent of normal. Atlantic City reported 3.53 inches, which is 104 percent of normal. Total precipitation over the past 12 months was 47.24 inches at Newark which is 0.99 inches above normal, 46.29 inches at Trenton which is 4.90 inches above normal, and 41.78 inches at Atlantic City which is 1.19 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of May 31 was 75.32 billion gallons, which is 93.7 percent of capacity. The storage was 3.67 billion gallons less than one month ago and 3.83 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 below normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 92.7 ft³/s, 54.2 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 86.7 ft³/s, 85.0 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 9,380 ft³/s, 60.9 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on May 31 was 6,000 ft³/s.

Groundwater levels on May 31, as measured in water-table observation wells, were below normal at Readington School 11 index well, and above normal at Morrell 1 and Vocational School 2 index wells. Levels decreased from last month at all three index wells. Levels were lower than one year ago at Readington School 11 and Vocational School 2 index wells, and higher than one year ago at Morrell 1 index well.

Water quality parameters from the Delaware River at Trenton are not available this month.

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