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Summary of May 2004 Monthly Hydrologic Conditions

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

The following pages are adapted for online release from a summary of hydrologic condions for the previous month.

May 2004

Precipitation was above normal at Newark, and below normal at Trenton and Atlantic City. Newark reported 4.60 inches, which is 103 percent of normal. Atlantic City reported 3.31 inches, which is 97.9 percent of normal. Trenton reported 2.56 inches, which is 68.3 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of May 31 was 79.2 billion gallons, which is 98.4 percent of capacity. The storage was 0.13 billion gallons more than one month ago and 0.72 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 127 ft³/s, 74.3 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 92.8 ft³/s, 91.0 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 14,730 ft³/s, 95.6 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on May 31 was 12,000 ft³/s.

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

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