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Summary of July 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.

July 2004

Precipitation was above normal at all three index stations. Newark reported 8.39 inches, which is 179 percent of normal. Atlantic City reported 5.21 inches, which is 135 percent of normal. Trenton reported 7.41 inches, which is 173 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of July 31 was 75.0 billion gallons, which is 93.3 percent of capacity. The storage was 0.33 billion gallons less than one month ago and 0.08 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 the High Bridge index station, and above normal at the Folsom and Trenton index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 80.2 ft³/s, 87.5 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 70.0 ft³/s, 107 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 8,174 ft³/s, 112 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on July 31 was 15,900 ft³/s.

Groundwater levels, as measured in water-table observation wells, were above normal at all three index wells. Levels increased from last month and were higher than one year ago at all three index stations.

Water quality parameters collected at Delaware River at Trenton were within limits of recorded historic extremes.

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