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Summary of July 2002 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 2002

Precipitation was below normal at all three index stations. Newark reported 1.19 inches, which is 25.4 percent of normal. Atlantic City reported 1.07 inches, which is 27.7 percent of normal. Trenton reported 0.60 inches, which is 14.0 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of July 31 was 61.1 billion gallons, which is 76.0 percent of capacity. The storage was 8.96 billion gallons less than one month ago and 9.16 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 37.3 ft³/s, 43.6 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 29.0 ft³/s, 43.6 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 3,990 ft³/s, 58.7 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on July 31 was 3,240 ft³/s.

Groundwater levels, as measured in water-table observation wells, were below normal at all three index wells.

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