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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/772

Title: Rainfalls of 12 July 2004 in New Jersey
Authors: Weggel, J. Richard
Keywords: Rainfall anomalies--New Jersey--Charts, diagrams, etc.;Rainfall probabilities
Issue Date: Sep-2004
Citation: Retrieved 3/15/2006 from http://www.pages.drexel.edu/~weggel/Rainfalls%20of%2012%20July%202004%20in%20New%20Jersey.pdf.
Abstract: The recent rainfalls in southern New Jersey appear to have broken all records. Rainfall at Tabernacle, NJ was reported at 11 inches. If this much rainfall fell during a 24-hour period, it would be the 5,000-year event for the southern New Jersey - Philadelphia area. That is, on average – over many millennia – this much rainfall could be expected to occur once in 5,000 years. A better way to express it is that it would have a probability of 1/5000 = .0002 or a 0.000002% chance of occurring in any one year. The graph below shows the return period of rainfalls for various durations ranging from ½ hour to 24 hours. For example, the 100-year, 24-hour rainfall for the Philadelphia area is about 7 inches. If those 7 inches fell in only 12 hours, it would be a 250-year rainfall; if it fell in 3 hours, it would exceed the 1,000-year rainfall. Thus, if the 11 inches at Tabernacle fell in less than 24 hours, say 12 hours, its return period would exceed the 10,000-year point rainfall. The data used to create the graph is from the Weather Bureau’s (now the National Weather Service) Technical Paper # 40, “Rainfall Frequency Atlas of the United States,” by David Hershfield, May 1961. Note that the lines have been extrapolated out quite far from the original data used to create the graph; hence, these return periods are very approximate!!
URI: http://hdl.handle.net/1860/772
Appears in Collections:Faculty Research and Publications (CAEE)

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