Abstract

There has been much discussion regarding global climate change and potential impacts to the environment. One suggested impact of climate change is increasing storm intensity. Changes in rainfall intensity could significantly alter the accuracy of current stormwater management designs. Civil engineers and community planners use historical precipitation data and statistically generated models to design stormwater management facilities. It is not uncommon for civil engineers to design stormwater management facilities using models that are based on precipitation data published more than 50 years ago. The design of stormwater facilities is largely based on the amount of runoff generated from a design storm event. Rainfall intensities and depths for various storm frequencies are determined using local Intensity-Duration-Frequency (IDF) curves and isohyetal maps, respectively. The IDF curves currently in use in Rochester, New York were originally published in 1955 and generated using approximately 40 years of data. Approximately 55 years of additional precipitation data is now available. The purpose of this paper is to: 1) evaluate and report trends in precipitation observed at the Greater Rochester International Airport; and 2) Generate updated Intensity-Duration-Frequency (IDF) curves and compare these to existing IDF curves. This paper will use Rochester, New York as a case study.

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