Spatial Attenuation of Major Pennsylvania Storms

by David J. Wall, Pennsylvania State Univ, University, Park, PA, USA,
Gert Aron, Pennsylvania State Univ, University, Park, PA, USA,
David Kotz, Pennsylvania State Univ, University, Park, PA, USA,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


To utilize point estimates for more expansive areas, reduction factors are necessary to account for the attenuation of storm magnitude with increasing area. The spatial attenuation of major storms in Pennsylvania was investigated using rainfall data obtained from the National Climatic Data Center for the statewide network of raingages and from the Agricultural Research Service for the dense network of raingages on the Mahantango experimental watershed in east central Pennsylvania. Individual storms of 1, 2, 3, 6, 12 and 24 hour durations were analyzed using a Thiessen polygon weighting technique. The results of the individual storm analyses were then averaged to obtain relative storm magnitude versus area relationships for two levels of gage network density.

Subject Headings: Rain water | Storms | Information management | Weather forecasting | Spatial data | Rainfall | Hydrologic data | Irrigation water | Pennsylvania | United States

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