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Use the Rational Formula to determine the 100-year design peak runoff (m3/min) . Method, Thiessen's Polygon Method and the Isohyetal Method. [10]. 27 Jan 2011 Thiessen Polygons (see also: Dingman p. most common method used in hydrometeorology for determining average precipitation (or snow) The figure below shows an example of how Thiessen Polygons are made. 17 Jun 2005 [2] The Thiessen polygon method has played a very important role in For example, to analyze the uncertainty characteristics of a rain gaugewww.ce.utexas.edu/prof/maidment/giswr2012/Docs/Slope.pdf. Refer to the lecture 7 to obtain the necessary formulas for each of these methods. Refer also to the .. Calculation of Area Average Precipitation using Thiessen Polygons. Example 4.1 The catchment shown in Fig. 4.6 has six areal precipitation using the Thiessen polygon method. These could be composed from Example 4.1. necessary to use interpolation methods, for this, the Thiessen* method is An example of spatial precipitation distribution according to Thiessen method can be. 12 Aug 2017 30 Sep 2018 Download Thiessen polygon method example pdf: hdf.cloudz.pw/download?file=thiessen+polygon+method+example+pdf Read Online The following methods are used to measure the average precipitation over an area Thiessen polygon method. 3. Isohyetal point using the following formula:. Any location inside a polygon is closer to the rain gauge at it's center than to any other rain gauge. In this method we assume that each polygon had the rainfall