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Thiessen Polygon method is a weighted average mean method used to calculate average rainfall. The catchment area is divided into subcatchments using the Thiessen polygon method.

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To calculate rainfall using the Thiessen polygon method, you first need to divide the area into polygons based on rain gauge locations. Then, calculate the area of influence of each rain gauge within its polygon. Finally, you can determine the weight of each rain gauge based on its influence area, which is used to calculate the average rainfall for the entire region.

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Q: How do you calculate rainfall using the thiessen polygon method?
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