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Q: The Thiessen polygon method is used to __________.
  • A. calculate wind correction for rainfall
  • B. divide catchments into sub-catchments
  • C. calculate average precipitation over an area
  • D. estimate the convective part of rainfall
Correct Answer: Option C - Thiessen polygon method: In order to achieve accurate estimation of the spatial distribution of rainfall it is necessary to use interpolation methods, for this the Thiessen method is considered as the most important in engineering practice . • This method assigns weight at each gauge station in proportion to catchment area that is closest to that gauge.
C. Thiessen polygon method: In order to achieve accurate estimation of the spatial distribution of rainfall it is necessary to use interpolation methods, for this the Thiessen method is considered as the most important in engineering practice . • This method assigns weight at each gauge station in proportion to catchment area that is closest to that gauge.

Explanations:

Thiessen polygon method: In order to achieve accurate estimation of the spatial distribution of rainfall it is necessary to use interpolation methods, for this the Thiessen method is considered as the most important in engineering practice . • This method assigns weight at each gauge station in proportion to catchment area that is closest to that gauge.