The Thiessen polygon method in hydrology is used to compute:
Choose the correct answer
Stream discharge by velocity-area method
Mean areal rainfall over a catchment, weighting each gauge by its Thiessen polygon area
Runoff coefficient
Groundwater table level
Correct Answer
B. Mean areal rainfall over a catchment, weighting each gauge by its Thiessen polygon area
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Thiessen polygon: a method to find mean areal rainfall over a catchment when rain gauges are non-uniformly distributed. Perpendicular bisectors between adjacent gauges form Thiessen polygons; each gauge gets a weight = area of its polygon/total catchment area. Mean rainfall = Σ(Pi × Ai)/ΣAi. More accurate than arithmetic mean for non-uniform distribution.
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