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Q: Identify the method that is NOT used for the computation of average rainfall in a catchment having n number of stations.
  • A. Hyetograph method
  • B. Thiessen polygon method
  • C. Arithmetic average method
  • D. Isohyetal method
Correct Answer: Option A - Hyetograph is a graph plotted between intensity of rainfall against time. Method of determining the average rainfall in a catchment– (a) Arithmetic average method (least accurate) (b) Thiessen polygon method (c) Isohyetal method (most accurate)
A. Hyetograph is a graph plotted between intensity of rainfall against time. Method of determining the average rainfall in a catchment– (a) Arithmetic average method (least accurate) (b) Thiessen polygon method (c) Isohyetal method (most accurate)

Explanations:

Hyetograph is a graph plotted between intensity of rainfall against time. Method of determining the average rainfall in a catchment– (a) Arithmetic average method (least accurate) (b) Thiessen polygon method (c) Isohyetal method (most accurate)