The result of the arithmetic average method was not selected because regardless of the level of stations near and far to the study area
from the table found between the results Theissen polygon method and the party-line method difference not much. Authors selected results from Contours method because the method described close to reality as possible.
So the average annual rainfall in catchment studies in 2251 and 2273 mm for line 1 and 2 respectively.
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