V Determination of average annual rainfall in the Aguablanca stream watershed using GIS and IDW method

Abstract

In this investigation is analized the average annual rainfall of the hydrographic basin of the Aguablanca stream through the data provided by the Institute of Hydrology, Meteorology and Environmental Studies (IDEAM) ranging from 1976 to 2016, because there aren´t pluviometric stations relatively close, the methodology is used IDW with the intention of interporlation results and have a calculation close to reality. it´s concluyed lhe average annual precipitation of this river is 1327.9 mm/year, a normal value for a river basin in a tropical zone, also calculating the amount of water volume, is possible to calculate the amount of evapotranspired water, parameters that vary according to temperature and type of vegetation.

Keywords

• Mean precipitation
• watershed
• stream
• IDW