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

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