ABSTRACT:

Biannual hydrogeologic cycle characterization in a natural semi arid environment, we have applied and compared Craig-Gordon isotopic model with the Penman physical evaporation model. Results presented include rain water, atmospheric water vapor, agricultural pool water, isotopic evaporation loss and Penman evaporation estimation Physical and isotopic methodologies are difficult to relate due to basic fundamentals and development conceptualizations. Further work is required to enhance the Craig-Gordon and Gonfiantini evaporation model and its relationship with physical methodologies to obtain accurate estimations in evaporation in natural semiarid environments.