The study of the use of rainwater: I annul faculty of ecology of St. Martín Tarapoto's National University UN-SAMARIUM T, it has the purpose to detennine the hydric offer generated by precipitation (rainwater) and consistent mind to analyze the possibilities of use ru1d sustainable use ofthe water resource. San Martin P.eru's, Ubicado's Sub-Region of the High May, Departamento in the Nor Orient ofthe Pemvian Amazonia, is a zone ofhigh precipitation (1720,9 mm), but of insufficient availability of water for population use, besides precipitation, in the survey area, has characteristics very told apart as to intensity, duration and frequency. Besides the increment of the student population is every year more than the previous one and he finds itself distributed between the different academic cycles of both academic schoo.ls and besides, the adminjstrative st:a,ff, teachers and among others...