The direct material losses of the residents of the cities of Belém do Pará, Brazil and Carrillo de Guanacaste, Costa Rica in the period 2000-2016 it´s evaluated due to extreme rainfall. Using the method of abduction and using dates of INMET, INM, IBGE, INEC, the natural, social and economic condition of the residents of the affected areas was identified, which served as the basis for the calculation. Constructed the water footprint index (Ipa) and the Environmental Average Material Monetary Assessment (AMA) the equation estimate loss after knowing the precipitation data of the event day. The monetary evaluation of the extreme event happened in the city of Belém on January 4, 2017, the INMET reported rainfall was 94.6 mm, and estimated water footprint reached 0.90 meters high, the loss estimated for the city was 122,106,834 Reference Monetary Units (UMR). In the city of Carrillo was evaluated the event of October 5, 2017, the rainfall reported by INM was 148.6 mm, the water footprint was 2.1 meters high, the estimated loss for neighborhood residents Bamboo is 3,094,579 UMR. Then, the index as the applied equation show effective for the calculation of the direct material monetary damages in the area reached after an extreme precipitation event. Limiting the calculation of the loss suffered by the population in vulnerable condition and without evaluating other related factors such as permanence, force and speed of water; the value of intangibles (interruption of services, illnesses) in both the affected area and the impact areas. In spite of this, the result is used to make preventive, corrective, and operative actions in a city.
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