Infiltration well as compensatory measure of urban drainage: A financial analysis

Abstract

The growth of cities generates a waterproofing of soils, causing much of the rain to seep off superficially. To remove this flow as soon as possible from the urban perimeter, urban drainage works are carried out. As in Brazil, conventional drainage techniques still predominate, in which the flow is transferred to the downstream points of the basin, these over time become inefficient, thus generating the need for the adoption of compensatory measures, among which we can mention the infiltration well. In view of the above this article aims to size an infiltration well for different areas of capture and perform a financial analysis of the construction of these devices. Four catchment areas (100 m², 250 m², 500 m² and 1000 m²) were adopted in the city of Aracaju/SE and for the sizing of the well was used a method adapted from Carvalho Júnior (2020). Wells with total depth ranging from 1.15 m to 6.10 m were obtained, and construction costs ranged from R$ 2,465.95 to R$ 8,697.53. Based on the results obtained, it is concluded that the sizing method applied is easy to apply, but implies larger wells, and finally, the replacement of concrete rings by another type of coating, can reduce the total cost for execution.