Análise econômica de redes de drenagem urbana com base no dimensionamento hidráulico de tubulações de concreto e PEAD

Abstract

In view of the increasingly frequent occurrence of intense hydrological events, proper planning of sanitation infrastructure becomes essential, especially of urban stormwater drainage systems, which are crucial for flood mitigation and public safety. In this context, this study presents a technical–economic analysis comparing concrete pipes and high-density polyethylene (HDPE) pipes applied in urban drainage networks. The adopted methodology consisted of the design and cost estimation of a drainage network designed for a fictitious subdivision, developed based on technical parameters consistent with the guidelines of the municipality of Teresina. The analysis considered both implementation costs and the evaluation of the economic performance of the alternatives over time. The results indicated that the network executed with concrete pipes presents a slightly lower initial cost compared to the HDPE alternative, while the latter proved to be more advantageous in several construction stages due to the material’s installation and constructive characteristics. The long-term analysis showed that economic feasibility depends on the adopted time horizon, since over longer periods HDPE tends to present better economic performance. It is concluded that the choice of material should consider not only the initial cost but also the economic behavior throughout the drainage network’s life cycle.