Potencial de captação e armazenamento de água de chuva para residências do estado da Paraíba utilizando modelagem por interpolação B-Spline Multinível.

Abstract

Rainwater harvesting systems are increasingly used in urban areas where these systems act as an alternative and minimize problems related to water unavailability. This work aimed to estimate and map the potential for capturing and storing rainwater and the consumption demand of municipalities in the State of Paraíba. This work aimed to estimate and map the potential for capturing and storing rainwater and the consumption demand of municipalities in the State of Paraíba. Average annual rainfall data from 2010 to 2022 was used and B-Spline Multilevel interpolation was carried out using SAGA® and QGIS®, generating maps of the capture and storage potential of 75; 150; 300 and 450 m2 of residential roof for a consumption of 160.6 m3.year. It was observed from this work that geoprocessing proved to be an efficient and fast tool together with the use of interpolation that presented satisfactory results in the use of multilevel bspline interpolation modeling. The greatest occurrence of rain, on average, is located in the municipalities of the Coastal strip entering the Agreste region up to the Brejo region, which has the best potential for capturing and storing rainwater. There is the potential for water capture throughout the State of Paraíba, however, in the Cariri/Curimataú and Sertão regions, capture may only be available for the minimum recommended use of water, and, therefore, not available for storage for later use. Roofs above 300 m2 of surface can guarantee the necessary capture for water consumption throughout the State. It is recommended to use cisterns to store excess rainwater collected.