Temporal analysis of static level of tubular wells for public supply in Campo Grande

Abstract

The groundwater demand for public water supply is rising in big cities. In Campo Grande (MS), 46% of the water supply is extracted by tubular wells from the Bauru, Guarani and Serra Geral aquifer systems. Static level depth graphs and potentiometric map were created based in deep wells measures at two different moments, at drilling and in 2016, allowing a data temporal analysis. The Bauru Aquifer System (SAB) has a 2.4 m drawdown in the city, after 5 years supplying water. The Guarani Aquifer System (SAG) has a 34 m drawdown, after 22 years of water discharge for public supply. Thus, it indicates a falling static level at regional scale. The Serra Geral Aquifer System (SASG) has the lowest drawndown, after 30 years extracting water. The classification of Brazilian aquifers of the Brazilian Geological Survey based on the specific capacity, attributes a high hydrogeological potential to the aquifer systems in Mato Grosso do Sul. For SAB it is classified as a high productivity aquifer system; the SAG as a very high productivity aquifer system and the SASG as an aquifer system of moderate productivity. Therefore, the periodical temporal evaluation of aquifer systems is necessary as a tool for public water supply in big cities and to understand the aquifers behaviour along the time.