Qualidade das águas subterrâneas na sede municipal de Frecheirinha/Ce e a caracterização das obras de captação

Abstract

This work was developed in the municipal seat of Frecheirinha, where the study area (51,88 km2) is inserted, located in the northwestern porfiou of the state Ceará, merely with Ubaj ara South, East and West with Tianguá Coreaú. Objective assessment of the situation and analysis of the works of uptake of groundwater in limestone Frecheirinha through its hydrodynamic characteristics, data construction, use and nature of the wells, as well as qualitative analysis of groundwater from chemical-physical parameters. The methodology consisted of literature, registration of wells, development of thematic bases, stages of fields, processing and integration of data and, finally, the preparation of the report. The area presents a domain hydrogeological crystalline limestone outcropping characterized by Frecheirinha. Obtained a record of 20 wells in the municipal seat, 19 public wells and one particular, all coated PVC, whose multiple purpose, and one built of masonry excavated by the rock material removed in excavation From 51 wells registered in the database SIRGAS with depth data, we obtained an average of 58.57 m depth, these were observed 42 (82.36%) wells deeper than 50m and 9 (17.64%) Wells had a depth between 20 and 50 meters. With respect to qualitative data highlight the Total Hardness whose waters of the municipal waters classified as very hard, because the values are higher than 200 mg / L CaCO3, noting that in addition to this, all values are within the standards potability recommended (2914/2011 MS of Brazil). Regarding the use of water for irrigation, there was a salinity of high risk and low risk sodium, since ion classification of groundwater was identified predominantly water bicabornatadas calcic (80%) and sulfated or chlorinated water calcic or magnesian (20%).