Caracterização Fisiográfica E Do Uso E Ocupação De Bacias Urbanas Em Juazeiro Do Norte/Ce

Abstract

The characterization of watersheds is essential for the implementation of solutions that minimize urban drainage problems. This work presents the characterization of the watersheds of Riacho dos Macacos and Timbaúbas, which are the main basins in the city of Juazeiro do Norte, Ceará. Physical, hydraulic, and hydrological characterizations and land use and occupation studies were performed by geoprocessing techniques using Sentinel-2 satellite images, Shuttle Radar Topography Mission data, and QGIS processing. Thirteen sub-basins were delimited with a total area of 57.3 km², flat to smooth-wavy relief, and concentration time ranging from 19 to 121 min. The two less urbanized sub-basins, SB1 and SB2, presented 71% and 61% of vegetation, respectively. On the other hand, intense urbanization generated 72.5% of impermeable areas in one of the sub-basins (SB10). In agreement with the waterproofing rates of the basins and soil type, the Curve Number, of the method Natural Resources Conservation Service (NRCS), ranged from 70 (SB1) to 90 (SB10) and averaged 79. Indicators of susceptibility to floods agree with the frequent occurrences of floods in the SB3, SB6, and SB11 sub-basins that mainly include the neighborhoods of Lagoa Seca and Jardim Gonzaga.

Proposals for water conservation in urban areas in Brazil

“…The cost of implementing the reuse system corresponded to 0.34% of the amount invested in the construction of the hotel. With the savings generated in water consumption, the investment in the reuse system had an estimated amortization period of 50 months (Gonçalves et al, 2010).…”