SANTOS, V. L. L.; http://lattes.cnpq.br/8896601254443923; SANTOS, Vinícius Lamark Lacerda.
Abstract:
The disorderly urban growth of cities has been causing serious problems for the maintenance
and management of water resources, being a determining factor for social and economic
development. As the urban fabric advances and occupies spaces, there is an increase in soil
impermeability and the risks of floods and inundations, resulting in significant losses for
society. Thus, this study aimed to perform a hydrological analysis of the Riacho do Frango
watershed in the city of Patos, PB, conducting a critical investigation into the hydraulic behavior
and drainage capacity of the region, considering project precipitations with different return
periods. The methodological process involved the survey of geomorphological characteristics
and land use in the watershed, using geoprocessing tools. Additionally, hydrological parameters
were determined based on the annual series of maximum daily rainfall obtained from the
database of the National Water and Basic Sanitation Agency (ANA). From the watershed
characterization, the curve number (CN) was determined to be 86, and the time of concentration
for the study area was found to be 54 minutes. For the temporal distribution of rainfall, the Yen
and Chow method was used, considering the occurrence of critical (or peak) precipitation for
periods close to half the duration of the rainfall. Finally, a return period of 30 years and a
duration of 90 minutes were chosen for estimating the design flow using the Soil Conservation
Service (SCS) method, with the Microsoft Excel and HEC-HMS hydrological modeling
software. The generated design hydrographs showed peak flows of 111,5 m3/s (Microsoft
Excel) and 120,0 m3/s (HEC-HMS). Regarding the calculated maximum flood depths for the
Frango Channel, considering standard sizing rules for rectangular channels, values were
obtained as 3,8 m (Microsoft Excel) and 4,0 m (HEC-HMS).