COMPARISON BETWEEN THE TIME OF CONCENTRATION ESTIMATED BY THE NRCS VELOCITY METHOD AND THE EMPIRICAL EQUATIONS IN TWO URBAN WATERSHED AT MARECHAL CÂNDIDO RONDON, PARANA STATE, BRAZIL
DOI:
https://doi.org/10.61636/bpg.v1i113.3432Keywords:
Urbanização, Drenagem urbana, Oeste do ParanáAbstract
The objective of the work is to estimate the concentration time (Tc) of two small urban watersheds using the NRCS kinematic method and compare it with Tc values calculated by the empirical equations most commonly used in the literature. The urban watersheds are located at Marechal Cândido Rondon, Western region of Paraná state, Brazil and are part of the headwaters of the Guará and Borboleta streams, called in this paper the Unioeste and Peixe Frito points respectively. The Tc obtained by the NRCS kinematic method, and the empirical equations were compared using the percentage error, aiming to identify the empirical methods that provided the closest results with the kinematic method, taken as a reference. The results obtained show that most empirical equations tended to underestimate or overestimate Tc by various magnitudes in comparison with the values estimated by the NRCS kinematic method. This trend was observed in empirical equations applied to both rural and urban basins. No empirical method stood out in either watershed. The two watersheds presented a high degree of urbanization (>90%), however their morphometric characteristics are different, the Unioeste point has a lower slope and an oval shape, while the Peixe Frito point has a higher slope and a very elongated shape. These conditions of urbanization and morphometry gave rise to the prominence of the Corps Engineers, Desbordes and McCuen equations (of rural, urban and urban applications respectively) at the Unioeste point and the Carter, Picking and Kirpich formulas (urban, rural and rural formulas respectively) at the Peixe Frito point.
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