RUNOFF SIMULATION IN A PRE AND POST URBANIZATION AREA
DOI:
https://doi.org/10.5902/2179460X17276Keywords:
Drenagem urbana. Escoamento superficial. Impactos da urbanização.Abstract
http://dx.doi.org/10.5902/2179460X17276
This work intends, through simulations, to rate the urbanization impacts on the runoff at Gleba Palhano zone (Londrina/PR), where the conditions of the land, use and occupation, have changed dramatically in just two decades. Hydrological models were used to obtain the rainfall intensity curves and hydrographs. The rainfall intensity curves were generated from the values of heavy rains and the hydrographs were generated from rainfall intensity curves and by rating the soil conditions, before de urbanization (1991) and after (2013), through SCS model. The input variables were the conditions of the soil, use and occupation, soil humidity and characteristics, turnaround time and duration of the rainfall. Was notice an increase in the runoff volume in the study area after the urbanization, which is highly affected by the soil use and occupation. The simulation results for both sceneries demonstrate an increase of the runoff that was, respectively, for the rainfall duration of 15 minutes, 30 minutes, 1 hour and 3 hours: 139%, 68%, 44% e 35%, for Tr = 2 years, 115%, 61%, 41% e 32%, for Tr = 5years, 102%, 57%, 39% e 30%, for Tr = 10 years.
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