Abstract
ABSTRACT In this paper, we proposed studying a small urban drainage catchment, named Pilot Basin of Mirassol (PBM) in Natal, RN - Brazil whose outlet is a detention and infiltration reservoir (DIR). The rainfall-runoff transformation processes, water accumulation in DIR and the process of infiltration and percolation in the soil profile until the free aquifer were modeled; and, from rainfall event observations, water levels in DIR, free aquifer water level measurements, and also, parameter values determination, it was able to calibrate and modeling these combined processes. The mathematical modeling was carried out from the use of a distributed rainfall-runoff model, and besides, we developed a model to simulate the soil percolation in an unsaturated porous media. Continuous simulation was run over a period of eighteen months in time intervals of one minute. The generated hydrographs were transformed into inlet volumes to the DIR and then, it was carried out water balance in these time intervals, considering infiltration and percolation of water in the soil profile. As a result, we obtain an evaluation on the storage water process in DIR as well as the infiltration of water, redistribution into the soil and the groundwater aquifer recharge, in continuous temporal simulation. We found that the DIR has good performance in order to storage storm water (floods) and contributing to the local aquifer recharge process.
Highlights
And intense occupation of urban areas without integrated planning of various infrastructures for sustainable development has increased drainage problems during heavy rain events
The evaluation of the models presented here, as well as verification of the detention and infiltration reservoir (DIR) performance and estimates of groundwater recharge were done by analysis of the overall simulation over a period of 18 months (April/2014 to September/2015), with observations of rainfall and water levels in the lagoon and in the surface of the phreatic groundwater
It is set an initial condition for percolation model in unsaturated soil; so that it was assumed that the initial soil subsurface just below the reservoir is in the field capacity and, with a small reservoir bottom flow to the water table
Summary
And intense occupation of urban areas without integrated planning of various infrastructures for sustainable development has increased drainage problems during heavy rain events. This fact is notorious especially in areas of periphery or suburban, mainly for lack of efficient planning usually observed in Brazilian urban catchments. New conceptions for urban drainage regarding the use of hygienists systems and urban compensatory techniques to counter balance waterproofing by green areas and the use of lower topographic areas as local accumulation of drainage water are recently being discussed and applied. The spread of the concept and application of low-impact techniques in providing urban drainage come gradually changing urban drainage systems, when there is integration between urban infrastructure and city landscape adaptations
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