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    Runoff and pollutant load modelling using a catchment modelling toolbox: city drain. Case of study: sustainable urban drainage system located at San Cristobal Sur Metropolitan Park in Bogotá, Colombia / Havza modelleme aracı kullanarak akış ve kirletici yük modellemesi: City Drain. Vaka analizi: Kolombiya, Bogota'daki San Cristobel Sur Metropolitan Parkı'nda bulunan sürdürebilir kentsel drenaj sistemi
    (Maltepe Üniversitesi, 2019) Torres, Juan David Chamat
    The global urban growth phenomenon had cause an impending loss of vegetation cover and an increasing of the waterproof surface area in urban areas. These changes in usage and ground features have directly affected the hydrological processes of the catchments in factors such as the frequency, magnitude and speed of runoff. Besides that, drastic variations have been identified in the infiltrated water volumes, in the base flows and in the concentration times of the basin, after a rainfall event. As a consequence from these hydrological variations problems such as increased risk of flooding and deterioration of water quality of receiving water bodies have been exacerbate. The above reasons justify the importance of studying what is the precision level with which the volume of runoff and the pollutant load associated to a rainfall event can be represented. A programming toolbox was used and adapted; City Drain, which allow to simulate the accumulation of pollutants during dry weather period, their wash-off and runoff during rainfall events with different conceptual principles. The investigation was carried out in the tributary catchment of the Sustainable Urban Drainage System located at San Cristobal Sur Metropolitan Park in Bogota, Colombia. Three precipitation events were characterized during the first semester of 2018. To quantify the precision level of the models, an objective function was established to calibrate the parameters of each model. The volume of runoff was calibrated by means of the Nash-Sutcliffe Coefficient and the contaminant load with an absolute percentage error. Taking into account the initial results, the models can have the capacity to represent with an acceptable accuracy the behavior of the catchment. Computational modelling of flow and pollutant dynamics in urban areas is playing an important role to planning and design of strategies for the management of runoff in urban areas.