Research Information System
4th IWA International Symposium on Water and Wastewater Technologies in Ancient Civilizations, Coimbra, Portugal, 17 - 19 September 2016, pp.1-4
Increase in urbanization in a watershed affect both surface water and groundwater resources. Developing impervious area increases the excess runoff and volume of water collected at the downstream of the watershed. These characteristics of development change hydrologic cycle and also cause flood especially at the downstream of the basin. Low Impact Development (LID) Best Management Practices (BMPs) have been developed in order to diminish adverse effects of increasing excess storm water runoff. Bioretention type of LID is used to prevent flood by decreasing runoff volume and peak flow rate and to manage storm water by improving water quality. In this study, an empirical formula is derived to predict the peak outflow from a bioretention column depending on the ponding depth on bioretention, surface area, hydraulic conductivity, porosity, suction head, initial moisture content and height of the soil mixture used in bioretention column using teaching-learning based optimization (TLBO) method. For analyses, the results of experiments conducted using Rainfall-Watershed-Bioretention (RWB) system are used. The reliability of the empirical formula is evaluated by calculating the absolute percent error between the peak value of the measured flow and calculated flow. The results show that the performance of the empirical formula is satisfactory.