Urban Drainage Design According to Turkish Rainwater Harvesting and Disposal Guideline
Keywords:Rainfall intensity, Stormwater, Runoff, Urban flood, Urban flood control
Urban areas become more prone to flood disasters due to the rapid urbanization with increasing rate of impermeable layers. Integrated green infrastructure is one of the most effective tools for stormwater management and runoff reduction in urban areas. Identification of flood-prone regions is crucial for flood mitigation. Improving permeable paving and sustainable drainage system can reduce floods in urban areas. In this study, Barış Street in Selçuklu district of Konya is selected for stormwater drainage design using rational method. The study area is very well developed in terms of constructed buildings, but there is lack of green infrastructure. Hence, this area might be prone to urban flood. Intensity-Duration-Frequency (IDF) curves were used for the intensity determination. Seven different periods of 2, 5, 10, 25, 50,100 and 200 years were selected for stormwater drainage design. Rainfall intensity determination was based on 15 minutes of duration. Rain yield was calculated for each period. The pipe diameter for drainage system was calculated for the selected periods according to partially full pipe flow rate of 60%. As a result; 400 mm diameter for 2 years, 500 mm diameter for 5, 10, 25 years and 600 mm diameter for 50, 100, 200 years return periods have been found. Considering the increasing impacts of climate change, 600 mm of pipe diameter for Barış Street in Selçuklu district of Konya would be appropriate for the urban drainage system.
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