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Assessment of stormwater runoff of Padma Bridge Link Road at Southwest Part of Dhaka Using Geo-SWMM

Sheonty, S.R., Mabruk, J. and Khan, S.M. (2021) Assessment of stormwater runoff of Padma Bridge Link Road at Southwest Part of Dhaka Using Geo-SWMM. Lecture Notes in Civil Engineering, 178 . pp. 63-76.

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Urban flooding is a common problem in many cities of Bangladesh. A rapid growth of urbanization is observed around southwest part of the Dhaka City (Tegharia and Baghair, Keraniganj) beside the Buriganga and Dhaleshwari River. But unfortunately, there is lack of adequate drainage network system here which creates drainage congestion. The Padma Bridge link road passes through this area which is an important part of the dream project of Bangladesh—the ‘Padma Bridge Multi-purpose project’. The link road is significant because of its economic importance for improving connectivity of the southern districts of Bangladesh with capital Dhaka. So, assessment of stormwater runoff and design of proper drainage network is essential to ensure the longevity of this road. In this study, two separate models for Tegharia and Baghair were developed using Geo-SWMM. Watersheds were delineated in both the models using DEM of the study area. The annual maximum daily rainfall was estimated using EV1 or Gumbel Distribution method. The peak runoff of each catchment was determined for 5 year and 10 year return period using the Geo-SWMM model. Runoff coefficients had also been obtained from the Geo-SWMM model output for different sub-catchment areas, and the value was observed from 0.6 to 0.7 for Baghair and 0.39 to 0.63 for Tegharia. Design of the drainage conduit for both Baghair and Tegharia was the prime objective of the study. The minimum cross-sectional areas of the drainage conduits for both of the regions were estimated using the runoff values got from the model simulations.

Item Type: Journal Article
Publisher: Springer, Singapore
Copyright: © 2022 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Other Information: Virtual Conference on Disaster Risk Reduction, VCDRR 2021Virtual, online15 March 2021 through 20 March 2021
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