Department of Water Resources Engineering, Bangladesh University of Engineering and Technology, Bangladesh
*Corresponding Email: tasmiahahsan@ymail.com
Online published on 13 February, 2018.
The Dhaleshwari River is a distributary of Jamuna River and flows past Dhaka city into the Meghna estuary. The flow through the Dhaleshwari River is influenced by roughness characteristic of the channel material. Manning's n is used extensively around the world to predict the degree of roughness in channels. This paper presents a hydrodynamic HEC-RAS 1D model to estimate Manning's n for the Dhaleshwari River. The system requires data including cross-section, water level and discharge measurements. After a model is developed, it undergoes a calibration and a validation phase. Finally the calibrated and validated model result for Manning's n can be used for scenario analysis.
Roughness coefficient, boundary condition, flow hydrograph, stage hydrograph, calibration, validation, RSR, NSE
