## Steady Flow Modelling: Water Surface profiles for Natural Rivers with a junction

- Confluence: Connecting point of multiple river
- Bifurcation: Point where a single river divides into multiple streams

### Introduction

- Two additional boundary conditions (total three)
- From continuity equation: Q1 + Q2 = Q
- From energy equation: we assume water surface is at same level at confluence (of three rivers)

### Objectives

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### Procedure

- Change unit to US Customary

#### Geometry

- Manning's n = 0.025
- Copy cross-sectional data from corresponding Excel sheet
- Copy reach lengths (LOB, Channel, ROB) from corresponding Excel sheet
- Enter junction length from corresponding Excel sheet
- If at confluence, stations are displaying with overlap, reopen HEC-RAS after saving

#### Flow Data

- Use Excel's corresponding sheet
- Enter boundary condition of d/s (normal depth) for Padma

#### Steady Flow Analysis

- Use flow regime subcritical