Description Usage Arguments Details Value Examples

Compute geometry relations for trapezoidal channels.

1 | ```
channel_geom(y, B, SS)
``` |

`y` |
Flow depth [ |

`B` |
Channel bottom width [ |

`SS` |
Channel sideslope [ |

Channel geometry relations are routinely calculated in numerical solutions of steady, gradually-varied and unsteady flows. This function is used extensively by internal procedures and is made accessible to the user for convenience.

Named vector:

`A` |
Flow area [ |

`P` |
Wetted perimeter [ |

`R` |
Hydraulic radius [ |

`dAdy` |
Water surface width [ |

`dPdy` |
First derivative of wetted perimeter w.r.t. flow depth. |

`dRdy` |
First derivative of hydraulic radius w.r.t. flow depth. |

`DH` |
Hydraulic depth [ |

`ybar` |
Vertical distance from water surface to centroid of flow area [ |

1 2 | ```
channel_geom(1.71, 100, 0) # rectangular channel
channel_geom(5.79, 6.1, 1.5) # trapezoidal channel with sideslope 3H:2V
``` |

```
A P R dAdy dTdy dPdy
171.0000000 103.4200000 1.6534519 100.0000000 0.0000000 2.0000000
dRdy DH ybar
0.9349555 1.7100000 0.8550000
A P R dAdy dTdy dPdy dRdy
85.6051500 26.9761419 3.1733652 23.4700000 3.0000000 3.6055513 0.4458854
DH ybar
3.6474286 2.3281400
```

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