[Next Section] [Previous Section] [FEQUTL Update Contents]

*Enhancements and Modifications to the Full Equations Utilities (FEQUTL)
Model, March 1995 to August 1999.
Note: This document is separate from the U.S. Geological Survey report by Franz and Melching (1997). This description of enhancements and modifications to the Full Equations Utilities Model has not been approved by the Director of the U.S. Geological Survey. *

*Input description update for section
5.8, FEQX Command, Franz and Melching (1997b), p. 116*

**Section 5.8 FEQX Command**

Variables: | NAVM, SCALE, SHIFT, VSCALE, HSHIFT |

Format: | 5X, I5, 7X, F10.0, 7X, F10.0, 8X, F10.0, 8X, F10.0 |

Example: | NAVM=00001 SCALE= 1.0 SHIFT= 0.2 |

Explanation: |

Selects the methodology for computing the effective roughness of a compound cross section and also provides optional values for scaling of the offsets and shifting of the elevations. If NAVM= 0, FEQUTL computes the total conveyance from the sum of the subsection conveyances. This is the method of choice for most open channels. If NAVM = 1, FEQUTL computes a weighted Manning's n value using the wetted perimeter in each subsection as the weight. Then the conveyance for the cross section is computed using the weighted-average n value. This is the method of choice for closed conduits having abrupt variation of roughness around their perimeter. |

The value of SCALE multiplies the offsets and can be used to adjust for scaled measurements from a map. The value of SHIFT is added to the elevation of each point on the boundary of the cross section. If omitted, SCALE = 1.0 and SHIFT = 0.0. The value of VSCALE is used to change the vertical scale for the elevations. This is useful when working in a stream system in which two different unit systems are in common use. HSHIFT is used to shift the offsets if needed. If omitted, VSCALE = 1.0 and HSHIFT = 0.0. |