Full Equations Utilities (FEQUTL) Model for the Approximation of Hydraulic Characteristics of Open Channels and Control Structures During Unsteady Flow

U.S. GEOLOGICAL SURVEY WATER-RESOURCES INVESTIGATIONS REPORT 97-4037

1.3 Procedure for Computation of Function Table for Use in Simulation of Unsteady Flow with the Full EQuations Model

The procedure for computation of function tables with FEQUTL for use in simulating unsteady flow in a system of open channels and control structures with FEQ is as follows.

1. The basic descriptive data for the stream system is measured or determined from available sources.



2. The data describing the cross sections for the stream are placed in one of the formats supported in FEQUTL. Each cross section is given a unique number as identification. This number becomes the identification number of the resulting look-up table.



3. The cross-section table is computed in FEQUTL from the description of the stream cross section. The cross-section tables are placed in one or more data files. These files are accessed later in FEQ flow simulation.



4. Steps 1-3 are followed to compute tables for culverts, bridges, and other structures. The resulting look-up tables are stored in files for later access.



5. Once all the tables are computed and the description and control input for FEQ are prepared, FEQ is run with references to the appropriate data files to access the look-up tables.