Modeling Branching Irrigation Canal Networks

by Francis N. Gichuki, Utah State Univ, Logan, UT, USA,
Wynn R. Walker, Utah State Univ, Logan, UT, USA,
Gary P. Merkley, Utah State Univ, Logan, UT, USA,



Document Type: Proceeding Paper

Part of: Irrigation Systems for the 21st Century

Abstract: A mathematical model of branching canal network has been developed based on solving the integrated form of Saint Venant equations which describing steady and unsteady, uniform and non-uniform flow. The model simulates canal filling, operating, and draining phases, bulk lateral outflow or inflow into the section being modelled, and control structure scheduling (gate-stroking). The model has three water control options: (1) operator decision control in which the model user decides on what inflows and control structure settings should be implemented; (2) program generates system inflow and the control structure settings which achieve predetermined flow depths; and (3) program generates system inflow and the control structure settings which deliver a specified discharge to the lower reach. The program is menu driven, includes a built-in 'help' explanations that can be called at any point in the simulation process. It traps data entry errors and has a graphical display of input and simulation status. Interactive simulation is provided to enable the user to pause simulation and critically examine the simulation status.

Subject Headings: Canals | Structural control | Hydraulic models | Structural models | Inflow | Flow control | Water flow

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