WMS:TR-20 Routing Data

Outlet points are used to define locations where hydrographs are combined and then routed downstream. The appropriate combined hydrograph (ADDHYD records) stations are generated automatically when writing a TR20 file. However, routing data must be entered in order to simulate the movement of a flood wave through the river reaches or reservoirs. The effects of storage and flow resistance are accounted for in the shape and timing of the flood wave.

Routing data is entered by selecting an outlet and then selecting the Routing Data button from the Edit TR20 Parameters dialog.

Routing Method

TR20 has two different routing methods to choose from. If cross-sectional data is available it can be used to establish routing parameters using a “m-value” method. If the cross-section data are not available a Kinematic wave method may be used instead. The method for each outlet is determined by the radio group selection.

Outlet Names

Since outlets are used for both types (adding and routing) of hydrograph stations in the TR20 input file, a separate name for each type of hydrograph must be entered. The name should be eight characters or less and is used to read hydrographs from the results file.

Related Topics

• TR20 Overview
• Editing TR20 Parameters
• Reach Length
• Defined Cross Section
• Kinematic Wave
• Direct Input Hydrographs