WMS:OC Rational Reach Routing

Reach routing data is assigned to the upstream node of each reach. Select a node and use the Edit Parameters command in the OC Rational menu to define data. You can select another node at any time while the Orange County Rational Method – Edit Parameters dialog is displayed and view its reach data.

Entering Parameters

Toggle on the checkboxes next to each routing type and select the conveyance type to use any combination of surface (streets and trapezoidal channels) and sub-surface (pipes and culverts) routing. Enter parameters for the highlighted routing type in the spreadsheet below. Values for reach length, up elevation, down elevation, and slope will be computed for you if you are using GIS data.

Routing Computations

Flow will be routed through subsurface conveyance types first and then any excess flow will be routed using the surface conveyance type, if defined. Overflow messages will be displayed in the output report.

Design/Analysis Mode

There is a design and analysis mode if you are using sub-surface circular pipes. Enter the actual pipe diameter for the analysis mode or enter 0.0 for the pipe diameter to use the design mode. The design mode will calculate the smallest standard pipe to carry the computed flow. View the design pipe size here after running a simulation.

Related Topics

• Sub-area Data
• Reports
• Running a Simulation
• Creating Watershed Models