This program calculates the spillway discharge at different water elevations. As the water elevation initially rises above the riser, the flow is controlled by weir flow. The program uses the perimeter of the riser for the weir length for the weir flow calculation. The riser can be either circular or box. At higher water elevations the flow is under orifice control. When the barrel flows full, the flow is controlled by full pipe flow. Given the water elevation and spillway dimensions, the program calculates the type of flow and discharge.
The Calculate button will read the
values in the dialog, calculate the flow and report this flow value
at the bottom of the dialog. The Report button will generate a
report of the input values and calculated flows. The File routine
will create a stage-discharge (.STG) file. The Draw function will
draw and label the drop pipe spillway in the drawing at the
specified scale. The Graph button creates a stage-discharge graph.
Riser Parameters: Indicate the various parameters for the vertical riser pipe.
Culvert Parameters: Indicate the various parameters associated with the culvert.
Headwater Elev: Indicate the water (pool) elevation.
Calc: Causes the routine to read the values in the dialog and calculate the Discharge flow which is subsequently reported.
Stage-Discharge Result: Displays the following dialog box that allows you to indicate the water elevation range and increment to report:
Write Stage-Discharge File: Creates a Stage-Discharge (.STG) file that can be used in other Carlson Hydrology commands.
Draw: Allows a graphic representation of the Stage-Discharge data to be placed into the drawing.
Draw Grid: When enabled, this option creates a grid that accompanies the Stage-Discharge curve. Click the Setup button to access the grid settings which are discussed in detail in the Draw Grid section of the Draw Profile command.
Output to Separate Drawing: When enabled, this option draws the hydrograph to a separate drawing. Click the Set button to specify the name/location of the external drawing.
Horizontal Scale: Specify the discharge scale (in CFS).
Vertical Scale: Specify the stage scale (in Ft).
The Layers, Colors, Text Styles/Sizes and Linetypes buttons provide access to settings for each of these features of the Stage-Discharge curve.
Load Settings: Loads a saved collection of Draw Stage-Discharge settings, saved in a (.PFS) file.
Save Settings: Saves all Draw Stage-Discharge settings in a (.PFS) file.
Pulldown Menu Location(s):
Structure
Keyboard Command: spillway
Prerequisite: None