1. Home
  2. Knowledge Base
  3. GeoHECRAS
  4. Hydraulic Parameters – Storage Area Connections Command

Hydraulic Parameters – Storage Area Connections Command

The Hydraulic Parameters – Storage Area Connections command is used to define the hydraulic parameters that are used for building a family of rating curves for storage area connections. This data is only used for unsteady flow simulations and is ignored for steady flow simulations.

Follow the steps below to use the Hydraulic Parameters – Storage Area Connections command:

  1. From the Analysis ribbon menu, expand the Rating Curves – Hydraulic Parameters dropdown combo box and select the Hydraulic Parameters – Storage Area Connections command.
    Hydraulic Parameters - Storage Area Connections analysis ribbon menu command
  2. The Hydraulic Parameters – Storage Area Connections dialog box will be displayed.
    Hydraulic Parameters - Storage Area Connections dialog box

The following sections describe the Hydraulic Parameters – Storage Area Connections command and how to interact with the above dialog box.

Selecting Storage Area Connection

This section is used to select the storage area connection for purposes of defining the hydraulic parameters.

The following parameter is available:

  • Storage area connection ID
    This dropdown combo box lists the storage area connections for only those connections that are of the following structure type for the current scenario:

    1. Weir
    2. Weir and Culverts
      The user can select the storage area connection from the dropdown menu or click the […] button to select it from the Map View.

Family of Rating Curve Parameters

This section is used to define the limits of the family of rating curves that are developed for the storage area connection. The following parameters are available:

  • Number of points on free flow curve
    This spin-control defines the number of points to be computed on the free flow curve. By default, the software uses a value of 50. However, the user can enter a different value ranging from 10 to 100.
  • Number of submerged curves
    This spin-control defines the number of submerged curves to be computed. By default, the software uses a value of 50. However, the user can enter a different value ranging from 10 to 100.
  • Number of points on each submerged curve
    This spin-control defines the number of points to be computed on each of the submerged curves. By default, the software uses a value of 20. However, the user can enter a different value ranging from 10 to 50.
  • Apply curve parameters to all storage area connections
    Clicking the [Apply] button causes the above parameter values to be applied to all storage area connections contained in the HEC-RAS current scenario.

Storage Area Connection Parameters

This section defines the parameters for computing the rating curves for the selected storage area connection. The following parameters are available:

  • Maximum headwater elevation
    This entry defines the maximum elevation that the water surface can reach on the upstream side of the storage area connection and is used to create the hydraulic property table. By default, this entry is blank.
  • Maximum tailwater elevation, optional
    This optional entry defines the maximum elevation that the water surface can reach on the downstream side of the storage area connection, a parameter used in creating the hydraulic property table. By default, this entry is blank.
  • Maximum flow, recommended
    This optional (but recommended) entry defines the maximum flow expected at the storage area connection, another parameter used in creating the hydraulic property table. By default, this entry is blank.

About the Author Chris Maeder

  • Was this Helpful?
  • YesNo

Was this article helpful?

Related Articles