# GMS:HydroGeoSphere Arc Properties

HydroGeoSphere | |
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Models & Tools | |

HGS Simulation Control HGS Materials HGS Coverages HGS Arc Properties HGS Point Properties HGS Polygon Properties HGS Renumber UGrid | |

The *Arc Properties* dialog is where the parameters for an arc in a boundary conditions coverage or hydrograph coverage are defined in a HydroGeoSphere model. Only one type of boundary condition can be assigned to a feature object on a boundary conditions coverage. For hydrograph coverages, "Hydrograph" is the only option available to assign to a feature object.

Arcs must be located coincident with UGrid points and vertical faces in XY. Arcs are mapped to different UGrid components based on the boundary conditions type:

- Head – node
- Flux – face
- Simple river – node
- Simple drain – node
- Critical depth – segment

## Contents

## Head or Flux

Head and flux are two separate available arc property types on a boundary conditions coverage, but the input options available are the same. Head is a general specified head boundary condition, and flux is a general specified flux boundary condition. The input options for head and flux are listed below.

*Name*– Enter a name for the arc.*Domain*– The domain in which the boundary condition is applied.- "Porous media" – Set properties for porous media.
*Vertical range*– Vertical range for porous media.- "Max/min node sheets" – Boundary conditions will be applied between the minimum and maximum node sheets.
*Maximum sheet*– Value for the maximum node sheets.*Minimum sheet*– Value for the minimum node sheets.

- "Top/bottom elevations" – Boundary conditions will be applied between the top and bottom elevations.
*Top elevation*– Value for the top elevation.*Bottom elevation*– Value for the bottom elevation.

- "Max/min node sheets" – Boundary conditions will be applied between the minimum and maximum node sheets.
*Input type*– How the boundary condition data is specified.- "Constant"
*Constant (start)*– Constant value of the boundary condition at the start of the arc.*Constant (end)*– Constant value of the boundary condition at the end of the arc.

- "Time series"
*Time series (start)*– Time-varying values of the boundary condition at the start of the arc.*Time series (end)*– Time-varying values of the boundary condition at the end of the arc.*Interpolate*– Causes time-varying values to be interpolated, resulting in a smoother application of the time-varying function.*Map to grid boundary*– Map boundary condition to the boundary of the grid (not the interior).

- Note – If different values are specified for the start and end, then the values are interpolated to the points in the middle of the arc using linear interpolation.

- "Constant"

- "Surface flow" – Set properties for surface flow.
*Input type*– How the boundary condition data is specified.- "Constant"
*Constant (start)*– Constant value of the boundary condition at the start of the arc.*Constant (end)*– Constant value of the boundary condition at the end of the arc.*Map to grid boundary*– Map boundary condition to the boundary of the grid (not the interior).

- "Time series"
*Time series (start)*– Time-varying values of the boundary condition at the start of the arc.*Time series (end)*– Time-varying values of the boundary condition at the end of the arc.*Interpolate*– Causes time-varying values to be interpolated, resulting in a smoother application of the time-varying function.*Map to grid boundary*– Map boundary condition to the boundary of the grid (not the interior).

- Note – If different values are specified for the start and end, then the values are interpolated to the points in the middle of the arc using linear interpolation.

- "Constant"

- "Porous media" – Set properties for porous media.

## Simple River or Simple Drain

Simple river and simple drain are two separate available arc property types on a boundary conditions coverage, but the input options available are the same. Simple river is a river flux drainage boundary condition, and simple drain is a drain flux drainage boundary condition. The input options for simple river and simple drain are listed below.

*Name*– Enter a name for the arc.*Input type*– How the boundary condition data is specified.- "Constant"
*Constant (start)*– Constant value of the boundary condition at the start of the arc.*Constant (end)*– Constant value of the boundary condition at the end of the arc.*Map to grid boundary*– Map boundary condition to the boundary of the grid (not the interior).

- "Time series"
*Time series (start)*– Time-varying values of the boundary condition at the start of the arc.*Time series (end)*– Time-varying values of the boundary condition at the end of the arc.*Interpolate*– Causes time-varying values to be interpolated, resulting in a smoother application of the time-varying function.*Map to grid boundary*– Map boundary condition to the boundary of the grid (not the interior).

- "Constant"

## Critical Depth

The critical depth boundary condition determines the rate at which mass is leaving the model domain.

*Name*– A descriptive name for the boundary condition, which can be up to 80 characters.*Map to grid boundary*– Map boundary condition to the boundary of the grid (not the interior).

## Hydrograph

Assigning "hydrograph" to an arc causes HydroGeoSphere to record hydrograph data during the model run. The coverage then needs to be added to the simulation. Upon the completing the simulation run, HGS will output detailed flow rate information at each time step for each arc that has been assigned a hydrograph.

*Name*– A descriptive name for the hydrograph, which can be up to 80 characters.*Map to grid boundary*– Map grid to the boundary of the grid, not the interior.

## Related Topics

GMS – Groundwater Modeling System | ||
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Modules: | 2D Grid • 2D Mesh • 2D Scatter Point • 3D Grid • 3D Mesh • 3D Scatter Point • Boreholes • GIS • Map • Solid • TINs • UGrids | |

Models: | FEFLOW • FEMWATER • HydroGeoSphere • MODAEM • MODFLOW • MODPATH • mod-PATH3DU • MT3DMS • MT3D-USGS • PEST • PHT3D • RT3D • SEAM3D • SEAWAT • SEEP2D • T-PROGS • ZONEBUDGET | |

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