Polygon Data Fields (InfoWorks)

A polygon is made up of a series of vertices and edges.

The polygon objects are:

• General Polygons - provide a method for specifying a geographical area on the GeoPlan Window. Polygons can be used:
  • as a bounding polygon when generating subcatchment boundaries using Thiessen polygons
  • to define areas of a Ground Model in which height correction is required
  • to represent voids when generating a 2D mesh
• Storage Areas - used to define the plan area at ground level of a storage or pond node
• 2D Zones - used as the bounding polygon for a 2D mesh
• Mesh Zones - used to divide a 2D Zone into regions of different mesh resolution
• Mesh Level Zones - used to define areas in which mesh element elevations are to be modified based on ground model elevations or user-defined values
• Roughness Zones - used to divide a 2D zone into regions of different roughness
• 2D IC Zones (hydraulic, sediment, water quality and infiltration) - used to define areas in which initial condition values apply within a 2D mesh
• Porous Polygons -used to represent enclosed walls of specified porosity and height
• Infiltration Zones (2D) - used to define areas within the 2D Zone to which infiltration will be applied
• Infiltration Surfaces (2D) - not a polygon object, but associated with an Infiltration Zone to provide infiltration characteristics
• Turbulence Zone (2D) - used to represent the physical area in which eddy viscosity is to apply
• Turbulence Model (2D) - not a polygon object, but associated with a 2D Zone or Turbulance Zones (2D) to provide turbulence characteristics
• Permeable Zone (2D) - used to provide a link between infiltrated volume from the 2D surface into the 1D system
• TVD Connectors - used to create a link between data streams in a time series data object and the network. May have point or polygon geometry
• Spatial Rain Zones - used to define areas within the network to which rainfall will be applied (applicable to Spatial Time Series Data objects only)
• Spatial Rain Sources -used to specify rain sources to be applied to spatial rain zones during simulation, as well as their priority (valid for Spatial Time Series Data objects only)
• Network Results Polygons (2D) - used to interrogate results within a 2D mesh
• Risk Impact Zones - used to aggregate the results from individual Damage Receptors into geographical groupings
• Buildings - used to represent rain falling onto a roof of a building and entering the drainage system and/or remaining on the surface. They are also used to define an area where roughness, mesh levels and porosity are applied within a 2D mesh
• ARMA model - not a polygon object but may be associated with a TVD connector and a subcatchment. It defines the type of error calculation to be performed and the autoregressive (AR) and the moving average (MA) coefficients to be used in the ARMA predictions.

The following table describes all the data required to define a polygon.