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Overview of Network Geometry

The 1D engine simulates water flow on a network. A network consists of

  • Reaches
  • Nodes
  • Grid points
  • Digi points
  • Cross sections
  • Structures

shows an example of a small network with four nodes and three reaches, each having a number of grid points and digi points. Note that the figure does not show the shape of cross sections or structures.

Example of network

Figure: Example of network.

A cross section is the 2D intersection of a channel (typically a river or a sewage pipe), perpendicular to the channel direction. Among other things, cross sections determine the volume of water in a channel for a given water depth. For a detailed description of the cross sections, see Chapter 3.

A structure is a parameterised model that can calculate a flow over (or through) the structure based on an upstream and downstream water level. Examples are weirs, gates, orifices and pumps. For a detailed description of structures, see Chapter 6.