Reference &  User Manual 
  Release Level 7.0 Release Date 2016 12 Revision Level beta  
Last modified on:   Saturday, 5-Nov-16 17:33 CET

Topological Network Structure

The water resources model WRM is implemented as a topological network model, consisting of NODES, connected by REACHES. A well formed network must have at least one START (inflow) node and at least one END (outflow) node.

A network can represent any "hydraulically coupled system", which is not necessarily a river basin or catchment, but can be any arbitrary part, or the combination of several basins/parts including interbasin transfers.

  • NODES produce (an upstream catchment, a well), store (a reservoir), or consume water (an irrigation district), or change its quality (a treatment plant);
  • REACHES transport (route) water between NODES, by open channel gravity flow, or through pipelines, pumped or by gravity flow.

The resulting network is not necessarily a true spatial" representation; its underlying principle is "logical connectivity" rather than geographic location.

Similarly, the association between NODES, REACHES, and underlying aquifers is a gain a logical one, i.e., network OBJECTS are "assigned" to an aquifer explicitly rather than implicitly by location. A similar logic is used to assign (spatial) meteorological parameters (precipitation, temperature) to objects that have a defined extent (e.g., for lateral inflow along reaches, or the immediate catchment of a reservoir, or evapotranspiration losses).

Nevertheless, a network can be "mapped" as the NODE attributes can include geographic coordinates.

Among the advantages of the network structure is the "arbitrary precision" or resolution that it supports compared to any fixed grid representation.

© Copyright 1995-2016 by:   ESS   Environmental Software and Services GmbH AUSTRIA | print page