As the bulk of the data input is via GIS data layers, efficient management of these data is essential. For detailed modelling investigations, the number of TUFLOW GIS data layers can reach over a hundred. Good data management also caters for the many other GIS layers (aerial photos, cadastre, etc) being used.
It is strongly recommended that the prefixes described in Table 2 .3 be adhered to for all 1D and 2D GIS layers. This greatly enhances the data management efficiency and, importantly, makes it much easier for another modeller or reviewer to quickly understand the model.
Data input is structured so that there is no limit on the number of data sources. Commands are repeated indefinitely in the text files to build a model from a variety of sources. For example, a model’s topography may be built from more than one source. A DTM may be used to define the general topography, while several 3D elevation lines (breaklines) define the crests of levees. The “build-a-model” approach offers unlimited flexibility and efficiency.
Table 2.3 GIS Input Data Layers and Recommended Prefixes
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