Tuflow and estry manual Version 3

3.3Data Requirements

The minimum data requirements for setting up a 2D/1D hydraulic model are:

1. 
   A DTM with sufficient resolution and accuracy to depict the topography of all flowpaths and storage areas in the 2D domain(s). The vertical accuracy depends on the modelling objectives and budget constraints, however, for large scale models 0.2m is preferred, whilst for fine-scale urban models <0.1m is recommended. The vertical accuracy is dependent on the typical depths of inundation in key areas.
   
2. 
   Cross-sections for any 1D flowpaths.
   
3. 
   If bed resistance varies over the model, geo-corrected aerial photography or other GIS layer from which material (land-use) zones are digitised for setting Manning’s n values.
   
4. 
   Boundary conditions (eg. ocean water levels, catchment inflows, rainfall, evaporation, etc).
   
5. 
   Calibration data locations as points in a GIS layer. Peak levels should be attached as attributes to the calibration points.
   
6. 
   Surveys of key hydraulic controls such as levees / embankments (3D breaklines), culverts, bridges, etc.