There are six modules for rivers work: HEC RAS Advanced, XP SWMM, Mike 11, UNET and ISIS.

These modules create the natural cross section files for HEC RAS, XP-SWMM, XP-UDD, Mike11, UNET and ISIS respectively. The water level results from these packages can then be read back into 12d to create a detailed water surface that accurately defines the river bank between the defined cross sections. This water surface is used to create 3d images, movie files of flight or walks down the river, cross section plots. river profiles and plan drawings coloured and contoured by depth.

Historical flood data can also be presented in 12d Model using the "river mapper". This interface creates a water surfaces from existing water level data. The interface uses "shape strings" to add incredible power and flexibility to the mapping process. Meandering streams and off line storages can easily be mapped without burdening your hydraulic modelling package with additional cross section calculations.

The 12d Model Rivers modules read numerous data formats including HEC2 data, EEBY cross section data, USGS DEM formats and xyz data. The add on AutoCAD DWG/DXF and Microstation DGN modules enable existing drawing/elevation data to be imported to 12d. Elevation data can be combined from several sources and manipulated to form a final ground surface from which cross section data is created.

The modules generate cross sections, measure channel and overbank distances, mark left and right bank locations and automatically mark levee locations for HEC RAS. User specified steady state discharges and Manning's "n" values are exported as initial starting values.

Raster georeferenced images (which can exceed one gigabyte in size) can be used as backdrops for defining your river bank locations. For simple projects, channel improvements are easily designed and volumes calculated using 12d Model Base. Complex designs and volumes may require other modules.

The Rivers modules are:

HEC RAS Advanced, XP SWMM & MIKE 11

These river interface modules work on branched river systems. The complete project is created for the river design programs and for unsteady flow conditions. The maximum water levels are read back into 12d Model.

UNET

In addition to cross section data, this module also exports reservoir storage areas.

ISIS