18.14 2007-07 Release

Table 18.13 outlines the changes made to the default settings for the 2007-07 release and lists commands to revert the setting to those used by the prior major release group (2006-06). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2007-07-AA”. For more information on these changes, see the 2007-07 Release Notes

Table 18.13: Default Changes in the 2007-07 Release and Backward Compatibility to 2006-06

Command Change	Description of Change
Uses a new set of defaults for a number of commands.	The new defaults may produce slightly different results. For established models run using the 2006-06-XX builds, use Defaults == PRE 2007-07-AA to use the default settings used by the 2006-06-XX builds. Each of the new default settings and their affects are discussed in the rows below.
Change Zero Material Values to One == OFF (previously ON)	Will not cause different results if a Set Mat == 1 is specified before other material settings in the .tgc file, or if every cell has been assigned a material value.
Inside Region == Method B (previously Method A)	Testing thus far has not shown any difference between the two methods (other than the substantial gains in processing time of polygons).
Line Cell Selection == Method D (previously Method C)	May change results slightly, but improved stability and a smoother water levels along HX lines result.
VG Z Adjustment == MAX ZC (previously ZC)	May change results slightly, but stability should be significantly enhanced in some situations.
Bed Resistance Cell Sides == INTERROGATE (previously AVERAGE M)	Will influence results, usually slightly, but more pronounced where there are sudden changes in Manning’s n values such as in the urban environment.
Culvert Flow == Method D (previously Method C) Culvert Critical H/D == OFF (previously 1.5)	The most significant influences are the selection of upstream or downstream controlled regimes depending on the H/D ratio, and the bug fix relating to Regime E if Structure Losses == ADJUST. Offers improved stability, better convergence for Regime C and smoother transitioning between some regimes.
Changed the setting of the default width (if eN1 < 0.001) of automatic weirs over R and C channels (i.e. RW and CW) to be the diameter/width multiplied by the number of culverts (previously, the width was not multiplied by the number of culverts).	For backward compatibility, original weir width can be set by manually setting the eN1 attribute to the Diameter_or_Width attribute value of the culvert.
Bug fix that when using a restart file TUFLOW occasionally set the 2D FC bridge deck additional loss value incorrectly.	No backward compatible workaround provided.
Bug fix that incorrectly set the water levels on dried VG cells (only applies to simulations with source inflows, e.g. SA or RF, somewhere within in the model).	May cause slight changes in results. Backward compatibility provided if Defaults == PRE 2007-07-AA is set (noting that setting this command reinstates the bug). This bug also causes the mass error calculations to falsely give a mass error that is not occurring.
Fixed bug that did not correctly apply the reduction in conveyance for a FC BD (bridge deck) of FD (floating deck) cell using the 2d_fc Mannings_n attribute.	Backward compatibility applied if Defaults == PRE 2007-07-AA is set, however, note that this reinstates the bug and the resistance to flow at FC BD and FD cells may need to be reviewed. Indications are that only minor changes in results occur. The flow area under 2D FC BD and FD cells is correctly calculated.