| Description | Backward Compatibility Command |
|---|---|
Reset all defaults to that used by the 2025 release. |
Defaults == PRE 2026 |
A new TIN triangulation method, Method B, has been implemented, which enforces breaklines, produces more balanced triangulations, and is more robust compared to the original Method A . |
TIN Triangulation Approach == Method A |
A new HPC wetting and drying approach, Method C, has been implemented. The new approach computes infiltration for wet cells, and dry cells with positive rainfall rate until the depth reaches the drying depth. This method prevents cells from repeatedly alternating between dry and wet states, and is more robust compared to the previous default Method A (for non-SGS models) or Method B (for SGS models). See Section 8.2.2.4. |
HPC Infiltration Drying Approach == Method A | Method B |
Head loss due to the form loss defined by 2d_lfcsh and 2d_bg layers can become underestimated when the hydraulic structure is rotated against the 2D mesh. A new form loss adjustment approach has been implemented to solve the issue. |
|
Soil porosity has been removed from the horizontal groundwater flux calculation. Previously the horizontal groundwater flux was factored by soil porosity, which could lead to the selection of horizontal conductivity higher than industry standard range. |
|
A new option to reduce the groundwater flux based on the power function of relative saturation has been added to HPC. This feature is not applied by default to the vertical flux, and can be applied to the horizontal flux optionally. The primary reason to implement this feature to the vertical flux calculation is to improve the timing of vertical infiltration in multi-soil layered models. For backwards compatibility, set this exponent to zero. See Section 7.3.5.2.3. |
Groundwater Vertical Flux Model == Darcy’s Law | 0 |
The negative portion of a depth vs discharge curve can now be defined for models with surcharging Q pits (Section 4.11 of Changelog). Previously, the negative portion was ignored by Q pits. |
There is no backward compatibility setting. However, the negative portion of the depth vs discharge curve can be removed to produce results identical to pre 2026.0. |
18 Default Changes
This chapter lists default changes between major releases. For a full list of changes (not only default changes) between releases, see the TUFLOW Classic/HPC Changelog. For releases 2023-03-AF and prior, see the relevant release notes in the TUFLOW Downloads Archive.
18.1 2026.0 Release
Table 18.1 outlines the changes made to the default settings for the 2026.0 release and lists commands to revert the settings to those used by the prior major release group (2025). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2026”, or can be reverted individually using the commands in the table below. For more information, see the TUFLOW Classic/HPC Changelog.
2026.0 release upgrades the CUDA compiler (for GPU hardware) to CUDA version 12.9 and the Fortran compiler from the deprecated Intel ifort to the more modern Intel IFX Fortran. Due to this compiler update, even when switching defaults back to previous settings, the results are not guaranteed to match previous releases. It is recommended that when switching to this release with an established model, that test runs are carried out and comparisons made between the old and new releases to ensure that any changes are understood.
18.2 2025.0 Release
Table 18.2 outlines the changes made to the default settings for the 2025.0 release and lists commands to revert the settings to those used by the prior major release group (2023-03). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2025”. For more information on changes, see the TUFLOW Classic/HPC Changelog.
| Description | Backward Compatibility Command |
|---|---|
Reset all defaults to that used by the 2023-03 release. |
Defaults == PRE 2025 |
The format of a TIN written when the WRITE TIN command is used with Z Shapes or write TIN commands was changed. The new default (2DM) writes the TIN using the SMS 2DM mesh format, which can be read in by QGIS and SMS. The previous default (SMS TIN) wrote a TIN that could only be read by SMS. |
TIN Output Format == SMS TIN |
The default value for the HPC HQ Boundary Filter Constant has been set to 5. This can provide improved stability for HQ boundaries. For backwards compatibility, set this to 1. See Section 8.2.2.2. |
|
Internally, HPC multiplies the Nu, Nc, Nd control number limits by a dynamic control factor. Method A considers that a high control number step has occurred if any of Nu, Nc, Nd has exceeded the dynamic control number limits (i.e. after the dynamic control factor has been applied) by the 20% margin. Method B (the 2025.0 default) applies the test using the original static limits (i.e. before the dynamic control factor has been applied). For more information see Section 3.4.4. |
HPC Timestep Approach == Method A |
A CHECK option has been added to the HPC DP Check command and set as the new default. This downgrades the previous default from ERROR. For more information see Section 13.3.2.2. |
HPC DP Check == ERROR |
18.3 2023-03 Release
Table 18.3 outlines the changes made to the default settings for the 2023-03 release and lists commands to revert the settings to those used by the prior major release group (2020-10). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2023”. For more information on changes, see the 2023-03 Release Notes.
| Description of Change | 2023-03 Release Notes | Backward Compatibility Command |
|---|---|---|
SGS Depth Output |
SGS Depth Output == Exact |
|
Mapping of partially wet SGS cells |
SGS Map Extent Full == h |
|
SGS Approach |
SGS Approach == Method B |
|
High Resolution raster output interpolation method |
HR Interpolation Approach == Method C |
|
High resolution thin breaklines |
||
Initial Moisture and Green-Ampt infiltration |
No specific command - Defaults == Pre 2023 |
|
Duplicate Materials IDs |
No specific command - Defaults == Pre 2023 |
|
Duplicate Soil IDs |
No specific command - Defaults == Pre 2023 |
|
HPC Weir Approach |
HPC Weir Approach == Method A |
|
Upper limiting Manning’s n in Wu turbulence calculation |
Viscosity Coefficient == <C3D, C2D, 99> |
|
HPC SX Momentum |
HPC SX Momentum Approach == Method A |
|
Change to quadtree handling of inertial parallel to boundary |
Quadtree BC Parallel Inertia Approach == Method A |
|
HPC Boundary Approach |
HPC Boundary Approach == Method B |
|
2d_bc QT Point Boundaries (Classic/HPC) Unsupported |
No specific command - Defaults == Pre 2023 |
|
2d_bc HQ Point Boundaries (Classic/HPC/Quadtree) Unsupported |
No specific command - Defaults == Pre 2023 |
|
Duplicate SA Boundaries |
No specific command - Defaults == Pre 2023 |
18.4 2020-10 Release
Table 18.4 outlines the changes made to the default settings for the 2020-10 release and lists commands to revert the settings to those used by the prior major release group (2020-01). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2020-10”. For more information on changes, see the 2020-10 Release Notes.
| Description of Change | 2020-10 Release Notes | Backward Compatibility Command |
|---|---|---|
Quadtree only thick z-shapes and boundaries fix |
No backward compatibility setting. |
|
Quadtree only Wu turbulence fix |
No backward compatibility setting. |
|
Timestepping change |
No backward compatibility setting. |
|
Apply material losses to global rainfall for TUFLOW Classsic, overwriting any global losses. |
||
Fixes accumulation of both material losses and global losses for global rainfall for TUFLOW HPC. |
No backward compatibility setting. |
|
Support for Classic style HQ curve |
HPC HQ Boundary Approach == CELL |
|
Relative filepaths for GIS workspaces |
GIS Project Path Format == ABSOLUTE |
|
Vector output at dry Z points |
||
Map cutoff for vector output values |
Map Cutoff Vector == OFF |
18.5 2020-01 Release
Table 18.5 outlines the changes made to the default settings for the 2020-01 release and lists commands to revert the settings to those used by the prior major release group (2018-03). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2020-01”. For more information on changes, see the 2020-01 Release Notes.
| Description of Change | 2020-01 Release Notes | Backward Compatibility Command |
|---|---|---|
Turbulence scheme changed |
Viscosity Formulation == Smagorinsky |
|
Improvement to dry wall treament for eddy viscosity |
Viscosity Approach == Method A |
|
Flow depth used for bed friction calculation |
HPC Mannings Depth Approach == Method A |
|
Improvement to HPC water level boundaries |
HPC Boundary Approach == Method A |
18.6 2018-03 Release
Table 18.6 outlines the changes made to the default settings for the 2018-03 release and lists commands to revert the settings to those used by the prior major release group (2017-09). There is no “Defaults == Pre 2018” command provided for the 2018-03 release. For more information on changes, see the 2018-03 Release Notes.
| Description of Change | 2018-03 Release Notes | Backward Compatibility Command |
|---|---|---|
For TUFLOW HPC an enhancement to the extrapolation of Pit curves to provide consistency with Classic was implemented. |
||
The treatment of unconnected pits, which previously would trigger an ERROR, has changed to apply these pits as a virtual pipe pit that discharges water directly out of the model. |
Pit No 1D Connection == ERROR |
|
Advanced index feature added to significantly improve 1D/2D model simulation speeds. |
Index 1D2D Links == OFF |
18.7 2017-09 Release
Table 18.7 outlines the changes made to the default settings for the 2017-09 release and lists commands to revert the setting to those used by the prior major release group (2016-03). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2017”. For more information on changes, see the 2017-09 Release Notes.
| Description of Change | 2017-09 Release Notes | Backward Compatibility Command |
|---|---|---|
XF files are now being processed for boundaries. |
Set Defaults == PRE 2017 or use XF Files Boundaries == OFF if similar results are required to the 2016-03-AE release. |
|
Material IL and CL now applied to gridded rainfall (previously not applied). |
No backward compatible workaround provided. |
|
SA regions now always select a 2D cell even if there are no cell centres falling within the region (previously a SA region would not select any cell if no cell centres fell within the region). |
No backward compatible workaround provided. |
|
Regions in 2d_bc layers now applied as regions (previously only cell over region centroid selected). |
No backward compatible workaround provided. |
|
New SX boundaries defaults. |
Set Defaults == PRE 2017 if similar results are required to the 2016-03-AE release. |
|
If using “Reveal 1D Nodes == ON”, “Time Series Output Interval ==” must be specified. |
No backward compatible workaround provided. |
18.8 2016-03 Release
Table 18.8 outlines the changes made to the default settings for the 2016-03 release and lists commands to revert the setting to those used by the prior major release group (2013-12). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2016”. For more information on changes, see the 2016-03 Release Notes.
| Description of Change | 2016-03 Release Notes | Backward Compatibility Command |
|---|---|---|
New operational 1D structure defaults. |
Set Defaults == PRE 2016 if similar results are required to the 2013-12-AC release. |
|
Primary upstream and downstream 1D channels now correctly take into account bed slope. |
Set Defaults == PRE 2016 if similar results are required to the 2013-12-AC release. |
|
A new layered 2D FC calculation method has been implemented. |
Set Layered FLC Default Approach == CUMULATE or use Defaults == PRE 2016 if similar results are required to the 2013-12-AC release. |
|
The SX Flow Distribution Cutoff Depth has been raised to 0.005m from 0.0m. |
Set Defaults == PRE 2016 or use SX Flow Distribution Cutoff Depth == 0.0 if similar results are required to the 2013-12-AC release. |
|
The “End After Maximum ==” tolerance has been increased to 0.001m from 0.0m. |
Set Defaults == PRE 2016 if similar results are required to the 2013-12-AC release. |
|
A new ERROR message has been added to cross-check the 1D timestep is a multiple of the timestep for all 2D domains. |
Set Defaults == PRE 2016 if similar results are required to the 2013-12-AC release. |
|
WARNING 2460 has been escalated to an ERROR and stricter command line syntax rules have been introduced (“=” will now return an ERROR message if TUFLOW is expecting “==”) |
Set Defaults == PRE 2016 if similar results are required to the 2013-12-AC release. |
|
The treatment of the eddy viscosity term in the GPU Solver has been enhanced in the 2016-03-AD build with slightly improved results in areas of rapidly changing velocity patterns. |
Set Defaults == PRE 2016 to achieve the same results as Build 2013-12-AC and prior. |
18.9 2013-12 Release
Table 18.9 outlines the changes made to the default settings for the 2013-12 release and lists commands to revert the setting to those used by the prior major release group (2012-05). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2013”. For more information on changes, see the 2013-12 Release Notes.
| Description of Change | 2013-12 Release Notes | Backward Compatibility Command |
|---|---|---|
The approach for processing 2d_po flow lines has been reworked and will now not slow down a simulation if numerous 2d_po flow lines exist as was occurring with prior releases. |
PO Approach == METHOD A |
|
Tracks and outputs the maximums every timestep. |
Maximums and Minimums == OFF |
|
When the Maximum Courant Number is greater than zero, adaptive time-stepping is switched on. For the 4th order time solver a value of 1.0 (the new default) is recommended. |
Maximum Courant Number == 0.3 (only applies if GPU Solver == ON) |
|
New interpolation/extrapolation methods to the 2D cell corners. |
Map Output Corner Interpolation == METHOD A |
|
Output 1D .csv files to a csv folder in a slightly new format that works with our new GIS 1D chart viewer. |
Time Series Output Format == PRE 2013 |
|
For BW or IW channels that automatically insert a weir over the B or I channel, the weir width if not manually specified using the EN1 attribute is now based on the maximum width of the B or I channel, rather than the width at the channel’s invert. |
Structure Routines == ORIGINAL |
|
“E” and “H” flags for RG, SG, SP and all new weirs set whether to use energy (E) or water surface (H) levels for the calculations. |
Structure Flow Levels == WATER |
|
Changes the default to “INCLUDE TIME” for restart files so filenames are time-stamped and written for each restart output time, and the files are placed in a folder called “trf”. |
Write Restart Filename == OVERWRITE |
|
For W (weir) channels, “Weir Approach == METHOD A” has been reinstated as the default setting. |
Weir Approach == METHOD B |
|
The default setting for Link 2D2D Approach has changed. |
Link 2D2D Approach == METHOD B |
18.10 2012-05 Release
Table 18.10 outlines the changes made to the default settings for the 2012-05 release and lists commands to revert the setting to those used by the prior major release group (2011-09). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2012”. For more information on changes, see the 2012-05 Release Notes.
| Description of Change | 2012-05 Release Notes | Backward Compatibility Command |
|---|---|---|
Proportions SA inflows according to the depth of water. This feature also enhances SA inflows by applying an inflow in proportion to the depths of water of the wet cells contained within the SA polygon. |
SA Proportion to Depth == OFF |
|
Tracking of maximums and minimums every timestep for PO and LP output made available and set as default. |
||
Enhanced wetting algorithm that provides significant improvement to inflows on steep areas (eg. direct rainfall models), whilst maintaining low mass error, greater stability and often larger timesteps. |
Wetting and Drying == ON (2012-05 default is Wetting and Drying == ON METHOD B) |
|
The approach to the sizing of automatic manholes and the application of losses has been enhanced. |
Manhole Approach == METHOD A |
|
The default viscosity coefficients have been changed to 0.5 Smagorinsky coefficient and 0.05m2 /s constant. |
Viscosity Coefficient == 0.2, 0.1 |
|
Uses an improved method for interpolating into the matrix for 1d_nwk M channels. |
M Channel Approach == METHOD A |
|
Enhancement to automatic 2D HQ boundaries that if the consecutive flow values are the same. |
HQ Boundary Approach == METHOD A |
18.11 2011-09 Release
Table 18.11 outlines the changes made to the default settings for the 2011-09 release and lists commands to revert the setting to those used by the prior major release group (2010-10). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2011”. For more information on changes, see the 2011-09 Release Notes.
| Description of Change | 2011-09 Release Notes | Backward Compatibility Command |
|---|---|---|
The optimised compiler code is treated differently for Single Precision builds producing slightly different results (fractions of a mm) for some models. |
No workaround. |
18.12 2010-10 Release
Table 18.12 outlines the changes made to the default settings for the 2010-10 release and lists commands to revert the setting to those used by the prior major release group (2009-07). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2010”.
| Description of Change | 2010-10 User Manual | Backward Compatibility Command |
|---|---|---|
New Intel Fortran Compiler version produces slightly different results (usually fractions of a mm). |
No workaround. |
|
w32 and w64 versions will give slightly different results for the same simulation. |
No workaround. Use the same platform (w32 or w64) for all simulations. Use Model Platform to force which platform should be used. |
|
New default settings. |
Set Defaults == PRE 2010-10 if similar results are required to the 2008-08 or 2009 07 releases. |
|
Generation of TINs for polygons in Read GIS Shape layers is more robust and uses an improved approach. In rare cases, the TIN would fail and TUFLOW would abort the start-up. |
No workaround. |
18.13 2009-07 Release
No default changes were made in the 2009-07 release. For feature changes, see the 2009-07 Release Notes.
18.14 2008-08 Release
Table 18.13 outlines the changes made to the default settings for the 2008-08 release and lists commands to revert the setting to those used by the prior major release group (2007-07). All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2008-08”. For more information on these changes, see the 2008-08 Release Notes.
| Command Change | Description of Change |
|---|---|
Uses a new set of defaults for a number of commands. |
The new defaults produce slightly different results, and very slight differences also occur between the three versions offered. For established models run using the 2007-07-XX builds, use Defaults == PRE 2008-08 to use the default settings used by the 2007-07-XX builds. Testing of a range of models has shown zero change in results if Defaults == PRE 2008-08 switch is set, and the Compaq Fortran compiled version (cSP) is used. Each of the new default settings and their effects are discussed in the rows below. |
The method for interpolating n values where the 2D Manning’s n varies with depth has been enhanced from a linear interpolation of the M (1/n) value to a spline interpolation of the n value. See Bed Resistance Depth Interpolation == . |
Generally has little effect other than when the flow is predominantly in the depth range that the n value is varying. The new approach offers a smoother transition in n values from one depth to the other. |
The default viscosity coefficient is now a combination of a 0.2 Smagorinsky and 0.1 constant coefficient, and there are some enhancements to the application of the viscosity term. See Viscosity Coefficient. |
This has slight effect for the majority of models. For fine grid models (<2m cell size) with low bed resistance and significant variations in velocity vectors the effect is more pronounced but is still slight. |
Inertia and viscosity terms are now not transferred across dry cell sides when constructing the coefficients for the solution arrays. This was having the effect of generating a circulation on the other side of the wall (albeit a very weak one), which of course shouldn’t happen! |
Generally little effect, but can have some minor influence for urban models where buildings and fences are modelled as solid thin Z lines. |
1D weir flow has been improved as the water level difference across the weir approaches zero. The new method is more stable. See Weir Flow. |
Very little difference other than improved stability. |
Incorporates minor improvements for transitioning between Regimes A and B, and between inlet and outlet controlled regimes, for circular culverts. |
Very little difference other than improved stability. |
The new automatic selection of cells for 2D SX connections using the 1d_nwk Conn_1D_2D attribute may choose more than one 2D cell. |
Very little difference other than improved stability at the pit 2D connections. |
The default setting for Shallow Depth Stability Factor has changed in the 2008-08-AC release. |
Set Shallow Depth Stability Factor == 3 for models without direct rainfall to achieve the same results as Builds 2008-08-AA and 2008-08-AB. See Shallow Depth Stability Factor for more information. |
18.15 2007-07 Release
Table 18.14 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
| 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. |
18.16 2006-06 Release
Table 18.15 outlines the changes made to the default settings for the 2006-06 release and lists commands to revert the setting to those used by the prior release. All default settings can be reverted to the prior release by using the command, “Defaults == Pre 2006-06-AA”.
| Command Change | Description of Change |
|---|---|
Uses a new set of defaults for a number of commands. |
The new defaults will produce different results. For established models run using the 2005-05-XX builds, use Defaults == PRE 2006-06-AA to use the previous default settings. Each of the new default settings and their affects are discussed in the rows below. |
Cell Wet/Dry Depth == 0.002 (previously 0.05) and Cell Side Wet/Dry Depth == 0.001 (previously 0.03) |
The most pronounced effect of the shallower wet/dry depths is likely to occur in areas that are still filling at the flood peak, such as behind a levee that is only just overtopped. The shallower wet/dry depths provides a greater flow depth for a longer period over the levee. |
Adjust Head at ESTRY Interface == OFF (previously ON) |
Usually does not have a major influence on results except where very high velocities occur. |
Boundary Cell Selection == Method C (previously Method A) and Line Cell Selection == Method C (previously Method A) |
May select slightly different cells along boundary/link lines. This may cause a difference where the line is along the top of levee, possibly creating a “hole” in embankment. |
Viscosity Formulation == Smagorinsky (previously Constant) and Viscosity Coefficient == 0.2 (previously 1.0) |
Can have a significant effect where the viscosity term is influential. This occurs where the friction term is less dominant (i.e. low Manning’s n and/or deeper water such as the lower, tidal, reaches of rivers). |
Structure Losses == ADJUST (previously FIX) |
Can have a significant affect in the vicinity of structures within a 1D network and for culvert networks. Does not affect 1D structures linked to a 2D domain or at the structure ends not connected to another 1D channel. |
Storage Above Structure Obvert (%) == 5 (previously CHANNEL WIDTH) |
Usually negligible effect unless the model storage is predominantly within 1D closed sections (i.e. B, C and R channels). The 1D domain is likely to be more sensitive to instabilities due to the much smaller storage above the top of the closed sections, and a smaller 1D timestep may be required and/or the Storage Above Structure Obvert (%) increased. |
Depth Limit Factor == 10 (previously 1) |
No effect as previously the model would have become ““unstable”” as the trigger for an instability was the top of the channel/node. |
Culvert Flow == Method C (previously Method B) |
Usually only minor effects plus improved stability. |
Culvert Add Dynamic Head == ON (previously OFF) |
Minor influence. |
Bridge Flow == Method B (previously Method A) |
Negligible influence plus improved stability. However, note the different treatment of energy losses once the bridge deck obvert/soffit is submerged if a BG or LC table is specified. |
WLL Approach == Method B (previously Method A) |
Only affects the presentation of results. Note, that Method A is no longer recommended or supported. |
Apply All Inverts == ON (previously OFF) |
Does not affect hydraulic calculations, however, if a Blank, B or W channel is now lowered/raised because the inverts are now used, this will affect results/stability - see note at end of Apply All Inverts). |
18.17 Pre 2006-06 Release
For backward compatibility of builds prior to the 2006-06 release, contact support@tuflow.com.
