Feature Questions

    1. How do I add pipes to my existing model?
    2. Is HYDRA compatible with AutoCAD 2000/2000i/2002/2004/2005/2006?
    3. Is HYDRA compatible with Windows 2000/XP?
    4. How can I change the direction of flow arrows in Topology view?
    5. Why do my profiles appear correct in the detail window, but not in the regular profile window? 
    6. Why is there no hydrograph or profile displayed in results?
    7. Why did the data in my database file disappear?
    8. How can I change Hydra’s default “snap tolerance”?
    9. What files are required for project data review?
    10. How can I compare analysis run input data?
    11. How can I view hydraulic results based on Q/Q?
    12. How can I update Hydra data using Microsoft Access?
    13. Can I have multiple versions of Hydra installed on the same computer?
    14. How do I use a different Hydra engine version for analysis?


How do I add pipes to my existing model?
If you are working with AutoCAD as your graphical drawing tool, you will need to export the layer DXA file from your project and import it back into AutoCAD using the GISMaster tool.  This will ensure that your numbering system and the corresponding data associations will remain intact.  Once you have made any necessary changes, register the entities again and put the new DXA file in your project directory again.  When you load the layer again in HYDRA, it will add data records for the new pipes.

If you are working with ArcView or other CAD or GIS program, you will need to export the layer out of HYDRA using the GIS Layer Wizard tool.  Be sure to include your unique identification numbers, especially the G_ID, in the export.  Make your edits, then import the data back into HYDRA, again being sure to include both the G_ID and any other unique identification numbering you have.  When you load the layer again in HYDRA, it will add records for the new pipes and resynchronize the database based on the value in the G_ID field.

NOTE: Always be sure to create a back up copy of your data before any major update procedure!

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Is HYDRA compatible with AutoCAD 2000/2000i/2002/2004/2005/2006?

Yes.  We have an update for the GISMaster utility that works with AutoCAD 2000/2000i/2002/2004/2005/2006.  Click here for program loading instructions.

You can also import an AutoCAD drawing into HYDRA by saving it as an AutoCAD 14 format DXF file and using the GIS Layer Transfer Wizard to convert it to a HYDRA DXA file.  See the on-line help for the Layer Wizard for more details.

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Is HYDRA compatible with Windows 2000/XP?

HYDRA was designed to run on Windows 95, Windows 98, or Windows NT, so we recommend continuing to use those operating systems if possible.  HYDRA does run on Windows 2000, although during preliminary testing and use, there have been some problems. One known problem is inability to open project data when using non-standard mouse settings.

Preliminary tests with Hydra 6 on Windows XP have been trouble free.

We will continue to post information on compatibility as it becomes available.

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How can I update Hydra data using Microsoft Access? 

Microsoft Access is a useful tool for working with Hydra.  You can use Access to edit or manipulate Hydra’s databases.  This is especially useful for updating a few fields in an existing Hydra layer, such as your SY_.DBF, or changing the ID numberings in source tables to be imported into Hydra using GIS Layer Transfer Wizard.  Be sure to back up your data before attempting
this!

1.  Attach your Hydra .DBF file to the Access MDB by selecting File / Get External Data / Link Tables…

2.  Create a new Query using Design View.

3.  Add the appropriate tables to the Query, such as the source and target databases.

4.  For a data join, create a link between source and target fields by clicking and dragging between them.

5.  From the Query menu, select Update Query.

6.  Drag the target field to the lower grid in the Query Design View.

7.  In the “Update To” row, put the name of the source field.  For example:  “[mysourcedata]”, or
“[my_id] + 10,000”.

8.  From the Query menu, select “! Run”.

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How can I change Hydra’s default “snap tolerance”?

Hydra defaults to a 1-unit snap tolerance for the collection system drawing.  In the case of a metric project, when 2 nodes are less
than 1 meter in distance, you can specify a smaller snap tolerance.  In the PROJECT.INI file, under the [Hydra] section, add a line to specify the fraction of a unit: DXA Epsilon=0.1

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How can I change the direction of flow arrows in Topology view?

You do not need to re-digitize your drawing!  The flow direction arrows are displayed based on the drawing and data on how your pipes, diversion, etc are related.  Your topology-related data must be complete and correct.  Please carefully read the section in the Users Manual “Understanding Topology Data”.  Correct any “breaks” in the conveyance system using the Snap Nodes to Pick command in the Topology menu.  Check your data on entity types (SY_TYPE) and overflows (SY_IDOVER field).  Then, select Verify System Continuity from the Topology menu to refresh the direction of flow displayed.  If you have further problems with topology, please call technical support for further troubleshooting.

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How can I show hydraulic results based on Q/Q? 

Hydra outputs DESIGNQ, which is the total calculated gravity flow, and EPI_QFULL, which is the total flow capacity for that pipe. You can export these fields to an ASCII file for use in other programs.

Within Hydra, to highlight all pipes with a certain Q/Q, in results view, go to the menu Results / Results Selection Set Query.
Click on the View SQL button to open the SQL text box. The text in your SQL text box would look like this: SELECT [TAG] AS G_ID FROM CombinedFields WHERE [DESIGNQ]/[EPI_QFULL] > 1.25 AND RUNID=3

Click on the Do It button to run the Query.  Repeat for other values and other highlighting colors.

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How can I compare analysis run input data?  

A great shareware tool to use is called Visual Merge v4.01 by Olga and Victor Golosovker.  You can easily download this from the
World Wide Web.  It allows you to compare 2 text files (ie Hydra Command Files or Flow Files) side by side, and it highlights the
differences for your review.

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Why do my profiles appear correct in the detail window, but not in the regular profile window? 

This display problem is caused by a manhole without data in the invert elevation fields.  Input data for SY_INVUP and SY_INVDN fields, then run an analysis again.  The profile should then display correctly.

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Why is there no hydrograph or profile for the outfall? Why is there no hydrograph for other entities?  

Hydra does not display results for the outfall node entity because it is not a analytical entity.  The Hydra analysis ends on a link
entity.  If you need to see results for your outfall entity, add a short “dummy” pipe and node immediately before the outfall.

For other types of entities, if you don’t see a hydrograph in the results:

Make sure SE_CONNECTS is completed and updated.
Make sure you have selected all desired File Files, including flows for this entity.
Check the Safety Factor Values.  Are they set to zero? They should be set to “1” unless you are doing design work. 


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Why did the data in my database file disappear?

Problems with database files can be caused by many things. First, make sure all the data in your Project Directory is read/write, not
read-only.  To check this, in File Explorer, click on the files, then right-click on File Properties.

You can also delete .NDX and .INF files.  These index files can become corrupt and can cause access problems with databases.

If you have had a problems with your Defects database, check in your Project Directory for a file called DEFOLD.DBF.

For SY_, SE_, LU_, or DR_ databases, if you are updating your drawings, make sure you followed the procedure of exporting from Hydra before making changes.  See “Editing Existing Layer Graphics” on page 43 of the Hydra Users Manual.

Also, make sure your layer name follows the 8-character file name convention.

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What files are required for project data review?  

If you are sending your Hydra project files either to Pizer Technical Support or another engineer in your own organization for
review of your modeling data, you need to include the following into a zip file:

PROJECT.*  (But not PROJECT.MDB)

*.DXA
*.DBF
*.FLO
*.CMD
*.STO

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Can I have multiple versions of Hydra installed on the same computer?  

Yes, you can run different versions of Hydra (6.0, 6.1, 6.2 or 6.3) on the same computer. By default, 6.0 and 6.1 are installed to the folder C:/Program Files/Pizer/Hydra and the application file is called HYDRA.EXE. Version 6.2 is installed to C:/Pizer/Hydra62 and the application file is called HYDRA62.EXE.  Version 6.3 is installed to C:/Pizer/Hydra63 and the application file is called
HYDRA63.EXE.

Each of the version series installs to the program folder a file called HydraEng.DLL, which is the hydraulic analysis engine.  You can only have one HydraEng.DLL (the hydraulic analysis engine) active at a time. Windows will automatically use the most recently installed version.  When you want to switch between different engines, you’ll need to re-register the appropriate engine with Windows.  You can tell which engine is being used by looking in the Help / About box in the interface.

NOTE:  Because of changes in default analysis settings, internal results storage, and other changes between version series, it is best to use the appropriate interface with the analysis engine.  For example, if you want to run a hydraulic analysis using Hydra 6.1, open your project with the Hydra 6.1 interface (HYDRA.EXE).  When you want to return to using the 6.3 engine, open your project with the Hydra 6.3 interface (HYDRA63.EXE).

You may not install different versions of Hydra on different computers if both are associated with the same license.  All versions you may have received, whether you purchased them as upgrades or received them at no extra charge, are considered one “copy” of the program under the license agreement.

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How do I use a different Hydra engine version for analysis?  

Only one hydra analysis engine (HydraEng.DLL) is registered with Windows at a time.  You can tell which hydraulic analysis engine is being used by looking in the Help / About box.

To register the HydraEng.DLL:

  1. Click on the “Start” button.
  2. Select “Run…”
  3. Type in “Regsvr32 ” and then the path to the HydraEng.DLL you want to use.  OR, click on the “Browse” button and find and select the HydraEng.DLL you want to use, then type “Regsvr32 ” in front of the path that is automatically input.
  4. Click ok.  It should say registration was successful.

If you are switching between engines very often, we can provide a special utility (Windows interface) for doing the above process.