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**Use the basic WHIST example set up (= WHIST Course model) to get familiar with the tools listed here beneath.**
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- **E1-E9 are exercises to learn how to use different tools and export new data.**
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- **E10 A and B are exercises to learn how the subbasin changes affect the different HYPE files in your corresponding HYPE course model, e.g. a split of a subbasin will cause a "chain reaction" that has to be solved before the model will run properly again.**
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___
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[[_TOC_]]
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____
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### E.0 Start WHIST and learn the basics to get started
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Start WHIST, see **[3.3 Test to run WHIST](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-3.-Download-software-and-get-started#33-test-to-run-whist)**
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Learn how to zoom out, zoom in and move around in the map, see **[5. Navigation](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-5.-Navigation)**
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Learn how to view the data, subbasins, flowlines, topograpy, external shapefile, Open Street Map, see **[6. View tools](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-6.-View-tools)**
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Learn how to select subbasins, see **[7. Select subbasins](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-9.-Select-subbasins)**
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### E.1 Load and save subbasins
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See **[8. Load and save WHIST work](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-8.-Load-and-save-WHIST-work)**
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### E.2 Rerout / relink subbasins
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The topography used may not always be totally correct in a hydrological point of view.Sinks may appear or a river is connected in a wrong direction. This is more common in very flat area where the real watersheds are difficult to define. If you have the river network, as you know it, described in a shapefile, you can view this shapefile in the background, see **[6. View tools](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-6.-View-tools#65-viewing-external-data-like-open-street-map-osm-or-shapefiles-with-reference-data)** and then relink the subbasins that you find are routed in a wrong way according to 10.3 and 10.3.1 **[Routing adjustments](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/10.-Editing-tools#103-routinglinking-adjustments-edit-2)**.
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After edits these steps should always be done before saving the entire work:
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- Select all basins
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- Clean Hydro Connections
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- Set HAROID
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![Finishing](uploads/3e838d8c49db7c381678088a73894811/Finishing.png)
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*Figure E2. Routine to do after any subbasin revision before saving the work*
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### E.3 Cut and Split subbasins
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If you want to cut a subbasin without taking the topography into account you can use the "cut" tool, see **[10.2.1 Cut](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/10.-Editing-tools#1021-cut-manual)**
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If you want to split a basin with help from the topography, use the **[10.2.2 Split tool](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/10.-Editing-tools#1022-split-according-to-flow-accumulation-grid)**
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If you would like to split a subbasins at a specific location you might be helped by viewing a shapefile showing that location or the Open Street Map. You can view these in the background, see **[View shapefile or Open Street Map](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-6.-View-tools#65-viewing-external-data-like-open-street-map-osm)**
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As after all kinds of revisions you should end this procedure with:
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- Select all basins
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- Clean Hydro Connections
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- Set HAROID
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before you are saving the work (see figure E2 above)
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When cutting or merging subbasins you also have to follow the instructions under E.7 to get the elevations and slc classes correct for the revised subbasins.
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### E.4 Merge subbasins
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If you would like to merge 2 or several subbasins there are a several different tools to use depending on the task, from just merging two subbasins into one, to more automatic merging of certain types of subbasins, e.g small subbasins, coastal subbasins etc. These more automatic tools were developed to for post-processing/cleaning of very large models. They should be used with caution and you should check the results thoroughly before you accept/save the changes.
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See **[10.4 Merge tools](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/10.-Editing-tools#104-merging-tools-with-different-criterias-merge)**
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As after all kinds of revisions you should end this procedure with:
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- Select all basins
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- Clean Hydro Connections
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- Set HAROID
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(see figure E2 above)
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When cutting or merging subbasins you also have to follow the instructions under E.7 to get the elevations and slc classes correct for the revised subbasins.
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### E.5 Remove and add subbasins
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If there is an area that you are not satisfied with, it might have too large subbasins, be too postprocessed due to large lakes, floodplains, non contributing areas, etc, you can delete this area and delineate new subbasins from scratch by using the already given topography database in the WHIST set up.
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- Start by select the basins you would like to remove. After this click on the the "Edit 1/ kill" button, see **[Kill - delete subbasins](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/10.-Editing-tools#1027-kill-delete-subbasins)**.
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- Then go to HYDRO/create and then follow the instructions **[Create subbasins from hydrologically corrected topography data](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/Create-subbasins-from-hydrologically-corrected-topography-data-(DEM,-DIR,-ACC)#c-1-delineate-new-subbasins-using-the-given-topography-data)**
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When you have covered the deleted area with new subbasins you must end the with:
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- Select all basins
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- Clean Hydro Connections
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- Set HAROID
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(see figure E2 above)
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After that you can recalculate the ELEV_MEAN, ELEV_STD and SLC (+ DHSLC) again according to E.7 here beneath.
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Export the new shapefiles and the new HYSS file according to **[12. Export shapefiles and tables](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/12.-Export-shapefiles-and-tables)**
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Before you have a useful HYPE model you must link discharge time series, LakeData olakes, forcing data time series etc, to the correct subbasins (SUBID) in GeoData.txt
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### E.6 Import your own subbasins
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You can use your own subbasins for setting up HYPE and extract the data you wish. If you do not have the routing (it must be described in the same way as in a typical GeoData.txt with a MAINDOWN column in the attribute file) you then use a topography database (with hydrologically conditioned DEM, DIR, ACC) to determine the routing. The shapefile must have the same coordinate system as the WHIST database.
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- Go to HYDRO/import.
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![01Import](uploads/9e39cee73ff5830ea324afe9668fa496/01Import.png)
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- use "replace all previous subbasins"
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- Check that the correct database of topography is used.
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- browse for your *shapefile* under Input file/folder
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- Choose the column for the subbasin ID´s (here SUBID)
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- Choose (if available) the column for the next downstream subbasin (here MAINDOWN).
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- Decide upon the different options about overlaps/sea target/duplicate IDs.
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- Choose pourpoint generation method (Choose max flow to use the topography information)
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- Click on Import
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![Import_basins](uploads/5e1c454306f95bfa055771cc03e04ab9/Import_basins.png)
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If you do NOT have any routing described it should have been set during the import since "max flow accumulation" was checked. If this is not the case, select all subbasin and use the tool under [HYDRO /Edit 2/Manage links and coords/](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/10.-Editing-tools#1032-manage-links-routing-and-coordinates-pour-target-center-points). Use this tool twice. Then you can be sure that the pour points also are correct (according to grid). After that you should repeat the standard procedure:
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- Select all basins
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- Clean Hydro Connections
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- Set HAROID
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(see figure E2 above)
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Check the results and post process the files according to the following instructions here beneath.
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### E.7 Add spatial data to subbasin
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A general description is provided here: **[11. Extract and connect attribute to the subbasins](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/11.-Extract-and-connect-attributes-to-the-subbasins)**.
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If you just want to update the data connections (ELEV_MEAN, ELEV_STD, SLC- and DHSLC classes) already used in the course model due to subbasin changes you can follow this:
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- Go to Manage Data connection
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![ManageDataCon2](uploads/a9d3e1a84eb30b1f5c6851b3b295a58a/ManageDataCon2.png)
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Select ELEV_MEAN in the "Existing list" to the right. Check that the grid "DEM" is marked and mean is choosen as method. Click on the replace button to be sure this is correct from now on.
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![Dataconn1](uploads/f4c65455a0fa70e2fc5c55166ec5a9f0/Dataconn1.png)
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Do the same for ELEV_STD but with STDEV as method instead.
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![Dataconn2](uploads/6147b027561c3fc4b02c7853d384e20b/Dataconn2.png)
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And at last the SLC and DHSLC. Mark SLC to the right. Check that E_SLC grid is marked, click the Replace button, answer yes to the "DH" question and Choose dem.hgt as the elevation grid.
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![Dataconn3](uploads/3ae91a7989b4e55de31dedc5b597bb54/Dataconn3.png)
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After this Click OK.
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Select all subbasins
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Click on the dialog for connected fields button. Check the items you want to calculate choose your options and then OK.
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![Manage_Data_fields](uploads/eed267fc120850285fec2828a2793f87/Manage_Data_fields.png)
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The data is now calculated. If you have a large model it might take a long time. When ready, save and export your new results according to the instructions here beneath.
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### E.8 Export subbasins and their attributes
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You can find information about the available type of exports here: **[12. Export shapefiles and tables](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/12.-Export-shapefiles-and-tables)**.
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The text file received using the "HYSS" export is the table that can be used as a base for the GeoData file in HYPE.
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:bell: **The text file provide the same information as the shapefile attribute file but with one more decimal for the SLC classes etc. It can also provide more columns than a shapefile attribute file. It is more reliable to use the exported HYSS text file than the attribute file of the shapefile for the GeoData file.**
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### E.9 Change topography database and create your own subbasins
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WHIST is sensitive to the formats as you can read in the chapter about **[WHIST requirements](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-2.-WHIST-requirements**) but as long as these are followed it is possible to change to any database containing grids of DEM, DIR, ACC/UPA as a minimum. Please follow the instructions in **[chapter 4](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/-4.-How-to-change-projection-(i.e-use-another-topography-database)-of-your-WHIST-set-up)**. When the new database is added and you are able to view the grids in the WHIST interface you are ready to create a method for subbasin creation. Please follow the instructions in the chapter **["Create subbasins from hydrologically corrected topography data (DEM, DIR, ACC)"](https://git.smhi.se/whist/whist/-/wikis/WHIST-Wiki/Create-subbasins-from-hydrologically-corrected-topography-data-(DEM,-DIR,-ACC))**.
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