Usage

Attention

Before starting data download, it is necessary to set the project to EPSG:5514
How?

Data Download Tab (Download)

First, you must select the area of interest for data download
- To download data within the current map view, select Compute inside window extent
- To download data inside a polygon, select Compute inside polygon
  - This action will allow you to pick a polygon from the project in the dropdown below
Next, you can choose which data to download
- To download both land use data and hydrologic soil group data, select Land Use and Soil Groups
- To download only land use data, select only Land Use
- To download only hydrologic soil group data, select only Hydrology Soil Groups
To start the download, click the Download button
To stop the download process, click the Abort button

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Intersection Tab (Intersection)

In the Select Land Use layer dropdown, choose the land use layer
- If it was successfully downloaded in the previous tab, it will be set automatically
- If you wish to use your own layer, it must contain an attribute named LandUse_code with integer values
In the Select Hydrology Soil Group layer dropdown, choose the hydrologic soil group layer
- If it was successfully downloaded in the previous tab, it will be set automatically
- If you wish to use your own layer, it must contain an attribute named HSG with integer values, where
  - 1 represents group A
  - 2 represents group B
  - 3 represents group C
  - 4 represents group D
  - 0 represents water bodies
Start the intersection by clicking the Intersect button

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CN Layer Creation Tab (CN)

In the Select Land Use and HSF Intersected layer dropdown, choose the layer resulting from the intersection of land use and hydrologic soil groups
- If it was successfully intersected in the previous tab, it will be set automatically
- If you wish to use your own layer, it must contain attributes named LandUse_code (integer) and HSG (integer)
The line below shows the path to the CSV file for CN value conversion
To choose the location of your own CSV file, click the three-dot icon next to this line
To create the CN layer, click the Create CN layer button

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Run-off Volume Calculation Tab (Run-off)

In the Select CN layer dropdown, choose the CN layer
- If it was successfully created in the previous tab, it will be set automatically
- If you wish to use your own layer, it must contain an attribute named CN2 with decimal values
  - It may also contain an optional attribute named CN3 with decimal values
In the Initial Abstraction Coefficient field below, you can enter a custom initial loss ratio coefficient
- This can be chosen in the range 0.1 – 0.3
If you wish to calculate run-off volumes using design rainfall depths from the rain.fsv.cvut.cz service for various return periods, select Use rainfall depth from rain.fsv.cvut.cz
- Then choose the desired return periods via the checkboxes in the Select Recurrence Intervals section above
If you wish to calculate run-off volumes using your own design rainfall depths, select Define your own rainfall depth [mm]
- Then enter the values in millimeters in the field below
  - To perform calculations for multiple depths, separate them with a semicolon ;
Start the process by clicking the Compute run-off button

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Batch Execution

Batch execution is enabled by run_batch.py located in the scripts directory. The batch job configuration is specified using a YAML configuration file. An example configuration is available in tests/batch.yaml. Example execution:

python3 scripts/run_batch.py tests/batch.yaml

For MS Windows, a batch file run_batch.bat is provided, which automatically sets up the QGIS runtime environment. Before running it, adjust the path to your QGIS installation in this file.

Using Local Data

Download LPIS and ZABAGED datasets and update the data source paths (URI) in the configuration files located in the config/local_data/ directory. Then, in the batch job settings, set local_data to True.