Part 1 – Hydraulic Structures

Overview

This tutorial outlines the process of creating hydraulic structures with rating tables and generalized culvert equations. This lesson needs a channel so please use the data from QGIS Lesson 2, 3, or 4 to run through this tutorial. Finish Lesson 2 before performing the following steps.

Required Data

The required data is in Module 1 and 2.

File	Content	Location
Lesson 1.qgz	Module 2 qgis file	Module 2 Part 1 Folder
Lesson 1.gpkg	Module 2 GeoPackage
*.tif	Elevation file	Lesson 1 Folder
*.txt	Culvert Rating Tables	Module 2 Part 1 Folder

Check these folders to ensure the data is available before starting the lesson.

Step 1: Setup the project

1. Start with the project from Lesson 2, 3, or 4 Complete.

2. If necessary, load it into QGIS.

3. Open QGIS and drag the lesson 1.qgz file into the project.

4. Save the project.

Step 2: Import data

Start by cleaning up the map space so the next layer will be easy to see.

1. Uncheck the User Left bank, Right Bank Cross section layers;

2. Uncheck the Blocked Areas;

3. Uncheck the Storm Drain User Layers;

4. Click the User Boundary Conditions Layer;

5. Drag the Hydraulic Structures onto the map space.

Note

If the image is blurry, use Firefox or open the image in a new tab.

Step 3: Format the data layers

1. Open the Attributes Table on the Hydraulic Structures Layer.

2. Select structure 130, and 131 and click Zoom map to selected rows button. This will zoom the map to these two structures.

Label the Hydraulic Structures layer.

3. Double click the Hydraulic Structures layer

4. Set the Labels like the following image.

5. This shows which culvert is being reviewed.

Change the layer Symbology

6. Change the tab to Symbology

7. Set the Symbol Layer Type to Arrow

8. Uncheck Curved Arrows

9. This shows the flow direction of each structure.

Step 4: Build the culverts into the User Layers Structure Lines

1. Use the Structure Editor to add all of the new structures.

2. Digitize all of the structures.

3. Click the Save icon to confirm complete digitizing.

Digitizing process:

• Left click the inlet node (upstream node)

• Left click the outlet node (downstream node)

• Right Click to finish the polyine.

• Click OK to finish the feature.

Step 5: Assign the structure attributes

Complete the Structure Fields

1. Load the Hydraulic Structures Attribute table. The attributes will help fill out each structure table.

2. Check the center button.

3. Select the first structure.

4. Rename the Structure with the “A” button.

5. Fill the Type and Rating fields

6. Move to the next structure and repeat the process.

7. Schematize the structure data.

Step 6: Assign the rating tables

1. Click the Import Rating Tables button

7. Select the rating tables from the project folder.

8. Click open.

9. The data has been imported. If the table is not updated, switch to a different structure in the widget.

Step 7: Schematize the data

1. Schematize the structure data and click Yes to replace the data.

Step 8: Save, export, and run

1. This is a good point to save project. Refer to Step 9 in Lesson 1.

2. Export the data files to the Project Folder in QGIS Lesson 6 Export.

3. All GDS data files will be created in the selected project folder.

4. The swmm.inp file was not exported. Copy it from Lesson 3 Export folder or export it again using the Storm Drain Editor.

5. Click the Run FLO-2D Icon.

6. Set the Project path and the FLO-2D Engine Path and click OK to start the simulation.