Calculate that quantity of rainwater that will be collected in a group of shapes - "Other > Rainwater Collection"

Create the shapes

1. Create two or more shapes. For example, a rectangle and a polygon.

   To learn how to create the shapes, visit these links:

    

   Rectangle Tool—Draw a rectangle

   Circle Tool—Draw a circle

   Polygon Tool—Draw a polygon
   

    

Add the overlays to a folder

2. At the top of the Layers Panel, click on the Folder Icon displaying the tooltip: "Add Group".
   You will see the folder added to the Layers Panel.
    
3. Click and drag each shape’s row into the folder.
   The folder now holds a set of overlays, so the folder is considered a Group.

   To learn more about grouping overlays, see; Grouping markers/elements by using folders.

Configure the calculation

4. At the top of the Layers Panel, click on the Toolbox's gear and wrench icon.
   You will see a window with Core Operations and Plugin options appear.
    
5. Under the "Analysis" heading > "Other" subheading, click on the link: "Rainwater Collection".
    
6. Under the "Select Group" heading, click on the button: "Select".
    
7. Click on the group you created.
    
8. Under the "Rainfall" heading, type in the quantity of rainwater that falls on a square meter. You can click the up/down arrows to make fine adjustments.
    
9. Under the "Rainfall Unit" heading, select the unit for the quantity of rainfall that falls on a square meter. The options are:
   • Millimetres.
   • Inches.
    
10. Under the "Coefficient" heading, type in the percentage of rainwater that will be collected.
    Note: The coefficient is the ratio of rainwater that will be collected to the rain that falls. The coefficient can be affected by features of the location, such as material, slope, etc.
     
11. Under the "Output Unit" heading, select the unit for the quantity of rainfall that will be collected. The options are:
    • Liters.
    • Gallons.

Calculate the data and view the results

12. Click on the button: "Calculate".
    You will see a new page display the:

    • Area measurement of each shape.
    • Total area of all shapes.
    • Quantity of rainfall that will be collected in each shape.
    • Total quantity of rainfall that will be collected in all shapes.
     
13. In the top-right corner of the Toolbox window, click on the "X" button to close the window.