Learning Outcomes

- Students will learn how to install rain barrels around their school or house
- Students will learn how rain barrels act as a means of diverting rain water that may lead into possible flooding

Length of Activity: 90 – 120 minutes
Grade Level: 8 – 12

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Install Rain Barrels


Step 1: Watch a Video Tutorial

Begin by watching this video tutorial on how to install rain barrels on your property:

Step 2: Locate Downspouts

  • Before you begin, identify any external downspouts on your property.
  • If you’re installing a rain barrel in your school, note that some schools have internal downspouts that run from drains on the roof, inside the building and down to the storm sewer.
  • Other schools also have external downspouts that run from the rain gutter down the outside of the building and into the storm sewer. Find out if your school has external downspouts.

Step 3: Calculate the Roof Surface

  • To find out how much rain water you can collect and the size of the rain barrel you need, you will have to find out the surface area of your roof.
  • Use our rain water calculator below to find out your roof surface area.




    Water Diverted (litres)

  • Remember to take into consideration the total number of downspouts there are on your property, and how much of that water is flowing to the one that you are disconnecting.

    Example: Roof size: 4 m x 10 m = 40 m²
    40 m² x 20 mms of rain = 800 litres of water

Step 4: Sketch Your Planned Project

Before starting to build your project, grab a piece of paper and write down your action plan.

  • Draw a sketch of the entire project – the number of barrels you will install by the downspout.
  • Include the base in your sketch on which the barrels will sit and indicate the measurement of the base.
  • Identify all part of the barrels and the downspout connectors.
  • Write down all the materials and the tools you will need.
  • Once you have a sketch ready, together with the notes, present the idea to the appropriate person required to give approvals of the project. Ensure that the proper health and safety measures are put in place before implementing the plan. Put a budget together and identify where funds will come from.

Step 5: Get Your Materials and Tools

  • 1 - 2 paving stones 24 x 24 inches for a level and sturdy base
  • 2 - 4 cinder blocks to raise the rain barrel above ground level to allow for gravity drainage
  • 1 - 3 bags of fine gravel as a base to level ground for paving stones
  • Screen to cover the rain barrel: once the job is complete, cover the opening of the rain barrel, you can use any waterproof material like a plastic sheet or a tarp.


  • Rakes
  • Shovels
  • Gloves
  • Screw gun
  • Metal cutters
  • Level 2 ft or 4 ft (to ensure the base is level when placing the paving stones and cinder blocks)
  • Old hose piece to connect two rain barrels, in case you are using more than 1 rain barrel
  • Hose connector kit from home hardware stores to connect two or more barrels

Step 6: Set-up Rain Barrels by the Downspout

With your sketch in hand, grab your materials and tools and get to work!

  1. Locate where the rain barrels’ base or “footprint” will be. Ensure that the footprint is aligned to the downspout you are connecting to.
  2. Level the area by clearing the vegetation, turf, roots and stones. Add a layer (1 - 5 cms) of crushed gravel to ensure the footing area is compacted. Then use a level to ensure that base is not on an angle. This will give you a durable and stable base on which to put the rain barrel. This is an important step because a rain barrel filled with water is very heavy and needs to be level and stable.
  3. Now you have a level area with a fine crushed gravel base to place the paving stones and the cinderblocks on. You want to raise the height 30 cms to allow for gravity to drain the rain barrel. You can “sandwich” the cinder blocks between two paving stones to create a stable and elevated platform. If you are considering smaller elevations of 12 to 24 cms use two to four paving stones placed on top of each other.
  4. Arrange the empty rain barrels in place and assembled as per the instructions. You now know at what height that you need to drill a hole in the downspout at.
  5. Follow the instructions on the downspout diversion kit (is there a link for this) and use the tools in the kit to drill a hole in the downspout and connect the pipe in the kit to the rain barrel.

Step 7: Identify the Location of the Overflow

If a rain barrel has not been emptied before a rainfall, or if the rainfall exceeds the storage capacity of the rain barrel, there will be overflow. The rain barrel overflow needs to be directed to a safe location at least 3 meters from the building foundations, where it can safely drain. Overflows can be directed to a rain garden or a French drain by pipe and/or swale. Some key factors to consider for the overflow:

  1. What is the soil drainage capacity? To find out, dig down and take a soil sample. Is it clay or sandy soil? The more sandy soil is, the better, and the faster the drainage will be, or the smaller the drainage area will need to be.
  2. How deep and how wide and long will the drainage area need to be?
  3. What type of gravel or stone will you use to fill the hole?
  4. What will the exposed surface be covered with: riverstone, gravel, sand and or turf?
  5. Note: In some cases, rain barrel overflow can be directed safely away from the building, without building a drainage area, if the soil drainage is good and the slope runs away from the building foundation.

Step 8: Rain Barrel Maintenance

Inspect periodically for leaks, especially spigots and other connection points. Make sure debris does not clog the system. Screen all vents to prevent mosquito breeding. For maximum stormwater benefits, empty the barrel between rain events in the wet season. Before the first sub zero winter day empty rain barrel and store safely.

Need Extra Support?

There are a number of ways that you can gather additional support or find free options to do this project. Here are a few recommendations:

  • If you’re doing the project in your school, you can approach your maintenance or facilities staff for tools and resources they already have. Not only will they have lots of great advice they may have the materials and tools that you will need.
  • If you’re doing the project at home, you can approach your parents and community for donations of plants, soil, compost or materials.
  • Contact local business for donations of materials that you will need.
  • Contact other local organizations or groups like conservation authorities, environmental groups, and your municipality for support.
  • Hold a native plan sale with plant donations from the community or an outdoor BBQ to raise funds for your efforts.
  • Create a fun work day and recruit parents for help installing and supporting the effort.

Extra Resources