Wrightway Onsite experts are now installing rainwater collection cisterns!
We’re bringing our extensive experience installing underground concrete precast tanks to installing rain barrels, and waterwell services near you
What is a rainwater cistern?
Rainwater (or roof-catchment) cisterns collect and store rainwater for household and other uses. A system of gutters and downspouts directs the rainwater collected by the roof to the storage cistern.
Typically, we locate the water tank underground and construct it from various materials; however, we recommend precast concrete.
Why try rainwater collection?
Collecting rainwater is a good and environmentally friendly idea. It is especially beneficial in areas like Southern Vancouver Island and the Gulf Islands in British Columbia, where water is scarce.
Rainwater cisterns can supply water to households, farms, and more! Rainwater harvesting not only conserves water but also reduces your reliance on municipal water supplies. It’s a great way to contribute to environmental protection and save money.
How big is a rainwater cistern?
From 1000 liter water tanks to large 5,000 gallon water storage tanks, rainwater cisterns come in all different sizes. Which is great, since household water use varies significantly, depending on supply and usage.
- Local water utilities usually find that the average household uses 7500 gallons (28,000 L) of water each month. This is equivalent to at least 90,000 gallons per year.
- A family of four typically uses 73,000 to 110,000 gallons of water each year. This averages out to about 50 to 75 gallons per person per day.
Fun fact: One-third to one-half of the water is used for flushing toilets!
It’s best to consult a professional before choosing a water tank to meet your family’s needs.
How to Install a rainwater cistern
Proper design and construction are essential to minimize water-quality problems. Here are some questions to ask yourself before setting up a rainwater collection system.
Which roof surface and material works best for rainwater collection:
- Metal roofs are popular due to their effectiveness and affordability. Slate and tile roofs are excellent but expensive options.
- Avoid asphalt shingles and wood shakes with rough surfaces, as they can reduce water flow and harbor mold and mildew.
How to install gutters and downspouts effectively:
- Install gutters with downspouts to direct rainwater from the roof to collection points.
- Consider the roof area and local rainfall statistics when designing your system. Typically, experts recommend one downspout for every 40 feet of gutter.
How do you prevent clogs:
- Use leaf guard systems to prevent debris from clogging gutters and downspouts.
- Consider debris boxes or first flush diverters to separate leaves from rainwater before it enters the storage tank.
How will you use the system? What’s the best rainwater treatment method?
- Design systems for potable water (drinking) or non-potable (e.g., garden) use.
- Proper water treatment and filtration systems are essential if you plan to use rainwater for human consumption.
- Pick a rainwater tank approved for drinking water with a minimum capacity of 4,546 liters (1,000 gallons).
How to calculate your rainwater collection potential:
On average, each 9 square meters (about 100 square feet) of roof in the Capital Regional District (CRD) can collect 272 liters (60 gallons) of rainwater for every 25mm (one inch) of rain.
How to connect rainwater cistern to irrigation systems:
Will you be using the system for irrigation? If so a pressure pump can deliver the water on a timed system to your irrigation pipes for your watering needs.
Rainwater collection is a great environmentally friendly way to save money on your property. To ensure you’re installing the best system possible, get in touch with us here at Wrightway! Our experts are happy to help.
To learn more, check out available resources. Many grants are available for water well services near you! Contact your local government for subsidies.
RDN Rainwater Harvesting, Team WaterSmart | Get Involved RDN
Collecting rainwater helps with CRD water supply – Island Social Trends