20 Strategies and Tips for Creating a Rainwater Catchment System

20 Strategies and Tips for Creating a Rainwater Catchment System | rain-water | Preparedness\Survival

Living in the desert has taught me not to take water for granted.  Unlike the Pacific Northwest, I am not footsteps away from streams, ponds, or a vast sea just waiting for me to collect and purify for personal use.

In a continuing effort to educate our readers on the finer aspects of self-sufficiency, I have invited Dan Chiras to share his best strategies and tips for creating a rain catchment system that works.

If Dan’s name sounds familiar, it is because he is the author of two Prepper Book Festival titles, Survive in Style: The Prepper’s Guide to Living Comfortably through Disasters and Power From the Sun: A Practical Guide to Solar Electricity.  Today he is here with specifics on collecting rainwater, regardless of where you live.

Let it Rain: Collecting Rainwater from Your Roof to Survive in Style

In a crisis, rainwater can become one of a prepper’s greatest allies. If you live in an area with as few as 30 inches (12 cm) of precipitation a year, you may be able to live entirely off water falling on the roof of your home. That is, you could collect enough water from precipitation to meet all of your needs for cooking, cleaning, bathing, flushing toilets, watering gardens, and supplying a few chickens and a goat or cow – if you use water efficiently. I’ve done it for many years.

In drier climates, you may not be able to live off rainwater, but you could capture enough water to irrigate a vegetable garden and fruit trees and perhaps supply a few animals that provide the food you’ll need to survive in style.

Rainwater catchment systems are about as simple as they come. All you’ll need is a roof, gutters and downspouts, several rain barrels or a large tank (cistern), and water filters and purifiers. Chances are you are already well on their way to having a successful rainwater catchment system.

If your house is equipped with gutters and downspouts and you’ve got a water filter like an MSR Miniworks EX Microfilter and water purification device like a SteriPen, all you’ll need to do is to add a few rain barrels or a cistern connected to several downspouts to start collecting rain water right now.

I lived off-grid for 14 years in Colorado in the Foothills of the Rockies and supplied all of my family’s water with a rainwater catchment system during that time, although we used water very efficiently. I was constantly amazed by the amount of water we were able to collect off our roof. You will, too.

20 Strategies and Tips for Creating a Rainwater Catchment System | 2500-gallon-plastic-tank | Preparedness\Survival
This 2500 gallon plastic tank was installed to catch rainwater off our roof.

How Much Rainwater Can I Collect?

To estimate the amount of rainwater you can capture from a rooftop, simply multiply the square footage of your home by the amount of precipitation in inches by 0.55. (IF your home is two stories, divide the total square footage by the number of stories.)

A 2,000 square foot (190 square meter) home in the Midwest in an area that experiences 30 inches of annual precipitation could capture 33,000 gallons (125,000 liters) of water per year. That’s about 90 gallons (230 liters) of water per day.

In most conventional homes, that’s only enough water for one person. If used judiciously, however, that 90 gallons (230 liters) per day could meet all of your and your family’s needs. (Judiciously is another way of saying you will need to use water very efficiently.)

How to Create a Water Catchment System from Rainwater

Here are some tips to create a successful rainwater catchment system.

1.  Check with local authorities to be sure that rainwater catchment systems are legal in your state.

Some western states like Colorado prohibit rainwater collection, although I’ve known a few rebellious individuals who have installed them anyway, flying successfully under the radar. I can’t recommend that strategy, for legal reasons, but doubt anyone’s going to care if they’re capturing rainwater to survive. Even in “normal” times, illegal rainwater catchment is not a high-priority crime.

2.  Remember, you can collect rainwater off your home, but also off roofs of other buildings such as garages, carports, sheds, and chicken coops.

Doing so will greatly increase your supply of water.

3.  The cleaner the roof the better. Metal and tile roofs produce cleaner water than asphalt shingle roofs.

The cleaner the water, the less filtering and purification you’ll need to render the water drinkable. Bear in mind, however, if you’re going to simply use rainwater to irrigate gardens, fruit trees, and berry patches or supply a few chickens and a cow or goat, the water won’t need to be as clean up front.

4.   If your home is surrounded by deciduous trees, install leaf guards on your gutters.

At the very least, install a leaf screen on your downspout. Leaves clog up gutters, but more important, decaying leaves in gutters produce organic compounds that contaminate water supplies. They probably won’t kill you, but they may turn the water brown.

5.  For best results, install a roof washer.

This is a rather simple device that diverts a small amount of water initially flowing off a roof during a rainstorm away from your cistern or rain barrel. This, in turn, prevents dirt and bird droppings, if any, from contaminating your drinking water supply. (See the website I cited below to learn more about roof washers.)

6.  If you live in a warm climate, rain barrels and cisterns can be installed above ground.

Be sure to install tanks with opaque walls (not clear or translucent). If possible, install them in shady locations to keep the water cooler and protect the tank from UV radiation. Tanks with transparent or translucent walls allow sunlight to penetrate. Sunlight, in turn, supports algae that will contaminate your water.

7.  If you live in a colder climate and want to collect water from snow melting off your roof, be sure to bury your cistern below the frost line or place it indoors – for example, in a basement.

Only bury water tanks rated for underground burial.

8.  If you are planning on drinking water from your system, it’s a good idea to install a tank rated for potable water, although a high-quality filter that removes organic chemicals may be all you need.

If you are going to be using the water for cleaning, watering plants, and supplying animals, a clean plastic tank will generally suffice.

9. If you purchase used tanks, be sure they have never been used to store toxic chemicals such as herbicides or insecticides or natural oils like Vitamin E.

The latter are very difficult to clean initially.

10. Rainwater can be emptied directly into open barrels from gutters cut off just above the rain barrel or can be filled by rainwater diverters that are installed in gutters.

20 Strategies and Tips for Creating a Rainwater Catchment System | simple-two-tub-system-collects-rainwater | Preparedness\Survival
It ain’t pretty but this simple two-tub system collects rainwater off one of our outbuildings to help water our cattle.

11.  Be sure to place a fine-mesh screen over open rain barrels to keep mosquitos and other critters out.

They’ll lay eggs in standing water. Mosquitos are also potential carriers of some microorganisms that result in fatal diseases such as malaria, in tropical and semitropical climates. They’re also known to spread the West Nile virus in temperate climates. Lest we forget, they’re also a nuisance for those who like to sit outdoors at night. A screened top will also prevent birds and mice from gaining access and drowning, then rotting, in your water supply.

12. Place rain barrels on cement blocks and install a spigot so you can easily remove water from the tank with a garden hose or bucket.

20 Strategies and Tips for Creating a Rainwater Catchment System | Rain-barrel-with-spigot-e1491005696397 | Preparedness\Survival
You definitely will want to install a spigot on your rain barrel.

13.  Remember, two or more rain barrels can be daisy chained (plumbed) together to increase the amount of water you collect.

14.  If you install an underground cistern or an aboveground barrel or tank, be sure to equip it with an overflow – a safe outlet that will carry excess water away from the tank should it top off in a rainstorm.

Be sure the drains at least six to 10 feet away from your foundation.

15.  If you draw water out of a cistern with an electric pump, be sure the inlet to the pump is six inches or so off the bottom of the tank so it won’t suck up any sediment.

16.  Drain rain barrels and cisterns every year or two and clean them to remove sediment or organic residues that may have collected on the bottom of the tank or organic matter such as algae attached to the walls.

17.  Purify water intended for human consumption – for example, water in which you cook food or water you drink.

Because rainwater collected off most roofs tends to be pretty clear (free of sediment or suspended solids), you may not need to filter it or it’ll require very little filtering. Do purify all potable water to eliminate potential parasites and microbes.

18. After you have set up your rainwater catchment system, have the water tested for a wide range of contaminants, especially if you live in or near a polluted city.

19.  Purchase filters and purifiers, then try them out.

Have the water tested again to determine how clean the water is.

20.  Start learning many ways to use water more efficiently.

You can learn about them in my new book, Survive in Style: How to Live Comfortably through Disasters.

Additional Resources

To learn more about roof washers and system design visit http://extension.psu.edu/natural-resources/water/drinking-water/cisterns-and-springs/rainwater-cisterns-design-construction-and-water-treatment.

To obtain information on cisterns for personal water collection visit http://www.rainharvest.com/rain-harvesting.html.

The Final Word

Rainwater catchment systems are perfect for those who want to stay put or for those who have a safe place to escape to in times of crisis but lack a water supply. Although you may have to use water very efficiently, for instance, by taking shorter and less frequent showers, you’ll be much better off if a short-term disaster morphs into a year-long nightmare than those who have simply stockpiled water. You can even use a rainwater catchment system in times of relative calm to reduce your dependence on well water or municipal water supplies.

Get going now and set up a system as soon as you can. This will give you time to learn how much water you can collect and how the system works. It will also give you time to work out any bugs. You’ll never regret this decision.

Enjoy your next adventure through common sense and thoughtful preparation!



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About The Author

Gaye Levy, also known as the Survival Woman, grew up and attended school in the Greater Seattle area. After spending many years as an executive in the software industry, she started a specialized accounting practice offering contract CFO work to emerging high tech and service industries. She has now abandoned city life and has moved to a serenely beautiful rural area on an island in NW Washington State. She lives and teaches the principles of a sustainable and self-reliant lifestyle through her website at BackdoorSurvival.com. At Backdoor Survival, Gaye speaks her mind and delivers her message of prepping with optimism and grace, regardless of the uncertain times and mayhem swirling around us.

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