Can we collect rainwater and use it later?

watercache.com - Rainwater Harvesting 101 | Your How-To Collect Rainwater Guide

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What is Rainwater Harvesting?

Rainwater harvesting is collecting the run-off from a structure or other impervious surface in order to store it for later use. Traditionally, this involves harvesting the rain from a roof. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater collection systems can be as simple as collecting rain in a rain barrel or as elaborate as harvesting rainwater into large cisterns to supply your entire household demand. The idea of rainwater harvesting usually conjures up images of an old farm cistern or thoughts of developing countries. The reality is that rainwater harvesting is becoming a viable alternative for supplying our households and businesses with water. It’s not just for the farm anymore! There are many countries such as Germany and Australia where rainwater harvesting is a norm. Due to the green building movement, you will be seeing rainwater harvesting systems become more popular here in America. The collection of rainwater is known by many names throughout the world. It ranges from rainwater collection to rainwater harvesting to rainwater catchment. In addition, terms such as roofwater collection or rooftop water collection is also used in other countries. We believe that rainwater harvesting is a viable technology in an urban setting. All that is necessary to take advantage of this resource is to capture the free water falling on your roof and direct it to a rainwater storage tank. By doing this, you can take control of your water supply and replace all or at least a substantial portion of your water needs. Rainwater harvesting systems can be configured to supply your whole house and/or your landscape needs.

What are the Benefits of Rainwater Collection?

Rainwater is a relatively clean and absolutely free source of water

You have total control over your water supply (ideal for cities with water restrictions)

It is socially acceptable and environmentally responsible

It promotes self-sufficiency and helps conserve water

Rainwater is better for landscape plants and gardens because it is not chlorinated

It reduces stormwater runoff from homes and businesses

It can solve the drainage problems on your property while providing you with free water

It uses simple technologies that are inexpensive and easy to maintain

It can be used as a main source of water or as a back up source to wells and municipal water The system can be easily retrofitted to an existing structure or built during new home construction System are very flexible and can be modular in nature, allowing expansion, reconfiguration, or relocation, if neccesary It can provide an excellent back-up source of water for emergencies Not enough benefits for you? Discover more rainwater harvesting advantages.

Why is Rainwater Harvesting Important?

Rainwater harvesting is important for several reasons but one of the biggest is the fact that we are tapping out water conservation gains inside our homes so we need to start looking outdoors for more opportunities. The following graph shows the gains that have been achieved with our indoor water fixtures through the combination of governmental standards and innovation by fixture companies. As you can see, we don’t have much more room to go in terms of achieving more efficiency gains with our indoor fixtures. What’s next… the 0.2 gallon per flush toilet? Probably not! This phenomenom is known as the law of diminishing returns. So where will the next revolution in water conservation take place? We believe we offer services in the areas where this revolution will take place.

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What are the uses of collected rainwater?

You can essentially use rainwater anywhere you use tap water. The idea of using drinking water to flush our toilets and water our lawns is wasteful and irresponsible, especially in light of population growth and water shortages across the country. Rainwater collection is a technique to green your home and to lessen your environmental footprint. There are basically three areas where rainwater can be used: Irrigation use

Indoor, non-potable use

Whole house, potable use Here are some ideas for specific uses of rainwater: Hand water your lawn and garden

Connect rainwater collection system to irrigation/sprinkler system

Wash your vehicles

Wash your pets

Refill your fountains and fish ponds

Refill your swimming pool

Replace the use of tap water with rainwater to wash your driveways and sidewalks (if you don’t use a broom)

Use it for all indoor non-potable fixtures (toilets and clothes washer)

Use it for all potable needs when properly filtered and disinfected

Use it for industrial processes instead of municipally treated water

So just how much rain can I collect?

The amount of rainfall that you can collect is governed by the following formula: 1″ of rain x 1 sq. ft. = 0.623 gallons Easy to Remember Formula: 1″ of rainfall over 1,000 sf will yield 623 gallons To calculate the amount of rainwater you can collect, you need to know your annual average precipitation for your area. You can use the precipitation map below to find an approximate amount for your area. Alternatively, you can find an exact precipitation amount by looking at the NCDC Monthly Precipitation Probabilities and Quintiles. Find the closest weather station to you and use the 0.5 row to determine your annual average precipitation. Once you have the annual average rainfall in your area and the square footage of your collection surface, you can plug these values into our rainwater collection calculator below.

Enter Your Roof Area *

Enter the Total Annual Rainfall For Your Area * Look up your area's average annual rainfall totals here . For central Texas, the average annual rainfall is 32 inches.

Total Rainwater Collection Potential (gallons): Δ

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How to harvest rainwater

So you’re convinced that you want to start collecting rainwater at your house. Below you will find the resources to educate yourself on the best method for harvesting rainwater in your situation. You will also find information about the basic components of a rainwater collection system. Even though rainwater catchment is an old technology, there have been many improvements over time through product innovations.

What are the different methods to collect rainwater?

The only thing that differs in the following methods is the scale of the system. They all follow the same principles but differ on aesthetics and actual water conservation effectiveness. Click the pictures for a closer look. Rain barrels can get you started Rain Barrels This method is the most common and one that many people are familiar with. This involves installing a barrel at a gutter downspout to collect rainwater. The actual barrel may be a recycled barrel or a new commercially available rain barrel.

Pros: Easily implemented by anyone at any residence

Barrels are readily available in your community or at various stores & websites Barrels don’t take up much space so they can fit into any situation Cons: Capacity is generally only 50 to 100 gallons

Easily overflows and wastes collection opportunities

Moving up in the world... “Dry” System This method is a variation of a rain barrel set-up, but it involves a larger storage volume. Essentially, the collection pipe “drys” after each rain event since it empties directly into the top of the tank.

Pros: Can store a large amount of rainwater

Great for climates where rainfall happens with infrequent, larger storm events

Can be inexpensive to implement

Less complicated system so maintenance is easier Cons: The storage tank must be located next to your house Now you are talking! “Wet” System This method involves locating the collection pipes underground in order to connect multiple downspouts from different gutters. The rainwater will fill the underground piping and the water will rise in the vertical pipes until it spills into the tank. The downspouts and underground collection piping must have water-tight connections. The elevation of the tank inlet must be below the lowest gutter on the house.

Pros: The ability to collect from your entire collection surface

The ability to collect from multiple gutters and downspouts

The tank can be located away from your house Cons: More expensive to implement due to underground piping

Sufficient difference between gutters and tank inlet must be available

watercache.com - Rainwater Harvesting 101 | Your How-To Collect Rainwater Guide

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