Meaning, you can capture about.62 gallons per sq ft. To figure out the square footage of a surface, multiply the width x length. The square footage of a roof is the same whether it is pitched or flat.
What is rooftop rainwater harvesting?
May 29, 2013 · Let’s use this as an example and assume a rooftop surface area of 150m2 and an annual average rainfall of 1000mm. If you plug these figures into the above calculator, you’ll see that you can harvest 135000 litres of rain per year, i.e. half your annual requirement.
How much potable water is saved by rooftop rainwater collection?
Apr 03, 2004 · Roof Area (ft 2) X Precipitation Amount (in) X 0.623 = Amount Collected (gallons) Easy Formula to Remember: 1″ of Rain on 1,000 sf Roof will Yield 623 Gallons Roof Area (m 2 ) X Precipitation Amount (mm) = Amount Collected (liters)
How do I calculate the amount of water collected from my roof?
For example, on a 2,000 square foot roof, you can collect 2,000 x 0.56 = 1,120 gallons/inch of rain. If your average rainfall was 25 inches/year, your annual collection potential is 1,120 x …
How much rainwater can you collect?
Dec 22, 2015 · Greentumble Green Living December 22, 2015. Rooftop rainwater harvesting has been practiced for more than 4,000 years of human history, and still remains necessary in many areas where there is no centralized water supply system or when quality surface water or groundwater is lacking [sc:1]. Rainwater collection practices are becoming ...
How much water can I harvest from my roof?
How many gallons of water does a roof collect?
What quantity of rainwater can be collected?
How do you calculate water harvesting?
How do I calculate how much water is in my roof?
- Take the dimensions of the footprint of your roof and convert them to inches. (So, a 50' x 20' roof is 600" x 240".)
- Multiply the roof dimensions by the number of inches of rainfall. (In this example, 600" x 240" x 1" = 144,000 cubic inches of water.)
How do you collect rainwater from your roof?
How many litres of water does a roof take?
How do you calculate rainwater harvesting capacity?
How much does rainwater harvesting save?
How many litres is 1mm of rain?
How will you calculate rain water harvesting potential for your house?
What is the formula of rainwater?
For example, one inch of rainfall on a roof that is 20 feet by 20 feet can provide 220 gallons of rainwater. The list below sets out the formula for calculating rainwater harvests.
Can you use rain water on a roof?
So long as your roof doesn’t contain toxins, you can safely use the water for irrigation without any treatment. Studies that have compared the quality of rainwater flowing over common roofing materials types have found that all types would require the water to be treated to meet potable water standards.
What is rain water used for?
All over the world rainwater is used for washing, cleaning, and drinking, without filters or disinfection. However, in the U.S. and Canada most potable systems do include filtration and disinfection since the water can become contaminated, for example if birds or other animals poop on the roof.
What happens when rain falls through the air?
When rain falls through polluted air, it picks up particles of soot, dust, and smoke. If the air is polluted where you live, using rainwater catchment for irrigation is of no more concern than the rain falling directly from the sky and landing on your garden; the same pollutants will end up in the garden either way.
What is roof top rainwater harvesting?
Rooftop rainwater harvesting systems are useful for augmenting the water systems in both urban and rural areas, and they are excellent for use in arid and semi-arid areas where traditional water sources are not readily available.
Is rainwater harvesting easy?
Rainwater harvesting systems are generally easy to install and operate, and local people can be trained to construct and use them. Rainwater is a convenient water source at the point of consumption and allows for full local control, even at the family level.
Is rain water good for the environment?
Rainwater has the potential to provide for a continuous water supply for those living in rural areas, as well as for the poor. Rainwater is generally considered to be suitable for domestic use. Rainwater harvesting systems have few negative environmental impacts compared to large centralized water supply projects.
What are the components of a rainwater system?
Components of a rooftop rainwater harvesting system 1 Collection (Catchment) Area: In the case of a rooftop rainwater harvesting system, the roof of a house or of another building serves as the rainwater collection area. The efficiency and the quality of the water collected depends on the effective roof area and the materials that the roof is constructed of. 2 Conveyance System: This is what connects the catchment area to a rainwater storage area. Conveyance systems typically consist of gutters or pipes that drain the water that is collected from the rooftop into cisterns or other storage containers. 3 Storage Containers: These containers are typically in the form of a storage tank or cistern, but they can also be mortar jars, made from concrete, or they can even consist of simple vessels that are placed at the edge of roofs. The storage containers can be incorporated into a building’s construction, but also can be built on site separately from the the building. Storage tanks that use gutters can be placed above or below ground.
What is roof top water harvesting?
Rainwater harvesting is a technology used to collect, convey and store rain for later use from relatively clean surfaces such as a roof, land surface or rock catchment. The water is generally stored in a rainwater tank or directed to recharge groundwater.
How long has rainwater been used?
Rainwater harvesting has been practiced for over 4,000 years throughout the world, traditionally in arid and semi-arid areas, and has provided drinking water, domestic water and water for livestock and small irrigation.
Where is rainwater collected?
Land-based rainwater harvesting occurs when runoff from land surfaces is collected in furrow dikes, ponds, tanks and reservoirs. Roof-based rainwater harvesting refers to collecting rainwater runoff from roof surfaces which usually provides a much cleaner source of water that can be also used for drinking.
Is rain water a drinking water source?
Harvested rainwater is also used in many parts of the world as a drinking water source. As rainwater is very soft there is also less consumption of washing and cleaning powder. With rainwater harvesting, the savings in potable water could amount up to 50% of the total household consumption.
Which surface receives rain directly?
The surface that receives rainfall directly is the catchment of rainwater harvesting system. It may be terrace, courtyard, or paved or unpaved open ground. The terrace may be flat RCC/stone roof or sloping roof. Therefore the catchment is the area, which actually contributes rainwater to the harvesting system.
What is the first flush?
1.4.3 FIRST FLUSH. First flush is a device used to flush off the water received in first shower. The first shower of rains needs to be flushed-off to avoid contaminating storable/rechargeable water by the probable contaminants of the atmosphere and the catchment roof.
Who is Kanwarjot Singh?
Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.
What materials are used for rainwater harvesting?
So what kinds of roofing materials do we need to watch out for when it comes to rainwater harvesting? Luckily the true black-list is short: 1 Cedar Shake: Wood shingles are almost always treated with fire retardants. This probably isn't something you want in your water. Have a sample tested to be sure. This water may be suitable for irrigation. 2 Copper: The lucky few who can afford copper roofs may already know that copper is naturally resistant to algae/moss growth because it is an herbicide. Copper will leach into your rainwater, so if using for garden irrigation, copper isn't an ideal choice. 3 Lead: Lead flashing is still available in some parts of the USA so test for lead if you're harvesting for drinking water. 4 Biocides: Some rooftops are treated with biocides. Zinc- or copper-treated shingles are common in the Pacific Northwest to curb mold, moss, and algae growth on the roof. If you're harvesting for irrigation, make sure your biocide levels are low enough not to hurt your plants.
What is the best material for collecting rainwater?
If you're installing a new roof for the purpose of collecting rainwater, standing seam metal may very well be your best choice. A high quality enameled roofing material that is easy to clean, standing seam metal offers the highest collection efficiency available.
What is the NSF?
The National Sanitation Foundation (NSF) provides a list of approved roof coatings for potable rainwater catchment systems. *All water collected for potable use (e.g. human consumption) must be treated to meet drinking water standards.
What are the components of rainwater?
COMPONENTS OF ROOFTOP RAINWATER FOR GROUNDWATER RECHARGE. 1. ROOF CATCHMENT. The roof of the house is used as the catchment for collecting the rainwater. The style, construction and material of the roof determine its suitability as a catchment.
What is the roof used for?
The roof of the house is used as the catchment for collecting the rainwater. The style, construction and material of the roof determine its suitability as a catchment. Roofs made of corrugated iron sheet, asbestos sheet, tiles or concrete can be utilized as such for harvesting rainwater.
Is rainwater harvesting a viable alternative?
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!
Why is rain water better for plants?
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.
Is rain water a good source of water?
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.
What is rainwater collection?
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.
What is a rain barrel?
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.