# Frequent question: How many gallons of water is needed for rain?

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One inch of rain falling on 1 acre of ground is equal to about 27,154 gallons and weighs about 113 tons.

## How much rain does it take to fill a 50 gallon rain barrel?

It’s common for about 1/8″ inch of rain to fall each hour during a moderate rainstorm. That means that a 500 square foot roof can fill a properly installed 50-gallon rain barrel in about one hour.

## How much rain does it take to fill a rainwater tank?

An average 4 bedroom house has a roof surface area of approx. 200 square metres. So, if you have an average 3 bedroom house and a 3000L tank, it would take 20mm of rain to fill your tank. On average each of us uses 147 litres of water per day.

## How many gallons of rain does my roof need?

To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. For example, on a 2,000 square foot roof, you can collect 2,000 x 0.56 = 1,120 gallons/inch of rain.

## How many gallons are in an inch of rain per square foot?

Every square foot of roof space collects . 6 gallons of water in a 1 inch rainfall.

## Do you need a pump for a rain barrel?

Water Pressure: Without a Pump, It’s All about Gravity

This means the level of the water inside of your barrel has to be 2.31 feet above the irrigation system which it supplies to generate just 1 PSI. Typical household pressure ranges from 40-50 PSI. Most moderate flow garden watering systems need at least 10 PSI.

## How quickly does a 55 gallon rain barrel fill up?

It takes only 0.3 inches of rainfall to fill one, 55 gal barrel off of 300 sq ft of roof!

## How do I calculate how much rain water I will collect?

Simple Rainwater Harvesting Formula – For every 1” of rain and 1,000 square feet of impermeable surface (roof, driveway, etc), about 620 gallons are generated. Meaning, you can capture about . 62 gallons per sq ft. To figure out the square footage of a surface, multiply the width x length.

## How large should my rainwater tank be?

As a general rule of thumb, each square metre of roof space collects around 1 litre of water for every 1 millimetre of rainfall received. Using the calculation of (x) square metres of roof space available for connection to your tank multiplied by the amount of rainfall will help guide your decision.

## How do you calculate rainwater?

For calculation we take the following formula: mean annual rainfall in mm x area in m² x runoff factor = collected rainwater in litres. In our example this means: 450 x 120 x 0.9 = 48 600 litres.

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## Can you drink rain water?

It is possible, therefore, for us to drink untreated rainwater. This is because rainwater is pure, distilled water evaporated from the sun – nothing else. … This water (groundwater) is relatively safe for drinking. However, rainwater that falls to the ground does not just get absorbed into the soil – it goes everywhere.

## How many gallons is 600 square feet?

Multiply the cubic feet by the amount of water per cubic foot, which is 7.48 gallons. In this example, you would multiply 7.48 times 600 to get 4,488 gallons of water.

## How much water can I collect from my roof?

An average suburban roof of 200m2 with such a rain fall can potentially harvest 100,000L of rainwater (200m2 * 500mm = 100,000L). Keep in mind most rain falls over 2-3 months of a year. It isn’t uncommon for an area to collect up to 350mm+ of rain in just one month, even in rural areas.

## How much water is an inch of rain?

Rainfall amount is described as the depth of water reaching the ground, typically in inches or millimeters (25 mm equals one inch). An inch of rain is exactly that, water that is one inch deep. One inch of rainfall equals 4.7 gallons of water per square yard or 22,650 gallons of water per acre!

## How much is an inch of water in gallons?

One inch of water or rain is equivalent to 623 gallons per 1,000 square feet.

## How much water equals an inch of rain?

Volume and weight

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One inch of rain falling on 1 acre of ground is equal to about 27,154 gallons and weighs about 113 tons. An inch of snow falling evenly on 1 acre of ground is equivalent to about 2,715 gallons of water.