What is water harvesting and its basic calculation?

What is water harvesting and its basic calculation?

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 do you calculate flow of rainwater?

Storm water Discharge calculations: Using Rational formula i.e. Q=CIA Where Q – is design peak runoff rate m3/hr. I – Rainfall Intensity value in mm/hr. A – Catchment area in Ha.

How do you calculate rainwater runoff?

To calculate the runoff from any given rainfall:

1. Take the dimensions of the footprint of your roof and convert them to inches. (So, a 50′ x 20′ roof is 600″ x 240″.)
2. 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.)

What is the formula of rainwater?

Formula: Area (Length x Width) x Rainfall A typical roof area can provide surprising amounts of water. For example, one inch of rainfall on a roof that is 20 feet by 20 feet can provide 220 gallons of rainwater.

How many litres is 1mm of rain?

With a rainfall of 1 mm, every square metre receives 1 litre of rain water. A rainfall of 1 mm supplies 0.001 m3, or 1 litre of water to each square metre of the field. Thus 1 ha receives 10 000 litres.

How do you calculate rain per square foot?

So all you need to do is some simple math. Determine the square footage of the area that’s connected to your rain barrel and multiply it by 0.6, ( sq. feet x 0.6 = gallons). How much rain you can collect off your roof is determined by how large your system is and how much rainfall you have in your area.

What is the chemical formula of rainwater?

The average ratio of (NO(3) + Cl)/SO(4) observed as 1.1 indicates that nitric and hydrochloric acid influences the acidity of rainwater. The ratio of NH(4)/NO(3) and NH(4)/SO(4) was observed as 0.68 and 0.34 indicate that the possible compounds which may predominate in the atmosphere are NH(4)NO(3) and (NH(4))(2)SO(4).

How do you calculate rainfall per area?

Find the average volume of rain = Depth x radius x radius x 3.14. Find the area at the top of the bucket (this is the area over which the rain is collected). Divide the rainfall volume by this area to get the rainfall.

How is rainwater downpipe calculated?

To calculate the minimum number of downpipes, divide the roof catchment area by the allowable maximum catchment per downpipe. To calculate the average catchment per downpipe, divide the roof catchment area by the number of downpipes.

What is 1cm rain?

1 cm of rainfall means that a volume of water equal to 10 L has fallen over an area of 1 m²; ergo, the basic conversation for rainfall depth (say mm) to volume is: 1 mm of rainfall depth equates to 1 L of rainwater per m².