Purpose The purpose of this project is to provide a series of four calculators that will allow you to easily get an approximation of:


Select general geographic region with annual rainfall recorded 
Press this button to have the calcuation answers shown below  
0.10165416666666667 
Gallons of water received weekly by one square foot of soil 
0.4066166666666667 
Gallons of water received monthly by one square foot of soil 
4.8794 
Gallons of water received annually by one square foot of soil 
213686.24 
Gallons of water received annually by one square acre of soil 
Get Your Own Sequoia. I did. 
This calculator is useful when you need to determine how many gallons of annual rainfall that you must take from a water source in order to simulate the annual rainfall of a different geographic region. For example, if you live in Las Vegas, Nevada (average of 4 inches of annual rainfall) and you are trying to grow a Giant Sequoia that normally occurs around San Francisco, California (average of 20 inches of annual rainfall), this will calculate the number of gallons that are needed in your location (Las Vegas, Nevada in this example) for the Giant Sequoia.

Enter the number of inches of annual rainfall you receive  
Enter the number of inches of annual rainfall from the geographic region the plant or tree normally lives in  
Enter the horizontal radius of the plant or tree root system in feet  
Press this button to have the calcuation answers shown below  
6489.333333333333 
Gallons of water needed weekly for the soil area with a radius of 100 feet around the plant / tree (15700 total square feet) 
25957.333333333332 
Gallons of water needed monthly for the soil area with a radius of 100 feet around the plant / tree (15700 total square feet) 
311488 
Gallons of water needed annually for the soil area with a radius of 100 feet around the plant / tree (15700 total square feet) 
Square feet comprise one acre  
Gallons of rainwater falls on one square acre of land when 1 inch of rain is measured  
Gallons of rainwater falls on one square foot of land when 1 inch of rain is measured  
Area of a circle with a given radius. pi is equal to 3.14.  