Roof Rainwater Runoff Calculator

For a rectangular house this is simply done by multiplying the length by the width of the roof.

Roof rainwater runoff calculator.

Although this calculation is simple in principle the units can make it a headache. As your roof surface is the catchment area for harvesting rainwater it s important to know how large or small it is so you can calculate how much rainwater you can expect to harvest. However flat roofs are not really flat. How to calculate roof runoff.

What is the standard pitch for a roof. Take the dimensions of the footprint of your roof and convert them to inches. 512 490 0932 501 w powell ln 206 austin tx 78753 harvesting rain conserving water and managing stormwater in texas since 2004. Rain barrels store and reuse rainwater helping to reduce the overtaxing of sewer systems and protect the quality of groundwater.

Wondering how much rainwater you could collect off your roof. When planning your home and landscaping drainage needs it is necessary to accurately calculate the amount of rain runoff from your roof. They would be more accurately called low slope roofs. A simple rain catchment system can provide water for outdoor use resulting in.

Contemporary houses often have flat roofs which shouldn. Here you can easily find how much rainwater you can collect from you roof how much you need to remove from a courtyard or how much runoff you can expect from an area of land. This is especially important if you are installing a rain catchment system for use in irrigating your garden or lawn. However calctool s unit menus remove this issue doing all the unit conversion for you.

Box gutter with rain water head at end of box gutter. Calculating your roof surface area building plans offer the easiest way to calculate your roof surface area after all the numbers should all be on there. Getting water off a flat roof sounds like a tricky scenario. Calculate the total area of your roof.

To calculate the runoff from any given rainfall. In this example 600 x 240 x 1 144 000 cubic inches of water. Use this rainwater harvesting calculator to find the answer. Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments.

Before you know what size rain barrels or cisterns to install you will need to calculate the average amount of rain runoff from your roof.