Roof Water Runoff Calculator

The first is that it will size a rain garden for you that treats 1 of rainfall.

Roof water runoff calculator.

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Standing water in your basement driveway or yard. The drainage system of any roof can be located at the edge or in the middle of the roof. If your roof plan is more complicated break it up into smaller more easily calculable areas and then add those areas together for the total area.

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. Submit your design let nds evaluate and help you with preparation of your submittal drawings and specs. Factors such as evaporation wetting and soaking into the ground are not considered here. Box gutter with rain water head at end of box gutter.

For a rectangular house this is simply done by multiplying the length by the width of the roof. It s one of the greatest threats to clean water in america today. Whether you re an urban planner developer landscape architect or homeowner this tool can help you balance land developments and landscaping with the right amount of green infrastructure. Take the dimensions of the footprint of your roof and convert them to inches.

For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. How to calculate roof runoff. A simple rain catchment system can provide water for outdoor use resulting in. National stormwater calculator help prevent pollution by controlling stormwater runoff.

Although this calculation is simple in principle the units can make it a headache. The calculator has two primary functions. Rain barrels store and reuse rainwater helping to reduce the overtaxing of sewer systems and protect the quality of groundwater. The area measurement will appear right above the map.

Once you have the square footage number enter it into the rainwater collection calculator above. To calculate the runoff from any given rainfall. The new nds app is the perfect tool for determining runoff and system requirements on the go. Increasing the angle of a flat roof will always increase the speed of water movement across the surface.

Then click on the outer points of your roof and a polygon will instantly be created. Calculate the total area of your roof. Calculate your drainage install on site.