Roof Water Runoff Calculator

Stormwater runoff calculator this calculator allows you to simulate the effects that installing a rain garden a type of green infrastructure could have on stormwater runoff from your property.

Roof water runoff calculator.

It s one of the greatest threats to clean water in america today. How to calculate roof runoff. Factors such as evaporation wetting and soaking into the ground are not considered here. Although this calculation is simple in principle the units can make it a headache.

For a rectangular house this is simply done by multiplying the length by the width of the roof. Then click on the outer points of your roof and a polygon will instantly be created. Rain barrels store and reuse rainwater helping to reduce the overtaxing of sewer systems and protect the quality of groundwater. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.

The first is that it will size a rain garden for you that treats 1 of rainfall. Box gutter with rain water head at end of box gutter. The calculator has two primary functions. Standing water in your basement driveway or yard.

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. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. National stormwater calculator help prevent pollution by controlling stormwater runoff. 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.

Calculate your drainage install on site. To calculate the runoff from any given rainfall. The drainage system of any roof can be located at the edge or in the middle of the roof. Take the dimensions of the footprint of your roof and convert them to inches.

Increasing the angle of a flat roof will always increase the speed of water movement across the surface. 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. A simple rain catchment system can provide water for outdoor use resulting in. Submit your design let nds evaluate and help you with preparation of your submittal drawings and specs.

The area measurement will appear right above the map. Once you have the square footage number enter it into the rainwater collection calculator above. The new nds app is the perfect tool for determining runoff and system requirements on the go.