Roof Water Runoff Calculator

The catchment areais multiplied by the depth of rain that falls on it to give the total volumeof waterproduced.

Roof water runoff calculator.

It s one of the greatest threats to clean water in america today. How to calculate roof runoff. Calculate your drainage install on site. Then click on the outer points of your roof and a polygon will instantly be created.

Submit your design let nds evaluate and help you with preparation of your submittal drawings and specs. The drainage system of any roof can be located at the edge or in the middle of the roof. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. The new nds app is the perfect tool for determining runoff and system requirements on the go.

Use the zoom tool in the lower right hand corner of the map to get closer so you can see draw on your roof. Once you have the square footage number enter it into the rainwater collection calculator above. Calculate the total area of your roof. Rain barrels store and reuse rainwater helping to reduce the overtaxing of sewer systems and protect the quality of groundwater.

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. National stormwater calculator help prevent pollution by controlling stormwater runoff. The area measurement will appear right above the map. Factors such as evaporation wetting and soaking into the ground are not considered here.

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. Standing water in your basement driveway or yard. A simple rain catchment system can provide water for outdoor use resulting in. Increasing the angle of a flat roof will always increase the speed of water movement across the surface.

For a rectangular house this is simply done by multiplying the length by the width of the roof. The calculator has two primary functions. Box gutter with rain water head at end of box gutter. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.

Although this calculation is simple in principle the units can make it a headache. The first is that it will size a rain garden for you that treats 1 of rainfall. 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.