Roof Rainwater Runoff

Fumes from industry and traffic.

Roof rainwater runoff.

Use this water to irrigate garden plants. How water runs off a roof depends on the amount of rainfall and how quickly it needs to drain. Install a rain barrel or cistern to catch stormwater runoff from roofs. Another simple and straightforward way is to make sure that the landscape of your garden is permeable including your hardscaping paths decks and driveways.

Step 1 determine the footprint of your structure f in square feet. For slopes consider creating a dry creek to catch slow down and direct runoff perhaps to a rain garden see below. To calculate the runoff from any given rainfall. If your downspouts are connected directly to a storm drain disconnecting them is the single most important step you can take to reduce runoff.

Rainwater runoff from your roof contains a mix of materials deposited by pollution and animals as well as chemicals used in the manufacture of the shingles. While this is a normal aspect of roofing and gutters water that pours off of a roof and drenches an area like a door stoop or porch not only makes these spots slippery but water falling. Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.

Multiply the two figures together to obtain the square footage of your roof step 2 determine the percentage of water collected from each downspout p. These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area. The drainage system of any roof can be located at the edge or in the middle of the roof. Plant a rain garden.

Count the number of downspouts coming from your roof. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. The answer is about 623 gallons. Measure along the length of the house or building and along the width of the house or building in feet.

A 1 000 square foot roof can produce more than 600 gallons 2 271 2 l of runoff for every 1 of rain that falls on it. Take the dimensions of the footprint of your roof and convert them to inches. Last week i talked a bit about how a green roof is one way to help manage stormwater runoff. Use a shallow gravel filled trench to catch and slow runoff especially at the base of a slope or alongside a driveway or patio.