How Much Runoff In Washington Roof

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.

How much runoff in washington roof.

The 2016 wsc project design calls for chemical analysis of the roof runoff and will test zebrafish coho salmon juveniles and a water bug called ceriodaphnia dubia for acute toxicity from the runoff water. For a rectangular house this is simply done by multiplying the length by the width of the roof. The rebate is available for residential or commercial buildings. 1981 2010 source national weather service.

Runoff of course occurs during storms and much more water flows in rivers and as runoff during storms. To calculate the runoff from any given rainfall. Also outlined are the steps to build your own rain barrel to collect water from your roof and downspout for all outdoor uses like watering and cleaning. For example in 2001 during a major storm at peachtree creek in atlanta georgia the amount of water that flowed in the river in one day was 7 percent of all the streamflow for the year.

Take the dimensions of the footprint of your roof and convert them to inches. When installing a metal roof that has considerable formed thickness to is such as a shake or tile profile using 6 gutters would work better than 5 again to keep. The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff. You can help solve our winter stormwater runoff problems by connecting a hose to the drain valve on your rain barrel or cistern and running it out into a lawn or landscape.

Then just open the drain valve in october and let the barrel slowly drain out between big storms to slow our runoff all winter. Step 1 calculate the total area of your roof. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. My own house with a metal roof of course is a 12 12 pitch and everything is just fine.

The study plan can be found at the link below. When you look at the numbers it s surprising how much water you can collect every time it rains. I do suggest hanging gutters as high as possible so that water does not over shoot them. Rain barrel supplies list.

Roof repair replace entire roof install new roof skylight other or call us directly 1 888 668 8262 though the average lifespan of a roof can be dependent on the materials used the quality of the work done and the conditions of your home there is pretty much a guarantee that at some point in your life as a homeowner you will have to do roof. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. The anacostia watershed society offers a rebate of 10 to 15 per square foot to help defray costs of installing a green roof. In this example 600 x 240 x 1 144 000 cubic inches of water.