How Much Runoff In Washington Roof

To calculate the runoff from any given rainfall.

How much runoff in washington roof.

Runoff of course occurs during storms and much more water flows in rivers and as runoff during storms. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. Rain barrel supplies list. If your roof plan is more complicated break it up into smaller.

The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff. I do suggest hanging gutters as high as possible so that water does not over shoot them. 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 sample purposes a 55 gallon barrel will be used.

For a rectangular house this is simply done by multiplying the length by the width of the roof. The study plan can be found at the link below. The anacostia watershed society offers a rebate of 10 to 15 per square foot to help defray costs of installing a green roof. 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.

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. The rebate is available for residential or commercial buildings. Take the dimensions of the footprint of your roof and convert them to inches.

In this example 600 x 240 x 1 144 000 cubic inches of water. Step 1 calculate the total area of your roof. 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. When you look at the numbers it s surprising how much water you can collect every time it rains.

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. 1981 2010 source national weather service. 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. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above.