Green Roof Runoff Coefficient
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It is a larger value for areas with low infiltration and high runoff pavement steep gradient and lower for permeable well vegetated areas forest flat land.
Green roof runoff coefficient. Rational method runoff coefficients. The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff. The rational method with the runoff coefficient c is one of the most commonly used design tools for stormwater design in norway. The runoff coefficient c is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received.
The amount will be dependent on the depth and type of substrate in the green roof system. Green roofs are one of the most used green infrastructure measures to alleviate the pressure on the urban drainage system through the detention and retention of runoff. Stormwater runoff discussions of storm water runoff are typically concerned with the impervious surfaces within a certain development or a certain watershed. For sample purposes a 55 gallon barrel will be used.
The other parameters are a the area of a watershed. According to the rational method the widespread implementation of the green roofs facilities causes a reduction of the runoff coefficient of about 20 essentially originated by the increase of the permeable surfaces accordingly to the sustainable stormwater management principles. Predicted runoff depths using scs cn model showed a good linear fit with the observed runoffs. For example it is 0 9 for metal or tile roofs and up to 0 3 for green roofs.
As president of green roof blocks i ve been involved in the industry since 1980 am a leed accredited professional and a green roof professional grp. However there may be considerable runoff for larger less frequent events. Alternatively the runoff coefficient is the factor by which depending on the type of surface the effective impermeable area is calculated. In the summer a green roof can typically retain between 70 80 of the run off.
The mean runoff coefficient of green roofs was 0 58 and 0 75 for dry and wet substrate respectively. As a result a step based approach often is suggested when applying cns to green roofs. Why is it important. I the design rainfall intensity for a storm of specified recurrence interval and duration equal to the watershed time of concentration.
Averaged cn values ranged from 96 to 98 for wet substrate and from 93 to 97 for dry substrate. And q the peak storm water runoff rate due to a storm of intensity i on. V indicate that for most green roof designs there is little to no runoff from small storm events e g 1 2 inches of rainfall. A green roof will typically intercept the first 5mm and more of rainfall providing interception storage.
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