Runoff Coefficient For Roof
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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.
Runoff coefficient for roof. On a low slope fully adhered epdm roof with slope of 1 4 per foot one could justify a coefficient of 95 to 99. The runoff coefficient c is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received. One of the parameters in the rational method equation q cia is the runoff coefficient c. The other parameters are a the area of a watershed.
The runoff coefficient describes the percentage of rainfall which runs off a particular surface during a storm event. 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. Rational method runoff coefficient applications.
And q the peak storm water runoff rate due to a storm of intensity i on. Typical values are given below. Step 1 determine the footprint of your structure f in square feet. Runoff coefficient c this coefficient allows for the quantity of water which runoff a particular type of surfacing into a drainage system and discount the quantity of water which will soak into or through the surfacing.
It is possible to calculate the average runoff coefficient for non homogeneous areas considering. There are two ways you can find the runoff coefficient. Count the number of downspouts coming from your roof. The rational method considers a runoff coefficient of about 0 7 0 95 for both concrete streets and roofs the most impervious and a runoff coefficient of about 0 05 0 35 for lawns areas the most pervious.
Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. C v using datafit 9 1 32 model selection criteria. A runoff coefficient is a number that relates the rainfall rate and runoff rate. 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.
Tot per per tot imp impa a c a a. The higher the value the greater the quantity of water which will need to be dealt with by the drainage system. The formula for calculating this flow is called the maming formula. Measure along the length of the house or building and along the width of the house or building in feet.
The american society of plumbing engineers data book suggests that initially there will be some friction along the drainage path but it will quickly go to zero. Annual runoff generated roof area annual rainfall runoff coefficient 200 1000 0 9 180 000 litres or 47 520 gallons hence a storage capacity of 47 520 gallons is required to sail through the summer months with adequate water supply. Rational method runoff coefficients.
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