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The stormwater runoff coefficient is determined by analyzing the land use, soil type, slope, and drainage characteristics of a specific area. It is calculated by dividing the amount of rainfall that runs off a surface by the total amount of rainfall that falls on that surface. This coefficient helps in estimating the amount of stormwater runoff that can be expected from a particular area during a storm event, which is crucial for designing effective stormwater management systems. Various methods and equations, such as the Rational Method or the SCS Curve Number method, can be used to determine the stormwater runoff coefficient based on these factors.
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ProfessorOh, dude, determining storm water runoff coefficient is like figuring out how much water is gonna run off when it rains. You basically look at things like surface area, slope, and how water-resistant the ground is. It's all about predicting where the water's gonna go and how much of it there's gonna be. Easy peasy, right?
A simple coefficient chart works best. However, in the event you do not have access to such a chart; here is the general coefficient information that can be used to calculate Storm water Runoff: 1) Smooth, Impervious Surfaces, i.e., Tile, Roofing materials, Concrete walkways has a runoff coefficient of approximately 90% 2) Gravel surfaces and paved asphalt surfaces have a runoff coefficient of about 80% 3) Mitigated, engineered and or loose soils have a coefficient rating of 60% 4) Natural soils like that found in an undisturbed forest has a general coefficient rating of approximately 30% 5) Built landscape areas like "Green Roofs" should hold to and strive to reach the target of a 30% runoff coefficient rating. Use this calculation to calculate runoff: (CA) X (R) X (E) X (0.6) = Area runoff in gallons. Understanding the equation: (CA) = Catchment area in Sq. Ft. i.e., 1 Acre = 43,560 Sq.Ft. (R) = Rainfall expressed in inches (E)= efficiency expressed in decimal (0.6) = Gallons per Square feet for every inch of rain
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What type of drainage system good for storm water runoff?
any type as long as it can hold water!!Dandy bags or curb sacks are good for sediment control
What determines the amount of runoff?
One of the factors that determine whether water infiltrates is the nature of the surface. Another factor that determines is the elevation of the surface or its shape.
What is the difference between infiltration and runoff?
infiltration is different because when it happens the rain soaks underground it doesn't fall back into bodies of water like runoff does.
Can you measure the Linear expansion and coefficient of Freezing Water?
Freezing water will expand about 3% linearly as it freezes, then it will contract with a positive expansion coefficient as ice and gets colder. It can be measured using methods such as dilatometer or transducer.
Coefficient of thermal expansion of water at 300C?
This can be found from the steam tables. www.x-eng.com gives steam tables. At different temperatures and pressures wolume of water can be found. To find the coefficient of expansion of water, find the volume at 5degree lower and 5 degree higher at same pressure. Take the mean and divide with the volume of water at desired temperature. Cross check the calculation for which you have the answer. I have used the way and works well. The coefficient of expansion of water changes rapidly with temperature at constant pressure.
