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Canopy Cover Formula <br />1. Determine the square footage of the entire site <br />2. Determine the square footage of the impervious area <br />3. Determine the square footage of the pervious area <br />4. Determine the ratio between impervious area to entire site <br />(R = impervious area/entire site) <br />5. Multiply the ratio (R) by the square footage of the pervious area to calculate the required <br />canopy cover square footage <br />Crown Cover (Canopy Cover) for a species is determined by the following formula: <br />(((min. + max spread) / 4)2) * TC (pi) * (0.65 for preferred or 0.5 for acceptable species) <br />The formula determines the average spread of a species and then divides it by 2 to get the radius <br />(these steps are combined and that is why it shows as divided by 4). Then, the area of a circle <br />(the canopy cover) is calculated, which is pi * r2. This is then multiplied by a designated factor <br />(depending on if the species is preferred or acceptable, with preferred species being credited with <br />a higher canopy cover thus the 0.65 instead of 0.5) which determines the canopy cover a <br />particular species receives credit for. <br />To fulfill the planting requirements, a combination of trees and shrubs shall meet or exceed the <br />minimum required canopy cover square footage. <br />