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→Design Assumptions
Additional components include an [[underdrain]] to remove excess water and soil additives to enhance [[Nutrients|pollutant removal]]. <br>
Additional components include an [[underdrain]] to remove excess water and soil additives to enhance [[Nutrients|pollutant removal]]. <br>
Design assumptions used to generate cost estimates are based on a 2,000 m2 asphalt drainage area, tool default values and the following STEP recommendations:
Design and operation and maintenance program assumptions used to generate cost estimates are based on tool default values and the following STEP recommendations:
* Maximum impervious drainage area to permeable surface area (I:P area) ratio of 20:1.
* Maximum impervious drainage area to permeable surface area (I:P area) ratio of 20:1.
* Length to width ratio of bioretention area is 10:1.
* Length to width ratio of bioretention area is 10:1.