Changes

[[File:Sizing Bioretention.jpg|thumb|The vertical storage zones in a bioretention cell include: ponding, mulch, filter media, choker layer, embedded pipe diameter depth and the storage reservoir.]]  

[[File:Sizing Bioretention.jpg|thumb|The vertical storage zones in a bioretention cell include: ponding, mulch, filter media, choker layer, embedded pipe diameter depth and the storage reservoir.]]  

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Many of the dimensions in a bioretention system can be predetermined according to the function of the component. There is greatest flexibility in the ponding depth and the depth of the storage reservoir beneath the optional underdrain pipe. The order of operations in calculating these dimensions depends on whether an underdrain is desired.   

Many of the dimensions in a bioretention system can be predetermined according to the function of the component. There is greatest flexibility in the ponding depth and the depth of the storage reservoir beneath the optional underdrain pipe. The table below describes some recommended values to use to begin the design process.   

{| class="wikitable"

{| class="wikitable"

|-

|-

| [[Pipes|Perforated pipe]] and surrounding [[Aggregates|aggregate]]

| [[Pipes|Perforated pipe]] and surrounding [[Aggregates|aggregate]]

| Is equal to underdrain pipe diameter

| 200 mm (diameter)

| Not applicable

| Not applicable

| 0.4  

| 0.4

|-

|-

| Storage reservoir (''d_s'')

| Storage reservoir (''d_s'')