Changes

==Calculate the maximum overall depth==

==Calculate the maximum overall depth==

*Step 1: Determine what the planting needs are and assign appropriate depth of media.  

*Step 1: Determine what the planting needs are and assign appropriate depth of media, using the table above.  

*Step 2: Decide on the underdrain pipe diameter.  

*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth.

*Step 3: Determine maximum possible storage reservoir depth beneath the pipe (''d_s''):

*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d_s''):

<math>d_{s}=f'\times38.4</math>

<math>d_{s}=f'\times38.4</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

*''f''' = Design infiltration rate in mm/hr, and

*''f''' = Design infiltration rate in mm/hr, and

*19.2 comes from multiplying desired drainage time of 48 hours by void ratio of 0.4. Note that conceptually the drainage of the ponded area is limited by ex-filtration at the base of the practice.}}

*19.2 comes from multiplying desired drainage time of 48 hours by void ratio of 0.4. Note that conceptually the drainage of the ponded area is limited by ex-filtration at the base of the practice.}}

* Step 5: Sum total depth of bioretention and compare to available space above water table and bedrock. Adjust if necessary.

* Step 5: Sum total depth of bioretention, and compare to available space above water table and bedrock. Adjust if necessary.

==Calculate the remaining dimensions==

==Calculate the remaining dimensions==