Changes

==Determine maximum overall depth==

==Determine maximum overall depth==

# 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.  

# Determine what the pipe diameter needs to be and assign appropriate depth of reservoir.  

Step 2. Determine what the pipe diameter needs to be and assign appropriate depth of reservoir.  

# Determine maximum possible storage reservoir depth (''d_S''):

Step 3. Determine maximum possible storage reservoir depth (''d_S''):

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

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

{{Plainlist|1=Where:

{{Plainlist|1=Where:

===Additional step for system without underdrain===

===Additional step for system without underdrain===

# Determine maximum permissible ponding depth (''d_P''):

Step 4. Determine maximum permissible ponding depth (''d_P''):

<math>d_{P}=f'\times19.2</math>

<math>d_{P}=f'\times19.2</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

*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.}}