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===Pretreatment===
 
===Pretreatment===
 
*A [[gravel diaphragm]] at the top of the slope is always recommended.  
 
*A [[gravel diaphragm]] at the top of the slope is always recommended.  
*When filter strip slopes are greater than 5%, a series of [[level spreaders]] or gravel diaphragms should be used to help maintain sheet flow.  
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*When filter strip slopes are greater than 5%, a series of [[level spreaders]], [[check dams]] or gravel diaphragms should be used to help maintain sheet flow.  
 
*Filter strips should drain continuously as sheet flow until reaching a [[swales|swale]], [[bioretention]] facility, or other LID practice.
 
*Filter strips should drain continuously as sheet flow until reaching a [[swales|swale]], [[bioretention]] facility, or other LID practice.
  
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