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*[[Vegetated filter strips]]}}
 
*[[Vegetated filter strips]]}}
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==Planning considerations==
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==Planning==
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The gravel diaphragm serves two purposes. First, it acts as a pretreatment device, settling out coarse particles before they reach an [[infiltration]] practice. Second, it acts as a level spreader, maintaining sheet flow as runoff flows over the filter strip. If the contributing drainage area is steep, then larger stone should be used in the diaphragm,
 
*Diaphragms can be designed along curves as readily as straight lines,  
 
*Diaphragms can be designed along curves as readily as straight lines,  
 
*As they are not a conveyance practice, they should be designed along a single contour line, promoting the level spreading function,   
 
*As they are not a conveyance practice, they should be designed along a single contour line, promoting the level spreading function,   
*Flow should be directed into the device laterally,
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*Flow should be directed into the device laterally.
    
==Design==
 
==Design==
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