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*[[Vegetated filter strips]]}}
*[[Vegetated filter strips]]}}
==Planning considerations==
==Planning==
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,
*Flow should be directed into the device laterally.
==Design==
==Design==