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Gravel diaphragms are simply gravel filled trenches which act as inlet structures by redistributing concentrated flow to sheet flow: reducing the erosive power of the water and promoting infiltration. They also act as a pretreatment by settling out sediment particles before they reach any downstream structure or practice.  

Gravel diaphragms are simply gravel filled trenches which act as inlet structures by redistributing concentrated flow to sheet flow: reducing the erosive power of the water and promoting infiltration. They also act as a pretreatment by settling out sediment particles before they reach any downstream structure or practice.  

*If the contributing drainage area is solely turf (e.g., sports field), then the gravel diaphragms may be eliminated from the [[treatment train]].

If the contributing drainage area is solely turf (e.g., sports field), then the gravel diaphragms may be eliminated from the [[treatment train]].

{{textbox|Gravel diaphragms are ideal for distributing flow and providing pretreatment for  

{{textbox|Gravel diaphragms are ideal for distributing flow and providing pretreatment for