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{{:Reservoir gravel}}
 
{{:Reservoir gravel}}
 
===Choker course===
 
===Choker course===
{{:Choker layer}}
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{{:Choker layer}} [[Geotextiles]] may be used to separate the underdrain from native soils on the vertical faces.
 
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[[Geotextiles]] may be used to enclose the underdrain on the vertical faces. It's use in horizontal layers within systems is not recommended as it has been demonstrated to [[clogging|clog]] over time in many installations.
      
==Alternative Technology==
 
==Alternative Technology==
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