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→Choker course
{{:Reservoir gravel}}
{{:Reservoir gravel}}
===Choker course===
===Choker course===
{{:Choker layer}} [[Geotextiles]] may be used to separate the underdrain from native soils on the vertical faces.
{{:Choker layer}} Geotextiles may be used to separate the underdrain from native soils on the vertical faces.
==Alternative Technology==
==Alternative Technology==