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→Choker course
===Reservoir gravel===
===Reservoir gravel===
{{:Reservoir gravel}}
{{:Reservoir gravel}}
===Choker course===
===Choker layer===
{{: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.