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The important characteristics of the stone within the reservoir or [[underdrain]] are the lack of fines, the void ratio and (to a lesser extent) the permeability.
The important characteristics of the stone within the reservoir or [[underdrain]] are the lack of fines, the void ratio and (to a lesser extent) the permeability.
Porosity and permeability are directly influenced by the size, gradation and angularity of the particles <ref>Judge, Aaron, "Measurement of the Hydraulic Conductivity of Gravels Using a Laboratory Permeameter and Silty Sands Using Field Testing with Observation Wells" (2013). Dissertations. 746. http://scholarworks.umass.edu/open_access_dissertations/746</ref>
Porosity and permeability are directly influenced by the size, gradation and angularity of the particles <ref>Judge, Aaron, "Measurement of the Hydraulic Conductivity of Gravels Using a Laboratory Permeameter and Silty Sands Using Field Testing with Observation Wells" (2013). Dissertations. 746. http://scholarworks.umass.edu/open_access_dissertations/746</ref>
==Stone for erosion control==
Aggregates used to line [[swales]] or otherwise dissipate energy (e.g. in [[forebays]])should have high angularity to increase the permissible shear stress applied by the flow of water. However, in some surface landscaped applications there may be a desire to use a rounded aggregate such as 'river rock' for aesthetic reasons.