Changes

==Reservoir Stone==

==Reservoir Stone==

[[File:Particle void ratio.png|thumb|Highest void ratio comes from having uniformly graded aggregate.]]

[[File:Particle void ratio.png|thumb|The highest void ratio is found in uniformly graded aggregate, as there are no smaller particles to occupy the inter-particle pores.]]

[[File:Particle permeability.png|thumb|Higher permeability comes from larger, angular, uniformly graded aggregate]]  

[[File:Particle permeability.png|thumb|Higher permeability is found in larger, angular, uniformly graded aggregate. This is due to larger pore sizes and lower tortuosity.]]  

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>