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2 parts [[topsoil]]<br>
2 parts [[topsoil]]<br>
1 part sand [[Bioretention: Filter media#Organic components|organic soil components]] and [[Bioretention: Filter media#Additives|additives]]
1 part sand [[Bioretention: Filter media#Organic components|organic soil components]] and [[Bioretention: Filter media#Additives|additives]]
|-
|This mixture may be assumed to have a porosity of [[0.4 unless demonstrated otherwise|Bioretention media storage]]
|This mixture may be assumed to have a porosity of 0.35 unless demonstrated otherwise
|}
|}