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  1. Mike_Civil

    Void Ratios for stormwater retention facilities

    I never use a void ratio for the bio soil, and 30-40% is typical for the perm rock. If you need to cite a source, look at Contra Costa's C3 guide: V1 is the floodable volume above the soil layer (that is, the total volume of surface storage when the facility just begins to overflow). V2 is the...

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