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well i would put about 5 gallons of soil in there, maybe a tiny bit less so it does not overflow.
The answer depends on the thickness of the covering layer. That, in turn will depend on what the soil is for: lawn will require less depth than flower beds.
lines that all the points on it have the same head pressure and eqipotential lines are always prependicular to the stream lines .
It depends on the density of the soil. If the soil is compacted or stepped on or moist of dry the amount of soil in 1m x 1m x 1m is going to vary. The density of loose soil is about 1200 kg per m3
750 square units of soil.