Quantity of gravel to fill a soakaway

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I have a hole 800mm deep and 1300x900 wide. How much 20mm gravel do I need to order to fill it?
 
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A tonne bag is (nominally) 1m cube, so one of these should do the trick.
 
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check with the supplier, they range from 0.70 up to 1 tonne.
 
:eek: I wasn't told to use gravel when i dug my soakaway, just broken bricks with a permeable membrane on top, then soil/turf for the top 18" or so.
 
Posted: Sun Jun 21, 2009 10:02 pm Post Subject:

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A tonne bag is (nominally) 1m cube, so one of these should do the trick.


1 cubic metre of water (1000l) weighs 1 tonne. Gravel sinks, so you will need more than 1 tonne.
 
Posted: Sun Jun 21, 2009 10:02 pm Post Subject:

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A tonne bag is (nominally) 1m cube, so one of these should do the trick.


1 cubic metre of water (1000l) weighs 1 tonne. Gravel sinks, so you will need more than 1 tonne.


most bulk bags sold are not a tonne, normally closer to .8.

weight has nothing to do with density
 
A little research using good auld Google reveals that 1 cubic metre of gravel 1/4 - 2 inch is 1.682 tonnes (dry) and 2.002 tonnes (wet).
 

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