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musa
mespilus
Is this trench functional, as in a 'French Drain'?
If 'Yes', you would be best lining the trench with geotextile to prevent soil particles from (eventually) filling all the gaps between your 10mm aggregate.
The geotextile will also prevent your aggregate just 'sinking' into the soil and (eventually) leaving a shallow, longitudinal deoression the fill effectively collapses over time.