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Excavate trench 300mm wide for 100mm clay field drain pipe and backfill with gravel

Land drainage (cont'd)

trench depth, 500mm trench depth, 750mm trench depth, 1000mm

Excavate trench 225mm wide for 100mm clay field drain pipe and backfill with gravel trench depth, 500mm trench depth, 750mm trench depth, 1000mm

Excavate trench 300mm wide for 100mm clay field drain pipe and backfill with gravel trench depth, 500mm trench depth, 750mm trench depth, 1000mm m m m

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