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GEWICHT PER BUIS (werkende lengte 100 cm.)<br />

Inwendige diameter I Gresbuis Rondo betonbuis<br />

i<br />

30 cm 65 kg 115 kg<br />

35 „ 80 „ —<br />

40 ,. 100 „ 185 „<br />

50 „ — 265 „<br />

60 „ 365 „<br />

70 „ 445 „<br />

l !<br />

Kleine duikers, O 30 cm, worden veelal, vooral bij weinig stroomend water,<br />

hooger gelegd dan do slootbodem, 5 a 10 cm, om verstopping to voorkomen.<br />

50

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