CONCRETE PRODUCTS are exposed in service to a wider
range of conditions than drain tile. The conditions may range
all the way from highly favorable to extremely severe, sometimes
in the same drainage system. Therefore, drain tile of good quality
should always be installed when long, satisfactory service is
Manson, Philip W.; Miller, Dalton G..
Making Durable Concrete Drain Tile on Packer-Head Machines.
Minnesota Agricultural Experiment Station.
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