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Permanency Desired

Categories: DRAINAGE

The expense of underdrainage demands care in every

detail of the work. The grade of the trenches should be carefully

tested. Every piece of tile should be examined. The outlet should be

guarded against displacement or entrance by animals. A good plan is to

lay the last few pieces of tile in a close-fitting wooden box, and to

protect the end with iron rods placed 2 inches apart.



If the drain is on a true grade, so that no silt will collect, there

need be no fear concerning its continued efficiency, provided water

does not run in it all the time. If it carries the water from springs

continuously, plant-roots may fill it, and tree roots are quite sure to

do so when opportunity offers. This is notably true in case of elms and

willows, but protection is afforded in such an instance by closing the

joints with cement.



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