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Page 27 - A second object of underdrainage is to dry the ground quickly after a freeze. When the frost comes out of the ground in the spring, the thawing is quite as much from the bottom as from the top. If the land is underdrained, the water when released by thawing from below will be immediately carried away. This is particularly important in road drainage, since the foundation will then remain solid and the road itself will not be cut up.