Sources of Percolated Water in the Track
Water can percolate to the
formation of the track through any of the following methods.
By gravity This
includes water that collects due to rains, etc., moving into the subgrade
because of the effect of gravity. This movement is resisted by the permeability
of the soil. The effective ways of reducing the progress of water by this
method are the following.
(a) Provision
for drainage on the top of the embankment in the form of cross fall, side
drains, lowering of cess, etc.
(b) Turfing
of side slopes of the embankment.
By capillary action At times
water rises into the subgrade by way of capillary action. The capillary
rise of water can be prevented by providing a pervious layer in the embankment
which serves a capillary break.
From adjacent areas In this
case, water from some nearby source seeps into the subgrade. Water
seepage can be reduced by taking the following steps.
(a) Diverting
the original source of water
(b) Providing
effective paved catch water drains
(c) Providing
inverted filters and underground drains
By hydroscopic action from
atmosphere The moisture present in the atmosphere is
comparatively very small and has very little effect on the total moisture
content of the soil.
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