The alteration is intended to deflect surface water as with ditches or pipes and the alteration discharges more water or directs drainage in a way different from the natural drainage.
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In theory every lot was graded to drain so that water in the backyard flows through a swale down the sideyard to the curb or storm drain.
The surface drainage system is essentially a network of shallow channels and buried in a small 30 50 cm depth of pipes that drain water from the surface of the soil into the storm sewer and in its absence into the roadway the river on a low relief or in a special well.
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Finally if water is being retained in addition to the ground because of subsurface rock which will not permit the water to drain heavier equipment will be asked to excavate the drainage trenches.
Dig a trench even though you ve moved water away from the house your work isn t done.
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Homesites with clay soils suffer problems with lingering surface water.