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The water infiltrates into the soil and is stored in its pores. When all the pores are filled with water, the soil is said to I need drained w saturated and no more water can be absorbed; when rain or irrigation continues, pools may form on the soil surface Fig.

Znaczenie DRAIN, definicja w Cambridge English Dictionary-Słowniku języka angielskiego Cambridge

During heavy rainfall the upper soil layers become saturated and pools may form. Water percolates to deeper layers and infiltrates from the pools.

Part of the water present in the saturated upper soil layers flows downward into I need drained w layers and is replaced by water infiltrating from the surface pools. When there is no more water left on the soil surface, the downward flow continues for a while and air re-enters in the pores of the soil.

This soil is not saturated anymore.

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However, saturation may have lasted too long for the plants' health. Plant roots draoned air as well as water and most plants cannot withstand saturated soil for long periods rice is an exception.

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Besides damage to the crop, a very wet soil makes the use of machinery difficult, if not impossible. The water flowing from the saturated soil downward to deeper layers, feeds the groundwater reservoir.

needd As a result, the groundwater level often called groundwater table or simply water table rises. Following heavy rainfall or continuous over-irrigation, the groundwater table may even reach and saturate part of the rootzone see Fig. Again, if this situation lasts too I need drained w, the plants may suffer.

Measures to control the rise of the water table are thus necessary.

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Excess water may be caused by rainfall or by using too much irrigation water, but may also have other origins such as canal seepage or floods. In very dry areas I need drained w is often accumulation of salts in the soil. Most crops do not grow well on salty soil.

Salts can be washed out by percolating irrigation water through the rootzone of the crops. To achieve sufficient percolation, farmers will apply more water to the field than the crops need.

But the salty percolation water will cause the water table to rise. Drainage to control the water table, therefore, also serves to control the salinity of the soil see Chapter 7.

Drainage can be either natural or artificial. Many areas have some e drainage; this means that excess water flows from the farmers' fields to swamps or to lakes and rivers.

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Natural drainage, however, is often inadequate and artificial or man-made I need drained w is required. There neec two types of artificial drainage: This is normally accomplished by shallow ditches, also called open drains. The shallow ditches discharge into larger and deeper collector drains.

It's common for many wall planters to not have drainage as . Start simple (a cool cement planter from a Queen W. shop maybe) and go from. Why do I need a drain? p.3 How long will I have the drain for? p.4 What are the w t r. What are the risks? You need to be aware of any potential problems. In. A water heater needs to be properly drained as part of its regular maintenance. Draining helps ensure the long life of your water heater by.

In order to facilitate the flow of excess water toward the drains, the field is given an artificial slope by means of land grading see Fig. The field is given an artificial slope I need drained w facilitate drainage 6. It is accomplished by deep open drains or buried pipe drains.

I need drained w Deep open drains The excess water from the rootzone flows into the open drains see Fig. The disadvantage of this type of subsurface drainage is that it makes the use of machinery difficult. Control of the groundwater table by means of deep open drains ii.

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Pipe drains Pipe drains are buried pipes with openings through which the soil water can enter. The pipes convey the water to a collector drain see Fig.

I need drained w Control of the groundwater table by means of buried pipes Drain pipes are made of clay, draind or plastic. They are usually placed in trenches I need drained w machines. In clay and concrete pipes usually 30 Lonely cheating wives Oshawa city long and 5 - 10 cm in diameter drainage water enters the pipes through the joints see Fig.

Flexible plastic drains are much longer up to m and the water nfed through perforations distributed over the entire length of the pipe see Fig.

CHAPTER 6 - DRAINAGE

Clay pipes top and flexible plastic pipe bottom iii. Deep open drains versus pipe drains Open drains use land that otherwise could be used for crops. They restrict the use of machines.

They also require a large number of bridges and culverts for road crossings and access to the fields. Open drains require frequent maintenance weed control, repairs, etc. I need drained w contrast to open drains, buried pipes cause no loss of cultivable land and maintenance requirements are very limited.

The installation costs, however, of pipe drains may be higher due to the materials, the equipment and the skilled manpower involved.