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What is this system like? The combined gravity-head ir¬rigation network consists of permanent underground delivering and watering pipe-lines and of movable flexible watering hoses. The pipe-lines and hoses are made of polyethylene or similar material. The stationary watering pipe-lines may be made of asbestos cement.
The underground delivering pipe-lines are laid along the whole length of the plot to be watered. To both sides of the pipe-line, watering pipes and movable watering hoses are pro¬vided. On a plot 2,000 metres long and 1,000 metres wide it is sufficient to have two delivering mains spaced 500 me¬tres from each other.
Flexible watering hoses are attached to water hydrants of the delivering pipe-line. The hoses and underground water¬ing pipe-lines are perforated, the holes matching the row width. The furrow method of irrigation is the most suitable one for the combined irrigation network.
Water is fed from the canal directly into the underground delivering pipe-lines via the water take-off facilities. The necessary head is created in the network by taking advantage of the natural slope of the area.
In the elevated part of the plot, where there is no ade¬quate head in the delivering pipe-line yet, watering is carried out with the aid of movable flexible watering hoses placed on the field surface. In the lower part of the plot, it is suffi¬cient to open the gates in the distributing wells to make the water rush into the underground watering pipe-lines. Flowing out of holes in these pipe-lines, the water finds its way through a 25-30 centimetres layer of soil, as little springs it flows into the furrows, moistens the soil around and reaches the roots of the plants.
The ends of the delivering and watering pipe-lines are fitted with special flushing valves which serve to free the pipe-lines of silt. When they are opened, the force of the water stream hurls the silt beyond the network.

английский язык обучение     #1   03 июн 2021 06:02   Увидели: 48 клиентов, 107 специалистов   Ответить
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Попытались ли сами что-нибудь сделать? Проверю Ваш вариант с удовольствием ))) и объясню, если будут ошибки

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Is — Present Simple, Active
Consists of — Present Simple, Active
Are made of- Present Simple, Passive
May — Modal
Are laid, are provided — Present Simple, Passive
Is — Present Simple, Active
Are attached, are perforated — Present Simple, Passive
Is — Present Simple, Active
Is fed — Present Simple, Passive
Is created — Present Simple, Passive
Is — Present Simple, Active
Is carried out — Present Simple, Active
Is, finds, flows, moistens, reaches — Present Simple, Active
Are fitted — Present Simple, Passive
Serve — Present Simple, Active
Are opened — Present Simple, Passive
Hurls — Present Simple, Active

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Огромное спасибо!

  #4   03 июн 2021 07:14   Ответить
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Пожалуйста!

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