The pictures below show three components of an irrigation system. Name the different components and give ONE function of EACH. Write only the answer next to the question numbers (6.1.1 to 6.1.6) in the ANSWER BOOK. 6.2 A farmer has a submersible pump in a borehole that provides water to the irrigation system of his grazing field. It takes 8 minutes to fill the 10 000-litre reservoir. Give TWO reasons for determining the flow rate of the pump. Calculate the flow rate in litres per minute of the pump. Flow rate = Content + Time (Show ALL calculations.) 6.3 A hunter shot a kudu and needs to notify the ranger of the exact location of the animal. What type of device is suitable for sending this location? 6.4 Study the pictures of two irrigation systems below and answer the questions that follow. 6.4.1 Choose the irrigation system, A or B, that is most suitable for fields on steep slopes. Motivate your answer. 6.4.2 Why would irrigation system A be preferred to system B on a planted grazing field? 6.5 The design below shows a septic tank. What is the design error in the drawing of the septic tank above? Describe the importance of installing a manhole in a septic tank. Suggest a suitable drainage system to be connected to the outlet of the septic tank. 6.6 What is the main cause of blockages in the sewage system of a town or city? 6.7 Study the images below and answer the questions that follow.

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The pictures below show three components of an irrigation system - NSC Agricultural Technology - Question 6 - 2022 - Paper 1

Question 6

The pictures below show three components of an irrigation system. Name the different components and give ONE function of EACH. Write only the answer next to the ques... show full transcript

Worked Solution & Example Answer:The pictures below show three components of an irrigation system - NSC Agricultural Technology - Question 6 - 2022 - Paper 1

Step 1

6.1.1 Name of Component 1 and Function

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Irrigation timer/Irrigation controller/Smart controller: This device controls the flow of water by turning it on and off, which is used for scheduling irrigation.

Step 2

6.1.2 Name of Component 2 and Function

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Electronic valve/Solenoid valve/Irrigation valve: This component regulates the one-directional flow of water in an irrigation system.

Step 3

6.1.3 Name of Component 3 and Function

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Sprinkler/sprayer: This device is used to distribute water onto the plants, mimicking the effects of rain.

Step 4

6.2.1 Give TWO reasons for determining the flow rate of the pump.

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For correct calibration of the sprayers to ensure optimal water output.
To effectively schedule irrigation for better water management.

Step 5

6.2.2 Calculate the flow rate in litres per minute of the pump.

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Flow rate calculation:

ext{Flow rate} = rac{ ext{Content}}{ ext{Time}} = rac{10,000 ext{ litres}}{8 ext{ minutes}} = 1,250 ext{ litres/minute}

Step 6

6.3 Type of device suitable for sending location

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GPS or Tablet: These devices are capable of pinpointing and relaying exact locations.

Step 7

6.4.1 Choose the irrigation system, A or B, that is most suitable for fields on steep slopes. Motivate your answer.

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B: This system prevents runoff water, minimizing soil erosion, and is typically used on level surfaces.

Step 8

6.4.2 Why would irrigation system A be preferred to system B on a planted grazing field?

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System A is more versatile as it can work with implements on land and requires less effort to manage due to its automated features.

Step 9

6.5.1 What is the design error in the drawing of the septic tank above?

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The outlet is higher than the inlet, and there is no partition wall, which may lead to backflow and inefficient waste management.

Step 10

6.5.2 Describe the importance of installing a manhole in a septic tank.

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A manhole allows for general maintenance, helps in removing solids, adds bacteria for waste breakdown, and prevents clogging of inlets and outlets.

Step 11

6.5.3 Suggest a suitable drainage system to be connected to the outlet of the septic tank.

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A French drain or drainage field would be suitable for effectively managing the outflow of treated wastewater.

Step 12

6.6 What is the main cause of blockages in the sewage system of a town or city?

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The main causes include the disposal of non-degradable materials, lack of maintenance, and root obstructions.

Step 13

6.7.1 Identify the type of filter that connects with a water softener.

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Step 14

6.7.2 Which ONE of the filters above is installed ON a micro-irrigation system?

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Step 15

6.7.3 Give ONE example where filter C will be used.

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Micro irrigation or swimming pool maintenance.

Step 16

6.7.4 Rewrite the following sentence to make the statement TRUE.

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Filtration always takes place from the inside to the outside of the filter.

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