Complete the table below regarding different irrigation systems - NSC Agricultural Technology - Question 6 - 2018 - Paper 1
Question 6
Complete the table below regarding different irrigation systems. Write only the answer next to the question numbers (6.1.1 to 6.1.4).
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Worked Solution & Example Answer:Complete the table below regarding different irrigation systems - NSC Agricultural Technology - Question 6 - 2018 - Paper 1
Step 1
6.1.1 Sprinkler irrigation consisting of several segments of pipe joined together and supported by trusses, mounted on wheeled towers with sprinklers positioned along its length. Permanently fixed to a middle point.
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Centre pivot irrigation: This is a method of irrigation where water is distributed via a rotating sprinkler system on wheeled towers. It ensures an efficient and uniform distribution of water over large areas.
Step 2
6.1.2 Hydroponics
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PVC pipes with plastic or brass sprinklers: This system allows plants to grow without soil, utilizing a nutrient-rich water solution delivered directly to the plant roots.
Step 3
6.1.3 A series of pipes, each with a wheel of about 1.5 m diameter. Sprinklers along its length with an engine installed at the middle of the pipe system for driving the system.
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Sprinklers can irrigate areas such as small farms, parks, and pastures: This system uses a traveling gun sprinkler setup to cover larger areas efficiently.
Step 4
6.1.4 Travelling gun sprinkler
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Lateral wheel line irrigation: This method utilizes coupled aluminum pipes on steel wheels for mobility, allowing targeted watering of crops in a linear fashion.
Step 5
State FOUR disadvantages of using a flood irrigation system.
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When water supply is weak, flood irrigation is impossible.
Surface gradient (steep) leads to erosion.
Infiltration tempo not constant.
High costs of leveling of land.
Step 6
6.3.1 Sand filter
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Prevent blockage of sprinkler nozzles / filters the water.
Step 7
6.3.2 Sprinkler
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Provide water to plants.
Step 8
6.3.3 Pump
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Provide water to the system / sprinklers.
Step 9
6.3.4 Solenoid valve
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Controlling the water flowing through the system.
Step 10
6.3.5 One way valve
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Prevent water from flowing back to the pipe.
Step 11
6.4.1 Name devices A and B above.
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A: Tensiometer
B: Evaporation pan / Class – A pan.
Step 12
6.4.2 What is the main purpose of the devices shown above?
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To determine the water evaporation rate in a specific field.
Step 13
6.5 Name TWO devices that are used to control garden watering systems.
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Electronic irrigation timer
Mechanical timer.
Step 14
6.6 Describe the operation of a septic tank drainage system.
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Sewage is broken down by anaerobic bacteria in the first tank. Very little solids remain when the watery sewage flows to the second tank. Only liquid sewage remains and drains away through the outlet pipe or stone trench.
Step 15
6.7 Name THREE points to consider when identifying a suitable location for installing a septic tank.
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The tank should not be built near boreholes and drinking water installations.
A suitable distance away from the house.
Not near traffic.
Step 16
6.8 Describe the operation of a pipe drainage system.
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The water drains through the surface gravel and seeps into the pipe's perforations before traveling out the end of the pipe into an area that can accommodate extra water.
Step 17
6.9 Name THREE types of water purification systems that use a membrane to purify household water.
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