24 Questions
What is the primary factor determining the final layout of a surface irrigation system?
The ability of channels to command higher ground
What is the purpose of building up the ground under proposed channels?
To provide command over higher ground
What is the function of gates in surface irrigation systems?
To control the direction of flow
What is the purpose of drop structures in surface irrigation systems?
To bring water to a channel lower in height
Why are channels in surface irrigation systems constructed with a precise gradient?
To allow for gravity-fed irrigation
What is the function of culverts in surface irrigation systems?
To allow for access roads to cross the channel
What is the primary condition for using a syphon in irrigation?
When water level in the channel is higher than the water level on the bay or furrow
What is the main advantage of using gated pipes over channels?
Increased water application efficiency
What is a limitation of using gated pipes in irrigation?
Insufficient flow capacity
What is a common material used to make syphons?
Aluminum or plastic tubes
What is a disadvantage of using channels in irrigation?
All of the above
What is the purpose of a gate in irrigation?
To divert water from the channel
What is a characteristic of surface irrigation methods?
They apply a relatively large amount of water at relatively infrequent intervals
What is a challenge in surface irrigation methods?
Applying a large amount of water evenly
Why is advance ordering of water required in areas where surface irrigation methods are used?
Because water is supplied from regulated sources
What happens when surface irrigation commences?
Water infiltrates the soil at the head of the bay or furrow
What is a consequence of surface irrigation methods?
Inherent unevenness in the amount of water applied
What strategy can be employed to minimize the problems of surface irrigation methods?
Attention to accuracy during landscaping
What is one method to control velocity of water flow in surface irrigation?
By varying the gradient along the bay or furrow
What is the main advantage of using 'giant' siphons in surface irrigation?
They can service multiple furrows from a head bay
What is one of the challenges of controlling water flow in surface irrigation?
It is not easy to manage and requires specialized devices
What is the purpose of using gates and other channel outlets in surface irrigation?
To reduce labour requirements
What is one of the ways to reduce labour requirements in surface irrigation?
By using various devices to automatically close channel checks
Why is it important to control velocity of water flow in surface irrigation?
To match intake rate along the full length of the bay or furrow
This learning module covers surface irrigation and water management in agriculture, focusing on reticulation of water and open channel distribution systems.
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