Guided by - Prof. Manalishah: Name Enrollment No
Guided by - Prof. Manalishah: Name Enrollment No
Guided by - Prof. Manalishah: Name Enrollment No
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A cross regulator is provided on the parent channel at the
downstream of the off taking canal to head up the water level
and to enable the off taking channel to draw the required
supply.
OR
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1. Usually a bridges on the cross regulator, which provides a
means of Communication.
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A Distributary Head Regulator is provided at the head of the
offtaking channel to control the supplies entering the offtaking
canal or distributary.
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1. They regulate or control the supply of water to the offtaking
channel from the parent channel
4. They help in shutting off the supplies when not needed in the
offtaking channel is required to be closed for repairs
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A canal escapes is a structure constructed on an irrigation
canal for the disposal of surplus water from the canal.
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a) Classification based on the purpose
1. Surplus water escape
2. Canal scouring escape
3. Tail escape
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A surplus water escape is a structure constructed on the an
irrigation channel to the dispose of surplus water from the
channel.
It is also known as Canal Surplus Escape.
The capacity of the escape channel may be 1 3 to 1 2of the
capacity of the channel.
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The canal scouring escape is constructed in the bank of the
canal for the purpose of scouring off excess silt from time to
time.
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An irrigation canal generally ends in a natural drain or river.
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In order to control the silt entry into the offtaking canal the
disttibutary head regulator is provided with a Raised Crest.
If the Raised Crest level of the distributary head regulator is
kept 0.3 to 0.6 m higher than the u/s bed level of the parent
channel.
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Following devices are used to reduce the silt entry into
the offtaking channel :
1. King’s vanes
2. Gibb’s groyne wall
3. Cantilever skimming platform
4. Curved wings
5. Curved wings with sediment vanes
6. Desilting basins
7. Vortex tube
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1) King’s Vane
2) Gibb’s Groyne
Wall
3) Cantilever Skimming
Platform
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Canal outlet is a structure or device through which water is
released from a disturbing channel into a water course or
field channel.
Thus an outlet is a sort of head regulator for a water course
which supplies water to the fields.
The discharge through an outlet is usually not less than 0.03
cumec & not more than 0.085 cumec.
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It should be simple in design ,construction and maintenance.
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A non–modular outlet is the outlet whose discharge depend
upon the difference in ware levels of both the distributing
channel and the water course.
The discharge through through a non – modular outlet ,
therefore, varies with the variation of water levels in both the
distributary and the water course.
For example:
Submerged pipe outlet
Masonry sluice and orifice
Wooden shoots
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A semi modular outlet is the outlet whose discharge depends
only upon the water level in the distributary and is
independent of the water level in the water course.
For example :
Pipe outlet
Kennedy’s gauge outlet
crump’s open flume outlet
Pipe cum open flume outlet
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A modular outlet is the outlet whose discharge is
independent of the water levels of both the distributary and
the water course.
Thus, a modular outlet maintains a constant discharge
irrespective of variation of water levels in the disrtributary and
the water course
For example :
Gibb’s rigid module
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Flow meter or parshall flume is a device for measuring water
flowing in irrigation channels or canals by measuring the loss
of head of a stream passing through the flume.
It can be used to measure water flow in streams of varying
sizes from of very small one to a very large one.
Different sizes of parshall flumes are used for the purpose.
Smaller ones are used in irrigation channels and large ones
in canals.
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A parshall flume consists of three main section :
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http://www.slideshare.net/bibhabasumohanty/canal-
regulation-works-m4pptx
https://www.google.com/search?q=distributary+head+regulat
or&espv=2&biw=1366&bih=662&source=lnms&tbm=isch&sa
=X&ved=0ahUKEwj0ppy6n63PAhUFqo8KHaalAvUQ_AUIBy
gC#imgrc=C1-2v_bfIKJqnM%3A
https://www.google.co.in/
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