This document discusses various irrigation methods, including uncontrolled surface flooding, controlled flooding using check basins or ring basins, border strip method, deep furrow method, traditional methods like levees and canals, drip irrigation, subsurface drip irrigation, sprinkler irrigation using micro sprays or micro jets, and rain guns. It compares the advantages and disadvantages of different methods and discusses their suitability based on factors like crop type, soil type, water availability, and farming practices.
describes the irrigation and irrigation requirements of different crops. this ppt also describes about different methods to measure the soil moisture availability.
describes the irrigation and irrigation requirements of different crops. this ppt also describes about different methods to measure the soil moisture availability.
This power point presentation will give a complete idea of types of irrigation, water requirement of crops, duty, delta, canal revenue etc. This presentation also contain the numerical for complete understanding the concepts.
This Presentation covers the topic of surface and subsurface tile drainage which is the part of canal irrigation. The content covered in this has been explained thoroughly with theory and Diagrams related to the topics and consists of various pictures to explain the content completely .Thank you.
For More Visit - www.civilengineeringadda.com
Irrigation Efficiency
Water conveyance Efficiency
It takes into account, conveyance or transit losses such as seepage through canal and evaporation through it.
η_c=W_f/W_r ×100
Where, Wf = water delivered to the field
Wr = water delivered from river or stream
Water Application Efficiency
It is the ratio of water stored in root zone to the water delivered to the field.
η_a=W_s/W_f ×100
Where, WS = water weight stored in root zone
WS = Wf – deep percolation – runoff
Wf = water delivered to the field
This efficiency is also called as farm efficiency and it depends on the irrigation technique that has been adopted.
Water use efficiency
It is the ratio of water used beneficially or consumptively to the water delivered to the field.
η_u=W_u/W_f ×100
Where, Wf = water delivered to the field
WU = consumptively used water
Water Storage Efficiency
This is the ratio of actual water stored in the root zone to the water needed to be stored to bring the moisture content upto field capacity.
Water Distribution efficiency
This evaluate the degree to which water is uniformly distributed to the root zone throughout the field area.
η_d=(1-y/d)×100
Where, d = average depth
y = Average numerical deviation in the depth of water stored from the average depth stored during irrigation
Question – the depths of penetration along the length of a border strip at points 30 m apart were proved. There observed values are 2 m, 1.9 m, 1.8 m, 1.6 m and 1.5 m. Compute the water distribution efficiency.
Solution –
Water distribution efficiency,
η_d=(1-y/d)×100
Where, d = average depth
d = (2+1.9+1.8+1.6+1.5)/5=1.76
And y = average numerical deviation
y = 1/5((2-1.76)+(1.9-1.76)+(1.8-1.76)+(1.76-1.6)+(1.76-1.5)=0.168
Therefore,
η_d=(1-0.168/1.76)×100
η_d=90.45%
Consumptive Use Efficiency
It is the ratio of water used consumptively to the net amount of water from the root zone.
Sprinkler Irrigation is a method of applying irrigation water which is similar to rainfall.
Water is distributed through a system of pipes usually by pumping at pressure above 2 kg/cm2.
It is then sprayed into the air and irrigated entire soil surface through spray heads so that it breaks up into small water drops which fall to the ground.
Pressurized irrigation through devices called sprinklers.
This power point presentation will give a complete idea of types of irrigation, water requirement of crops, duty, delta, canal revenue etc. This presentation also contain the numerical for complete understanding the concepts.
This Presentation covers the topic of surface and subsurface tile drainage which is the part of canal irrigation. The content covered in this has been explained thoroughly with theory and Diagrams related to the topics and consists of various pictures to explain the content completely .Thank you.
For More Visit - www.civilengineeringadda.com
Irrigation Efficiency
Water conveyance Efficiency
It takes into account, conveyance or transit losses such as seepage through canal and evaporation through it.
η_c=W_f/W_r ×100
Where, Wf = water delivered to the field
Wr = water delivered from river or stream
Water Application Efficiency
It is the ratio of water stored in root zone to the water delivered to the field.
η_a=W_s/W_f ×100
Where, WS = water weight stored in root zone
WS = Wf – deep percolation – runoff
Wf = water delivered to the field
This efficiency is also called as farm efficiency and it depends on the irrigation technique that has been adopted.
Water use efficiency
It is the ratio of water used beneficially or consumptively to the water delivered to the field.
η_u=W_u/W_f ×100
Where, Wf = water delivered to the field
WU = consumptively used water
Water Storage Efficiency
This is the ratio of actual water stored in the root zone to the water needed to be stored to bring the moisture content upto field capacity.
Water Distribution efficiency
This evaluate the degree to which water is uniformly distributed to the root zone throughout the field area.
η_d=(1-y/d)×100
Where, d = average depth
y = Average numerical deviation in the depth of water stored from the average depth stored during irrigation
Question – the depths of penetration along the length of a border strip at points 30 m apart were proved. There observed values are 2 m, 1.9 m, 1.8 m, 1.6 m and 1.5 m. Compute the water distribution efficiency.
Solution –
Water distribution efficiency,
η_d=(1-y/d)×100
Where, d = average depth
d = (2+1.9+1.8+1.6+1.5)/5=1.76
And y = average numerical deviation
y = 1/5((2-1.76)+(1.9-1.76)+(1.8-1.76)+(1.76-1.6)+(1.76-1.5)=0.168
Therefore,
η_d=(1-0.168/1.76)×100
η_d=90.45%
Consumptive Use Efficiency
It is the ratio of water used consumptively to the net amount of water from the root zone.
Sprinkler Irrigation is a method of applying irrigation water which is similar to rainfall.
Water is distributed through a system of pipes usually by pumping at pressure above 2 kg/cm2.
It is then sprayed into the air and irrigated entire soil surface through spray heads so that it breaks up into small water drops which fall to the ground.
Pressurized irrigation through devices called sprinklers.
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Keywords: morphometric analysis, runoff, remote sensing and GIS, SCS - method
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chapter 4-2-advanteges and disadvantages of sprincler Irrigations'mulugetakassa1988
It is a system by which water is applied above the ground in the form of spray some what resembling rainfall.
The spray (small water droplets) is caused by making the water to flow under pressure through small nozzles or sprays.
The difference is that this rainfall can be controlled in duration and intensity.
A sprinkler system conveys water through pipes and applies it with a minimum amount of losses.
advantages of sprinkler irrigation includes the following but not limited to
Accurate measurement of the applied water, rendering high water use efficiency.
Eliminates excessive losses from deep percolation, surface runoff and conveyance losses
Land with irregular topography can be irrigated by sprinklers without much leveling and land preparation.
Can be used on soils with low water holding capacity
Can be used on sloping lands
Does not require field channels and thus more areas become available for crop production .
Accurate measurement of the applied water, rendering high water use efficiency.
Eliminates excessive losses from deep percolation, surface runoff and conveyance losses
Land with irregular topography can be irrigated by sprinklers without much leveling and land preparation.
Can be used on soils with low water holding capacity
Can be used on sloping lands
Does not require field channels and thus more areas become available for crop production .
Fertigation and chemigation is possible
can be used for almost all crops and on most soils
Feasibility of frequent, small water amount applications for germination, cooling, frost protection, etc.
The closed water delivery system prevents contamination of the irrigation water.
A vast selection sprinkler nozzles facilitate the adjustment of the water precipitation rate to the intake rate of the applied water
it gives the information about various irrigation ideas and also gives information about suitability of method of irrigation according to the natural condition such as soil type etc,
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Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
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2. Irrigation water can be applied to the land in several different
ways, and the choice among alternative irrigation methods,
depends upon many factors, including:
• economics
• crop type
• soil type
• water availability and quality
• farming practices
• legal considerations and others
3. Uncontrolled surface flooding
It consists of applying water to the field without any bunds to guide the flow of water
wetting the soil surface completely.
This method is most commonly used for irrigation of crops sown by broadcasting
method viz., rice, low value pastures, lawns and millets etc.
Advantages
1. No land levelling & land shaping
2. Low labour and land preparation costs
3. Less skill required by irrigator
Disadvantages
1. Applied water is lost by deep percolation &
surface runoff
2. Low irrigation application efficiency
4. Controlled flooding
Check basin method
In this method the field is divided into square or rectangular plots of 4 to 4000 m2
guided by bunds on all the sides. v
5. Advantages
1. Water can be applied uniformly.
2. Even small streams can be used for irrigation of crops efficiently.
3. Simple and cheap when equipment is used for constructing bunds
Disadvantages
1. Unless the land is levelled, distribution of water in plot is uneven.
2. Considerable area is lost under field channels and bunds i.e.
nearly 30% of area.
3. Bunds interfere in working of inter-cultivation equipment
4. More labour is required for field layout and irrigation
6. Ring basin method
This method is a modification of check basin method and is suitable for sparsely grown
orchard crops and cucurbits.
7. Border strip method
The cultivated field to be irrigated is divided into a number of long parallel
strips, generally 3 to 15 m in width and 75 to 300 m in length separated by small
border ridges or low dykes of about 15 cm high, laid out in the direction of the
slope.
12. Subsurface drip
Water applied through small emitter openings below the
soil surface
Basically a surface system that's been buried
(few inches to a couple feet)
Permanent installation
13. Subsurface Drip Irrigation
Advantages
• High & uniform water application
• Lower pressure & power requirements
• No dry corners
• Adaptable to automation
Disadvantages
• High initial cost
• Water filtration required
• Complex maintenance requirements
Flushing, Chlorination and Acid injection
14. Salt movement under irrigation with saline water
Salt accumulation leached
downward by successive water
applications
Salt accumulation leached
radially outward from drip
tubing
Subsurface Drip Sprinkler/Flood
16. Micro spray/ micro jets
Discharge: 1gal/min/spray applicator
Low operating pressure requirements of from 0.8 to 1.5
kg/cm2, low water application rates and suitability for stony
or very coarse sandy soils
Objective: To emit water in the form of small droplets
without causing any misting
17. Micro sprinklers
• These are highly useful for high discharge requirements in case
of orchards and also where the crop canopy as well as the root
zone spread is more
• They are normally, designed to spray water to cover an area of
1 to 6 meters with a flow rate varying from 20 lph to 120 lph
18. Rain gun
• Most suitable for a variety of climates like
tropical, temperate and humid climates as in
India
• Light in weight and easy to install
• Uniform distribution profile with adjustable jet
• Long life span and low maintenance
• Better pattern coverage & good performance in
windy conditions
19. Possibilities of adapting micro irrigation
Drip irrigation
All type of crops
except some close
spaced crops
Well and tank
irrigation
Suitable for all types
of soils – sandy, clay
and saline
Sprinkler irrigation
Close spaced crops
Well, tank and
canal irrigation
Suitable for all
types of soils –
coarse sandy soils
