The past, present and future of Irrigation systems of Bangladesh.

1. Irrigation Systems in Bangladesh
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Prepared by : Md.Mokim,BSCE

2. Introduction
 Irrigation artificial water supply for dry agricultural land by means of dams,
barrages, channels, or other devices.
 Irrigation has been practiced for thousands of years, chiefly in regions with
annual rainfall of less than 500 mm, including many countries of Africa, Asia
and America.
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3. Continued … …
 Estimates of total irrigated land in the world range
from 543 to 618 million acres, almost half of them
in India, Bangladesh, Pakistan, and China.
 In modern times, pumps have facilitated the use of
underground as well as surface water.
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4. Continued … …
 In Bangladesh there has been widespread
use of both shallow and deep tube wells
for irrigation of agricultural lands
 during the dry period (November to
March). Since high yielding varieties of
rice are very susceptible to drought, these
need very frequent irrigation.
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5. Irrigation History of Bangladesh
 In 1960, systematic irrigation stated in Bangladesh with the introduction of low lift
pumps & DTWs by the government employer Hasina Hamid Khan in Comilla
district.
 STWs came into operation after 1980, Bangladesh has a land area of about 14.4
million hector of which 9.03 million ha(64%) are under cultivation.
 Irrigation is currently available to less than 50% of the land that can be irrigated in
the Rabi season.
 Now In Bangladesh there has been widespread use of both shallow and deep tube
wells for irrigation of agricultural lands, particularly during the dry period
(November to March).

6. Cont….
 According to a recent survey, water is being lifted in this country
through
 26,704 deep tubewells,
 4,69,226 shallow tubewells,
 56,829 low lift pumps, 1,42,132 manual pumps,
 and more than 5,65,000 indigenous water lifting devices.
 The irrigation efficiency is only about 30%.
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7. Irrigation devices commonly used in Bangladesh
 Irrigation devices commonly used in Bangladesh may be divided into
two main categories:
1.Motorized pumps :DTW ,STW, turbine pump, Low lift pump etc.
2.Manual pumps : Don, Swing basket , Treadle pump, Hand tube
well etc.
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8. Discuss about some familiar irrigation system
 DTW:
 The largest water lifting device for pumping groundwater
for irrigation and domestic purposes
 The well length is 60-90 m (200-300 ft)
 The engine Horsepower is 20-30
 The discharge is 56-84 lit/sec (2-3 cusec)
 STW:
 At present, shallow tubewells are used intensively in all parts of Bangladesh.
 The well length is less than 30 m (100 ft),
 The engine Horsepower is 4-8, and
 The discharge rate is less than 28 lit/sec (1 cusec).
 The pipe diameter is 10-12 cm (4-5 inches).
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9. Continued … …
Fig: Irrigation By Don Fig: Irrigation By Swing Basket
Referrence: http://en.banglapedia.org/index.php?title=Irrigation
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11. Irrigation Methods in Bangladesh
 Surface irrigation
 Subsurface irrigation
 Sprinkler irrigation
 Drip irrigation
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12. Types of Surface Irrigation
Basin Flooding
Border Flooding
Furrow Irrigation
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13. Basin Flooding
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14. Border Flooding
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15. Furrow irrigation
Furrow are narrow ditches dug on the field between the rows of crops.
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16. Sprinkler Irrigation
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17. Drip Irrigation
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18. MORDERN IRRIGATION TECHNIQUE
 Efficient because crops get correct amount of water the best
example is drip irrigation system.
 Extremely costly .A lot of investment has to be made to get a
proper irrigation system.
 Machine intensive.
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19. IRRIGATION ON THE PAST
 Farmer was more focused on subsistence rather than selling
products in the market.
 Labor intensive.
 Irrigation land used to be small.
 Highly depends on weather.
 Inefficient.
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20. WHY IS EVERYONE USING MODERN
IRRIGATION TECHNIQUES?
 These days people prefer to use modern irrigation techniques
because they are extremely efficient and effective.
 Modern irrigation techniques are also
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21. Important Factors Affecting Irrigation
Planning and Development
 Soil
 Climate
 Water source
 Labor
 Capital
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22. Positive Impacts on irrigation
 Health
 Socio-Economic
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23. Negative Impacts on irrigation
 Water quality degradation
 Groundwater abstraction
 Health risk
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24. Selection of Irrigation methods for specific
area
Hill tract
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25. Continued … … …
 Mango orchard
of Rajshahi
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26. Continued … …
 Cultivation of
Pineapple in
Mymensingh
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27. Continued … …
 Flower
harvesting in
Khulna
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28. Continued … …
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Potato field Sugarcane

29. Any Question?
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30. Thank you for listening us
Have a nice day
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