| Author | Khan, Choudhury Md. Amiruddin |
| Call Number | AIT Thesis no. 1066 |
| Subject(s) | Irrigation research--Bangladesh
|
| Note | A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Engineering at the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The study was conducted in the Dacca-Narayanganj-Demra (D- N-D) irrigation project of Bangladesh during the dry season of 1978. It is primarily
concerned with the determination of water use efficiency and the measurement
of water adequacy at the lateral unit level within the service area. To fulfill these objectives, the main data colleced were: (1) flow measurement at the selected laterals off-takes from the main canal (2) rainfall and
evaporation, (3) water use by evapotranspiration, and seepage and percolation, (4) water stress measurement, and (5) yields from the sample fields.
The results revealed that water requirement for evapotranspiration and seepage and percolation varied from 6.9 to 7.5 mm/day in different
lateral areas with a mean value of 7.3 mm/day. Average seepage and percolation rate in different lateral s ranged from 2.38 to 3.44 mm/day with a mean value of 2.9 mm/day. Water use efficiencies at the lateral level s varied from 61.8 to 73.0 percent. The average efficiency was found to be 67 percent.
Percent area adequately irrigated during the season was found highest in the first section of all the selected laterals and then a significant decrease in areas further downstream along the lateral . The average area adequately irrigated in different laterals varied from 72 to 90 percent. Water stress, which is a measure of the water adequacy in an area,
was found to be significantly affecting rice yields. Stress during the
reproductive period reduced yield by as much as three times more than
the yi eld reducti on caused by stress in the vegetative period.
High water use effici ency was found to be associated with low water
adequacy and vi ce-versa for each lateral service area. A 100 percent
water adequacy in the service areas of the three laterals would requi re the
water use efficiency to go down to about 54 percent. |
| Year | 1978 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Arbhabhirama Anat ; Bhuiyan, Sadiqual Islam
|
| Examination Committee(s) | Apichart Anukularmphai ;Eggers, Helmut |
| Scholarship Donor(s) | Government of Canada |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1978 |