Diversion weirs for small scale supplemental irrigation in Northeast Thailand | |
| Author | Rinfret, Jean-Rene |
| Call Number | AIT Thesis no.WA-85-48 |
| Subject(s) | Weirs Irrigation--Thailand, Northeastern |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | This study was done to evaluate the impact of small irrigate weirs on wet season rice cultivation. Three existing weirs in Khon ka province were used for this purpose. The physical characteristics the streams and watersheds were obtained by surveying and the streamflow characteristics were computed. The hydraulic properties of the outlet for diversion were examined and the volume of water diverted to the fields was computer for different storm sized. A daily water-balance model was development to compute the water depth in the paddies through the growing season. The model was run on computers and the water stress-a conditions in the crop were assessed for different cases of diversion. It was found that, because of the uncertainty of rainfall a runoff, small weirs did not eliminate the periods of water stress-a completely, even for small command areas. However, they reduced the number of days of water stress-a factor directly responsible for suppressing crop yields-to about one half of those computed under pure rainfed conditions. Significant water stress reduction was also for a small watershed of 10 square kilometers. Only a small portion the streamflow was diverted. Most of the excess water diverted return to the stream and could be again utilized by downstream weirs. |
| Year | 1985 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Rahman, Md. Ataur |
| Examination Committee(s) | Christoph, Ing. Fried ;Nielsen, Mogens Dyhr ;Prida Thimakorn |
| Scholarship Donor(s) | Canadian International Development Agency (CIDA) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1985 |