Linear proportional weirs for water measurement | |
| Author | Bakhsh, Allah |
| Call Number | AIT Thesis no.WA-86-11 |
| Subject(s) | Weirs Hydraulic measurements |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | In all the conventional weirs like rectangular, triangular trapezoidal and parabolic, problem is to find the discharge passing through a section of a known simple weir shape. However, the problem of computing shapes or profiles of weirs to achieve certain assumed discharge-head relations is of comparatively recent origin. This study is also aimed to investigate the hydraulic characteristics of linear proportional weirs with rectangular bottom for certain designed constants of proportionality not only as the water measurement devices but also as the distribution devices in irrigation practices. To evaluate the weir performance under different hydraulic circumstances, four thin plate weirs of width 20.0, 30.0, 40.0 and 50.0 cm for designed constants of proportionality K, of 0.10, 0.15, 0.20 and 0.25 are fabricated, respectively, and are tested in the flume and distribution box, successively. Upstream head, downstream water level are recorded by movable pointer gauges in the flume and head over the weir section is found by piezometer in case of distribution box while discharge is measured by volumetric method in both cases. The tabular and graphical representation of results depict apparently that the linear proportional weirs with rectangular bottom can be designed for any value of the dimensional constant of proportionality K, under free flow conditions . Good agreement is found between the designed and experimental values of K, and coefficient of discharge Cd . As distribution devices, the values of K, and Cd, are found to be effected by approach velocity head dependent on weir size. |
| Year | 1986 |
| 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) | Wang, Tsan-Wen |
| Examination Committee(s) | Bogardi, Janos J. ;Prida Thimakorn |
| Scholarship Donor(s) | The Government of France |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology |