| Author | Pradhan, Niranjan |
| Call Number | AIT Thesis no. WA-89-16 |
| Subject(s) | Irrigation--Management
Irrigation--Automation
|
| Note | A thesis submitted in partial fulfillment of the requirements for the
degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The present research emphasizes on the calibration and evaluation
of an automatic downstream control AVIO Gate and constant flow
distributors. In the laboratory, also the leakage through the emergency
gate and the AVIO Gate were studied.
The modules were tested both for downstream submerged flow and free
flow conditions. From submerged flow data, an attempt was made to develop
nomographs which can be used as a tool to determine the flow through the
modules for any submergence and upstream and downstream head difference
by interpolation.
Under downstream submergence, the commencement of orifice flow for
Single Baffle Module could not be ascertained due to more effect of
submergence. But for the Double Baffle Module except the first falling
stage the second falling stage could be ascertained, which shows that the
module is more suitable for submerged condition. In case of free flow
for both the modules, this falling stage nature is clearly seen within
the specified head range above the sill. The coefficients of discharge
for weir flow and orifice flow have been determined.
From the performance study of the gate separately and associated with
modules it is seen that the constant downstream level control gate is
really an effective means of making more rational use of available water
supplies and of running canal systems on a more economical basis. It also
provides an attractive and original answer to the problem of equipping
water offtakes and other free surface control works required to maintain
a definite downstream water level.
The actual flow through the distributors in downstream free flow
condition varies from the design flow rates at 5% to 15% and in downstream
submerged condition the flow rate variation remains within the range of
20% to 30%. |
| Year | 1989 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Loof, Rainer;Paudyal, Guna N.; |
| Examination Committee(s) | Preecha Kamronrithisorn; |
| Scholarship Donor(s) | The Government of Japan; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |
