| Author | Sriramany, Sritharan |
| Call Number | AIT Thesis no.IR-92-06 |
| Subject(s) | Irrigation scheduling--Data processing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. IR-92-06 |
| Abstract | An integrated computer model (RIW AP) was developed to calculate the crop water
requirements and canal delivery schedules of irrigation systems. The model is interactive,
user friendly, and can be operated on real time basis.
Model RIW AP can be applied at the end of each irrigation week to find the
irrigation requirements and canal delivery schedules for the following week. Climatic,
field, crop, and canal data were input interactively through the program INPUT. Weekly
water requirements of paddy was estimated by program PADDY using water balance
approach. Water requirement of sugarcane and the week of irrigation was found out by
program SUGAR based on soil moisture profiles simulated by solving the governing
equation for one dimensional flow using finite difference approach. Water uptake by
sugarcane has been computed using Feddes sink function. Weekly rainfall was predicted
using Leaky law based on historical rainfall record. Programs SRA and EXRAIN were
used for predicting the rainfall. Canal flow rates and delivery schedules were computed
by the program SCHED. Program RIW AP combined all these programs appropriately and
provided the user interface through menus.
The developed model RIW AP was tested in the Tha Maka sub project of the Mae Klong
irrigation project in Thailand and the results were compared with the existing
model W ASAM and actual practice.
Amount of irrigation estimated by RIW AP was lower compared to W ASAM.
However the actual irrigation applied was found to be lower than those suggested by both
RIW AP and W ASAM. Continuous irrigation, as proposed by W ASAM, practiced in the
project has resulted in low flow rates and higher losses and thereby in low efficiency. To
rectify this, higher flow rates and rotational delivery schedules were proposed by this
study. In addition some canals were found to be under designed, if optimum water has
to be applied to the corresponding command area throughout the season. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. IR-92-06 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Irrigation Engineering and Management (IR) |
| Chairperson(s) | Murty, V.V.N.; |
| Examination Committee(s) | Harboe, Ricardo;Tran, Thuc; |
| Scholarship Donor(s) | Government of Norway; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |