| Author | Tran Thi Trieu |
| Call Number | AIT Thesis no.WM-03-07 |
| Subject(s) | Water balance (Hydrology)--Vietnam
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | Water availability for irrigation, especially during the dry season, is a major concern in
tropical countries like Vietnam. It is on this premise that a study in a particular catchment in
Daklak province in Vietnam was conducted to assess if the irrigation requirements of the
cultivated areas in the catchment can be satisfied. Although some reservoirs exist in the
catchment, their storage capacity is however not enough to provide the crop water demands
during the dry season. This study is therefore aimed to make a water balance to assess if
available water supply can satisfy the water demands from rice and coffee farms in the
catchment. To meet this objective, some existing models were applied to evaluate water
inflows to and outflows from the reservoir during the cropping season. Specifically, the
CROPW AT model was used to estimate irrigation requirement of rice and coffee. A
streamflow generation technique was applied to estimate inflow using some rainfall-runoff
regression analysis. The weather and climatic data used for the analysis were taken from
existing records for the period from 1977 to 2000. The estimated water supply and demand
were then used as inputs to the MIKE BASIN model which evaluates if there is surplus or
shortage of water as far as the irrigation requirements of the 2 crops are concerned.
It was found from the water balance analysis that there was shortage of water during most
months of the year (i.e. November. to April) if the 1402 ha and 67 49 ha rice and coffee crops,
respectively, will be irrigated. This period which has shortage of water accounts to 101 months
out of the 288 months for the whole simulation period in Ea Chukap and Ea Nao sub-catchment.
The reservoirs satisfy the water irrigation requirement for only part of irrigable.
However, when the area reduction concept was applied, it was found that by decreasing the
area by 30% (that is from 6794 to 4930 ha of coffee and from 1042 to 701 ha of rice) then
limited supply of water during the dry season can satisfy the irrigation demand for this area.
Although the current area of coffee plantation can not be reduced, it was however estimated
that the available water supply can be used for 70% of the area which means that only this
part of the whole area can be covered by irrigation water. |
| Year | 2004 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Clemente, Roberto S. |
| Examination Committee(s) | Gupta, Ashim Das ;Babel, Mukand S. |
| Scholarship Donor(s) | DANIDA |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2004 |