| Author | Kalsim, Dedi Kusnadi |
| Call Number | AIT Thesis no. WA-79-9 |
| Subject(s) | Reservoirs--Thailand, Northeastern--Statistical methods
|
| 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 | The stochastic technique for computing the reliability of reservoir using Gould's method modified by JOY< C,S, and T.A.Mc MAHON (1972) is
applied to two small reservoirs( namely Huai Pradu and Nong Kae Dam with the storage capacity of 2<804,375 and 11
275,680 cubic meter, respectively. Inflows and releases are considered on monthly basis, and monthly
releases are considered constant every year based on irrigation demand. Two cropping pattern are introduced namely cropping pattern I (i.e. rice in wet season and dry season) and cropping pattern II (i,e. rice in wet season and peanut in dry season).
The maximum allowable time shortage of water for rice and peanut are 5.4 days (time-based probability of failure 18%) and 2.4 days (time-based
probability of failure 8%)< respectively. The non-exceedance probability
of monthly effective rainfall of 0.20 for October and 0.10 for other months are used to compute the net irrigation demand. The assumed values for
computing seasonal probabilities of failure and spilling are; total irrigati on efficiency for rice and peanut are 50% and 60% respectively, seepage through the bottom of reservoir is 90 mm/month and pan coefficient is 0.70. Based on the above assumptions and criteria of allowable maximum time
shortage of water, the acreage of crop that can be considered safely to be irrigated for Huai Pradu reservoir are; 320 Ha rice in wet season and 40 Ha rice in dry season for cropping pattern I, 320 Ha rice and 100 Ha peanut or 260 Ha rice and 180 Ha peanut for cropping pattern II; and for Nong Kae Dam; 260 Ha rice in wet season and 20 Ha rice in dry season for cropping
pattern I, 260 Ha rice and 50 Ha peanut or 240 Ha rice and 60 Ha peanut for cropping pattern II. The selection of cropping pattern II should be based on economics term expressed in net income (in term of money) which will be received by farmer for each alternatives of cropping.
The sensitivity of the model to the runoff coefficient and the
non-exceedance probability of monthly effective rainfall are also assessed in this study.
Prediction of acreage of crop that can be considered safely to be irrigated using the model depends on the probability of non-exceedance of monthly effective rainfall that will be selected; prediction of runoff
coefficient; the probability of failure in terms of time, occurrence and quantity bases that can be considered to be safe; the prediction of total
irrigation efficiency and prediction of evaporation and seepage from reservoir.
|
| Year | 1980 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Eggers, Helmut |
| Examination Committee(s) | Selvalingam, Selvadore ;Apichart Anukularmphai ;I, Fude |
| Scholarship Donor(s) | Regional Economic Development, U.S.A. |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1980 |