000 04339nas|a2200421 i 4500
005 20260818084631.0
008 951012s1994 th u m rtt 00| a1eng d
035 _a.b1016019x
099 9 _aAIT Thesis no. IR-93-03
100 1 _aDiente, Antonio C.
245 1 0 _aComputer simulation of water allocation in the Lambayong River Irrigation System in Mindanao, Philippines
260 _aBangkok :
_bAsian Institute of Technology,
_c1994
300 _a123 leaves
490 1 _aThesis ;
_vno. IR-93-03
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering
502 _aThesis (M. Eng.) - Asian Institute of Technology, 1994
520 _aA computer model RIW AP (Real Time Irrigation Water Allocation Program) for water allocations in large irrigation system has been applied to simulate the water requirement of lowland paddy and upland crop maize in an irrigation system in the Philippines. The model accounts for all significant climatic and soil factors which influence the crop water requirement. The model has been modified to conform with the area's conditions and farming practices. The model was adjusted to address the present cropping pattern in the area. Dry season rainfall records for the past forty years were analyzed on weekly basis by the concept of conditional probability. For this purpose, a computer program using Markov Chain was purposely developed to generate the probable rainfall for each of the following week of the season. The model adopts the water balance method for the calculation of water requirement for lowland paddy, and soil moisture simulation approach for the upland crop maize. The model calculates the crop water requirement of the next following week by assuming the climatic values of the preceeding week except rainfall which will be generated by the model. After the end of each irrigation week, the model updates the climatic variables using the actual values that has transpired during the week. Comparison of model results were undertaken between this model and the one which was used by an irrigation system in Thailand called W ASAM (Water Allocation Scheduling and Monitoring Program). Results of both models were compared with the values gathered from the systems office. For the paddy crop, the two models showed a similar results. However, WASAM displays unfavorable results when applied in the upland crop maize. It suggests a continuous weekly irrigation which amounts to high water requirement, while the expanded model RIW AP exhibits a reasonable results. The discrepancy of the results is credited to WASAM's similar water requirement calculation procedure, both for upland crop and lowland paddy. While that for RIW AP which adopts the soil moisture simulation approach for upland crop. The extent of area that can be supplied by the present conveyance facilities under consideration as suggested by RIW AP is only about 70% of the total designed area which closely coincides with the actual scenario.
650 0 _aWater
_xPhilippines
_xMindanao
_xDistribution
700 1 _aMurty, V.V.N.,
_eChairperson
700 1 _aHarboe, Ricardo,
_eExamination Committee
700 1 _aKono, Yasuyuki,
_eExamination Committee
700 1 _aTran Thuc,
_eExamination Committee
710 2 _aGovernment of Spain,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. IR-93-03
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B16040
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