04339nas|a2200421 i 4500 20260818084631.0 951012s1994 th u m rtt 00| a1eng d .b1016019x AIT Thesis no. IR-93-03 Diente, Antonio C. Computer simulation of water allocation in the Lambayong River Irrigation System in Mindanao, Philippines Bangkok : Asian Institute of Technology, 1994 123 leaves Thesis ; no. IR-93-03 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering Thesis (M. Eng.) - Asian Institute of Technology, 1994 A 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. Water Philippines Mindanao Distribution Murty, V.V.N., Chairperson Harboe, Ricardo, Examination Committee Kono, Yasuyuki, Examination Committee Tran Thuc, Examination Committee Government of Spain, Scholarship Donor Asian Institute of Technology. Thesis ; no. IR-93-03 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16040 .b1016019x mnait u 240411 2 951012 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050003076527 CREATED : 1995-10-13 RECORD # : i10189804 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003076519 CREATED : 1995-10-13 RECORD # : i10189816 LPATRON : 1014190 LCHKIN : 2002-08-15 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 1 Barcode : 30050160071972 CREATED : 2016-04-28 RECORD # : i12962739 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 21257 21257 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. IR-93-03 30050003076527 2026-08-18 08:46:31 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. IR-93-03 30050003076519 2026-08-18 08:46:31 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. IR-93-03 30050160071972 2026-08-18 08:46:31 1 2026-08-18 40