04012nam a2200409 4500 20260818095307.0 th eng .b11633086 AIT Thesis no.WM-96-13 Surachai Laikarnchanapaiboon Effects of Pasak reservoir on the flood levels of the lower Chao Phraya river from Ayutthaya to Bangkok Bangkok : Asian Institute of Technology, 1997 77 leaves Thesis ; no. WM-96-13 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, 1996 The flood problems in the lower Chao Phraya river basin causes severe damages in the lower Chao Phraya flood plain and especially in Bangkok. The Pasak reservoir is constructed on the Pasak river for multipurpose including flood control, irrigation and water supply. The Pasak reservoir regulates the flood inflow and release the stored flood volume into the Pasak river before joining with the Chao Phraya river at Ayutthaya province. In this study, two mathematical models namely the HEC-5 model for reservoir flood control and water conservation system and the MIKE 11 hydrodynamic model for flood routing are used. The HEC-5 model is applied to route the design flood inflows of 100, 500 and 1,000 year return periods to downstream of the Pasak river. The MIKE-11 model is applied to route the release from the Pasak dam along the Pasak river to its confluence with the Chao Phraya river at Ayutthaya and from Ayutthaya along the Chao Phraya river through Bangkok to the river mouth at Fort Chula. The flood hydrographs at various station along both rivers are computed for the cases with and without the Pasak reservoir. The MIKE-11 model was calibrated successfully using the hourly flood data from 10 Sep to 30 Nov, 1987 and verified using the hourly flood data from 1 to 30 Nov, 1995. The results of model applications shown that the flood peak levels in the Pasak river are decreased by 0.27 m (at station S26) to 0.55 m (at station S9) along the river for the 500 year return period flood with a delay in the time to peak from 8-24 hours, and by 0.35 m (at station S26) to 0.68 m (at station S9) for the 1,000 year return period flood and the time delay in flood peak is about 1 day. For the Chao Phraya river, the effects of the Pasak reservoir on the flood peak levels is negligible due to small flood volume of the Pasak river (1000 year return period) compared to that of the Chao Phraya river of 20 year return period. However, there is a significant delay in the time to peak of 1 to 2 day due to the routing effect of the Pasak reservoir. Pasak Reservoir Water levels Chao Phraya River Tawatchai Tingsanchali, Chairperson Naritaka, Kubo, Examination committee Harumichi, Kyotoh, Examination committee Asian Institute of Technology. Thesis ; no. WM-96-13 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B14955 .b11633086 mnait y 240520 0 970908 m a y 0 mnait mnait mnarc 20 40 Barcode : 30050120591853 CREATED : 1996-11-04 RECORD # : i1199888x LPATRON : 1024114 LCHKIN : 2013-12-18 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 14 TOT RENEW : 9 Barcode : 30050120591846 CREATED : 1996-11-04 RECORD # : i1199891x LPATRON : 1022226 LCHKIN : 2012-11-07 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 18 TOT RENEW : 12 Barcode : 30050160043930 CREATED : 2016-11-03 RECORD # : i12891678 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 35271 35271 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.WM-96-13 30050120591853 2026-08-18 09:53:07 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.WM-96-13 30050120591846 2026-08-18 09:53:07 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.WM-96-13 30050160043930 2026-08-18 09:53:07 1 2026-08-18 40