02948nas a2200445 4500 20260818145356.0 011298s1985 th r 000| 0eng d .b10399197 AIT Thesis no.EV-85-15 ll Number: AIT Thesis no.EV-85 Kreeta Sroikeeree Least cost design of drainage systems with three-dimensional state variables Bangkok : Asian Institute of Technology, 1985 51, (39) p. Thesis ; no. EV-85-15 A thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1985 Drainage systems can be efficiently designed for minimum cost by Dynamic Programing. Present models generally use a one-dimensional state variable with the pipe level as parameter. Although the theoretical need for at least a two-dimensional state variable is recognised, more dimensional state variables are still considered as impracticable due to computational requirements. In this study one-, two-, and three-dimensional models were developed. The parameters are the pipe elevation, the pipe diameter, and the time of flow as in the Rational Method. The model has been implemented on a IBM personal computer. Three test examples show the operationability of the developed program. It has been found for the test examples that introducing the time of flow into the state variable reduces the least cost between 0 and 7.2%. Depending on topography, introducing the diameter in some certain cases reduces the least cost more than 17% {u2022} Flocculation Orth, H.M., Chairperson Lohani, B.N., Examination Committee Huynh, Ngoc Phien, Examination Committee Chongrak Polprasert, Examination Committee US-ASEAN, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-85-15 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B20014 .b10399197 mnait x 240329 2 951012 m a x 0 mnait mnait mnarc 22 40 20 Barcode : 30050120804454 CREATED : 2014-05-28 RECORD # : i12804356 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120224323 CREATED : 2016-09-05 RECORD # : i12972678 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121074289 CREATED : 2023-03-04 RECORD # : i13441693 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 69003 69003 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-85-15 30050120804454 2026-08-18 14:53:56 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-85-15 30050120224323 2026-08-18 14:53:56 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-85-15 30050121074289 2026-08-18 14:53:56 1 2026-08-18 20