03417nas a2200433 4500 20260818094557.0 271098s1982 th r 000| 0eng d .b10221840 AIT Thesis no.EV-82-16 Somjai Vatanavanichkul Economic effects of pressure conditions in a looped water distribution system Bangkok : Asian Institute of Technology, 1982 100 p. Thesis ; no. EV-82-16 A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1982 The study deals with the comparison between the costs of different pumping station arrangements and minimum service pressure variations of water distribution systems. The shortest path concept for flows in combination with a linear optimization model was used to determine the minimum cost of the alternatives in comparison. The model was applied to flat plain and hilly topography networks. A sensitivity analysis was carried out to determine the effects of cost functions of two different countries, a systematic variation of pumping station investment cost and of the determination of the hydraulic gradient by Prandtl-Colebrook or Hazen-William formula. The results indicated that the optimal designs is very sensitive to the relationship of piping and pumping costs. Total system costs increase almost linearly with the increase of the minimum service pressure as for the increasing service may be compensated by an increased pressure at the supply source. The optimal solutions were not very sensitive to changing the investment cost of pumping station and different determinations of hydraulic gradients. The Linear Optimization Technique was compared in one case with the Hardy Cross Technique. The first technique gave a more economical system than the second. Moreover, the Linear Optimization method can cover all design criteria simultaneously while the Hardy Cross demands for checking several criteria after the design calculations. Water-supply engineering Costs Water Distribution Computer programs Orth, H.M, Chairperson Lohani, B.N. Co-Chairperson Kanchit Malaivongs, Examination Committee Government of the Netherlands, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-82-16 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B21194 .b10221840 mnait x 240902 2 951012 m a x 0 mnait mnait mnarc 22 40 20 Barcode : 30050120655575 CREATED : 2014-05-02 RECORD # : i12756891 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160084447 CREATED : 2016-04-05 RECORD # : i1296881x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121073943 CREATED : 2023-07-04 RECORD # : i13442284 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 33196 33196 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-82-16 30050120655575 2026-08-18 09:45:57 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-82-16 30050160084447 2026-08-18 09:45:57 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-82-16 30050121073943 2026-08-18 09:45:57 1 2026-08-18 20