TY  - SER
AU  - Somjai Vatanavanichkul
AU  - Orth,H.M
AU  - Lohani, B.N.
AU  - Kanchit Malaivongs,
ED  - Government of the Netherlands,
TI  - Economic effects of pressure conditions in a looped water distribution system
T2  - Thesis
PY  - 1982///
CY  - Bangkok
PB  - Asian Institute of Technology
KW  - Water-supply engineering
KW  - Costs
KW  - Water
KW  - Distribution
KW  - Computer programs
N1  - 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
N2  - 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
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B21194
ER  -