02486nas a2200253   450000500170000000800410001703500150005810000240007324500810009726000520017830000100023049000270024050001640026750200580043152014190048965000240190865000130193270000310194570000360197670000390201271000570205181000590210885600650216720260817163539.0011298s1986    th      r     000| 0eng d  a.b100988111 aMamoon, Abdullah Al10aAssessment of effectivity of design models for sewerage and drainage systems  aBangkok :bAsian Institute of Technology,c1986  a78 p.1 aThesis ;vno. EV-86-11  aA research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1986  aThe efficiency of computer based modelling is assessed by testing  the Dynamic programming model developed at AIT by SROIKEEREE (1985) on  microcomputers. considering elevation. pipe diameter and time of flow as  state variables.  The model is applied to some large and small real networks  simulating actual field conditions. Capital cost savings of 2.10 - 7.7 %  were found by using model design rather than convetiona1 design.  Inclusion of time of flow as a state variable reduced cost to about  1 % more than compared to those from models considering only elevation  and diameter. Behavior of the model seems to be dependent mostly on  topographic conditions. Introducing the diameter into the state  variables reduced least-cost by about 17 % in an artificial network.  The model is capable of designing storm. sanitary and combined  systems effectively and its operation does not require much skill. One  important feature of this model is the use of microcomputers which could  be readily available specially in developing countries and can be easily  installed in design offices engaged in sewer system design. Besides  this. the model also showed sensitivity to maximum and minimum velocity.  sewer cover and cost functions etc.  Results obtained from this study demonstrate the great likelihood  of the acceptance of model based design by sewerage and drainage  engineers instead of conventional design. 0aDynamic programming 0aDrainage1 aOrth, H.M.,eChairperson  1 aI, Fude,eExamination Committee1 aHanaki, K.,eExamination Committee2 aThe Royal Netherlands Government,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-86-11  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B19636