DefinePK

Abstract

It is crystal clear from the history of human beings that water is one of the vital needs for development ofsociety. Water is utilized, at domestic level in houses, at commercial level in mosque, hospitals, schools, colleges etc.As supply of fresh water is important, the disposal of waste water is also a determining need for sustainable development of society. The disposed-off waste water is needed to be handled effectively and wisely in order to avoid any damage to the ecosystem. As far, sewerage system design is concerned, the designers are preparing these designs by adopting some predefined key parameters of ground slope, for choosing diameter of sewer and calculate the corresponding velocity of flow from design flow. In this study, the hydraulic design of two housing societies, 1st located in Multan and 2nd in Islamabad, is prepared by using a design method from literature and is then compared, to the hydraulic designs prepared commercially, in terms of hydraulic parameters. According to obtained results, in Multan, larger diameters of sewers and greater slope i.e. greater excavation is observed as compared design prepared by ourselves. The hydraulic sheets reflects the observed difference of 5.44m in excavation level, from 1st manhole to last manhole, in our hydraulic model. While the excavation of ground from 1st to last manhole in commercial design observed is 7.72m. Therefore, it can be clearly observed that the hydraulic design prepared by ourselves is more economical as compared to the commercial one for site, selected in Multan. However for Islamabad, minor differences in hydraulic designs are observed. These minor variations includes only difference of earth cover of 0.5m above each manhole. The overall difference observed in excavation of ground level from of 1st manhole to last manhole, in Islamabad commercial design, is of 0.03m with respect to our hydraulic design.