a developing nation. As there were no declared client preferences, a PWSS similar to the pump, header tank and gravity fed system already utilised by the Port Resolution Yacht Club was considered to be the most appropriate option for the PRCP.
The major design flaw of the proposed PWSS is the need for a header tank stand. It was identified late in the project that there is no appropriate location within the Port Resolution community to provide the site with a pressure head of ten metres. This is one of the fundamental design requirements of the PWSS. In the proposed design, the height of the header tank is eight metres tall and the tank would weigh more than 23 tonnes. While construction of such a stand is entirely feasible in a developed nation, it is not realistic in the context of the PRCP. After identifying this design issue, alternative solutions are discussed in 4.5 Possible Further Improvements.
Nonetheless, the proposed system has been engineered to meet the design capacity and requirements of the proposed ecotourism resort. It is believed that the PWSS is culturally acceptable while meeting the requirements of both the Port Resolution community and visitors.
The simple engineering design reduces the maintenance requirements of the system. An advantage of the proposed system is that individuals in the community already have knowledge regarding the setup and maintenance requirements for pumps. The submersible pump would have the highest maintenance requirements of the system but, overall, the PWSS has minimal maintenance. Long term, the gravity fed system will have require less attention than the pump as it does not have moving parts that need monitoring and the polyethylene pipe is durable.
The pump selection process ensures that an efficient, appropriate pump is selected to meet the desired pump characteristics of available head of 28 metres and pumping rate of 4.14 m3/h. The Grundfos SP 5A-8 pump is able to sufficiently perform this task. Hence, the selected pump is cost-effective for the system.
The engineering design of the system enables the site to have water storage capabilities that will allow the ecotourism resort to function if the pump fails. It is believed that the community will be able to fix any problems that arise with the submersible pump. Furthermore, the header tank is able to supply the site with a pressure head of at least ten metres and this will provide the site with sufficient pressure. These unrealistic design parameters used to design the PWSS reflect the no declared client preferences for the system and alternate solutions are considered as a result.
The two greatest challenges for the construction of the PWSS is the drilling of a new bore hole and the installation of the header tank and gravity fed system. The DGMWR section of the Vanuatu Government will have to be approached to drill a new bore hole and the appropriate documentation will have to be completed for the application. The new...