GIS in Water Supply Network Maintenance in Tarkwa, South Western Ghana

Michael Soakodan Aduah ； Saviour Mantey ； Naa Dedei Tagoe

《Research Journal of Environmental and Earth Sciences》 3卷6期 (2011/11) Pp. 737-744

並列摘要

Developing systems to manage and maintain water supply networks is an important aspect of the operations of water companies. This study uses GIS to investigate the water supply network of a section of Tarkwa Municipality in South Western Ghana. The objective is to create a geodatabase that supports improved operations and performance and to determine costs of asset replacement. Digital maps of the study area were re-projected to the WGS84 UTM Zone 30 North projection. Analogue maps of the mains and lateral pipelines were scanned and geo-referenced to this projection. The pipelines and valves were then manually digitized, their attribute tables created and a geodatabase model developed. The analysis indicates that more than half of the network is over-aged. Also of the 11 km of pipelines, more than 76% was laid in 1975 and 1978. AC and PVC pipes laid in 1975 and 1978 comprise 29 and 47% respectively while the rest of the study area is covered by AC and PVC pipes laid in 1987. This study also observed that the length of AC pipes have consistently reduced since 1975. The study has further demonstrated the suitability of GIS techniques in studying water distribution networks. The system developed three scenarios that can support the design of long term expansion and replacement action plans. The study also provides detailed spatially referenced information on pipelines and the associated cost of replacement as they reach the designed lifespan.

並列關鍵字

Digital maps ； geodatabase ； Ghana ； GIS ； pipelines ； Tarkwa