GEOSPATIAL ANALYSIS OF THE DISTRIBUTION OF PRIMARY WATER PIPELINES IN LAGOS STATE (A CASE STUDY OF ALL LOCAL GOVERNMENT AREAS IN LAGOS STATE)
O. G. Omogunloye and O.O. Ayeni
Department of Surveying and Geoinformatics
University of Lagos, Akoka
Email: gabolushohan@yahoo.com
ABSTRACT
The problem of meeting growing demand for portable water in an ever growing city such as Lagos is complex and goes beyond just putting in place adequate water distribution facilities. Rather other factors remain very crucial in meeting daily water need of Lagosians. It is expected that in planning for an effective and sustainable water distribution system, the need for valuable information such as average daily consumption of water per person is a required planning data. The aim of this project was to use Geographic Information System (GIS) technology to integrate necessary planning information such as: available water resources, alternative water sources, resident population, land use and daily water need to carry out an effective water supply system. To achieve this aim, a number of set objectives were carefully examined from available planning standards. Of paramount importance among these objectives was to delineate the Lagos metropolis into existing local government areas, to determine water requirements (per heads) according to the World Health Organization standards, to document the existing water facility network in the Lagos metropolis/capacities and lastly to identify local government areas with acute water shortage. In search of these noble objectives, quite a number of methodological procedures were applied sequentially and logically. These were done using appropriate combination of hardware and software packages as well as spatial and attribute data sets. Both spatial and attribute data sets were collected in analogue formats and were converted to digital form leading to the creation of seamless GIS database. The GIS database comprises of spatial data (which are stored as digital maps) and attribute data (in form of additional information about details on the map). However, the content of the GIS database focus mainly on relevant information about water facilities in the metropolis as well as other baseline information. The information contained in the GIS database was subjected to rigorous analytical operations such as queries using Structured Query Language (SQL) available in GIS software, spatial geo processing, coordinate transformation, projection, cleaning/topology building and legend editing to produce the desired results. From this study, GIS has been used as a relevant tool to identify the available water distribution network and areas of acute water supply based on available water facilities and the World Health Organization (WHO) water requirements per heads in Lagos.
Keyword: GIS, Spatial, Attribute, data, Water, Facilities.