Selection of an Appropriate Interpolation Method for Rainfall Data In Central Nigeria

Interpolation technique can be used to establish the rainfall data at the location of interest from available data. There are many interpolation methods in use with various limitations and likelihood of errors. This study applied five interpolation methods to existing rainfall data in central Nigeria to determine the most appropriate method that returned the best prediction of rainfall at an ungauged site. The methods include the inverse distance wieight method and four variants of universal kriging (spherical,exponential,gaussian and power). The Guassian model of Kriging yielded the least root mean square error for monthly rainfall interpolation and is therefore recommended for use on monthly rainfall data in Nigeria.Key Words: Rainfall, Boxplots, Kriging, Interpolation,Variograms, Gaussia

A RAPID HEALTH IMPACT ASSESSMENT OF THE UNIVERSITY OF ILORIN DAM

Many Dams have been constructed in different parts of the world and for different purposes. While these dams have in most cases served the reason for their construction, the resultant environmental impact have been a subject of concern. The creation of a reservoir not only changes the ecology and hydrology of the environment, the lives of nearby residents is also affected. This study assessed the impact of the University of Ilorin Dam on the health condition of the University community. The Dam was built for the main purpose of water supply to university community. Data on the water related disease reported and documented at the university clinic was obtained to cover pre and post construction period while the perception and behavioral pattern of the community as related to water and sanitation was studied with the help of a structured questionnaire. The chi-squared test was applied to establish that a relationship do exist between the dam construction and the occurrence of some diseases especially Malaria. The study have also shown that the dam imposes no significant negative health impact on the university community. http://dx.doi.org/10.4314/njt.v36i1.28

Evaluation of Municipal Solid Waste Management System and Willingness-To-Pay for its Improvements in Ilorin, Kwara State, Nigeria

This paper reports the evaluation of households’ usage of the current solid waste management system (SWMS) within the city of Ilorin, central Nigeria and investigates the determinants of household’s willingness-to-Pay (WTP) for its improvement. Data was collected with the aid of a structured questionnaire administered to households within four neighbourhoods that represent the major subdivisions in the metropolis. The multiple regression model was applied in explaining household’s usage of the current system and WTP.The study found that 36% and 64% respectively of the households were unsatisfied and moderately satisfied with the current waste management system.The combined effect of household’s demographic profiles, geometric profile and position of waste management facility gave a significant fitted model to show the relationship between household’s willingness to pay and the considered predictors.http://dx.doi.org/10.4314/njt.v34i4.2

Pragmatic approach to the combination and selection of tanks for water distribution pipe network based on pressure simulation

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