Managing High Runoff Discharge in the Urbanized Basins of Asa River Catchment Area of Ilorin, Nigeria/GESTION DE DECHARGE DES EAUX DE RUISSELLEMENT DANS LES BASSINS URBANISES DE LA RIVIERE ASA DANS LA REGION D'ILORIN, AU NIGERIA

By Jimoh, H. I.; Iroye, K. A. | Canadian Social Science, August 31, 2010 | Go to article overview

Managing High Runoff Discharge in the Urbanized Basins of Asa River Catchment Area of Ilorin, Nigeria/GESTION DE DECHARGE DES EAUX DE RUISSELLEMENT DANS LES BASSINS URBANISES DE LA RIVIERE ASA DANS LA REGION D'ILORIN, AU NIGERIA


Jimoh, H. I., Iroye, K. A., Canadian Social Science


Abstract:

Incidence of flood has been on the increase in Ilorin for sometime; and this exemplifies the problem operating in most urban centres in Nigeria. Increase in runoff production in an urbanized catchment is a function, among other factors of to increase in percentage paved area brought about by deforestation activities and poor environmental attitude of the people. This study examines the relationship between runoff discharge and basin characteristics in Ilorin. Data used were collected directly from the field over a period of one calendar year. Rainfall data were collected in each basin using a standard rainguage of 20cm orifice while basin discharge was collected twice daily (8.00am and 6.30pm) using fabricated staff gauge graduated in centimeter. Basin morphometric attributes were computed from topographic map while landuse map was prepared from satellite imagery. Soil samples were collected and analysed for particle size distribution. The result obtained indicates that basin size and landuse have profound influence on the explanation of discharge in the basins. The study thus, recommends a number of options to efficient basin management in the city.

Keywords: Managing; High runoff discharge; Urbanized basin; Asa river catchment; Ilorin; Nigeria

Résumé: La fréquence des inondations est en augmentation dans la région d'Ilorin depuis un certain temps; et cela illustre le problème de la gestion des eaux dans la plupart des centres urbains au Nigeria. L'augmentation des inondations dans les bassins urbainisés est due au pourcentage accru des zones pavées et d'autres facteurs comme les activités de deforestation et une sensibilisation faible de la population à l'environnement. Cette étude examine la relation entre la décharge des eaux de ruissellement et les caractéristiques du bassin à Ilorin. Les données utilisées ont été recueillies directement sur le terrain pendant une année civile. Les données pluviométriques ont été collectées dans chaque bassin en utilisant l'ombromètre d'un orifice standardisé de 20cm et la décharge des eaux de bassin ont été recueillies deux fois par jour (à ShOO et à 18h30) à l'aide d'un jauge graduée en centimètres. Les attributs morphométriques de bassin ont été calculés à partir de la carte topographique et la carte de l'utilisation des terres a été préparée à partir des images satellites. Des échantillons de sol ont été prélevés et analysés pour la distribution granulométrique. Le résultat obtenu indique que la taille du bassin et de l'utilisation des terres ont une influence profonde sur la décharge des eaux dans les bassins. L'étude recommande donc un certain nombre d'options pour une gestion efficace des bassins dans la ville.

Mots-clés: Gestion; décharge de ruissellement; bassin urbanisé; bassin de la rivière Asa; llorín; Nigeria

1. INTRODUCTION

Problems associated with high runoff discharge have been a common occurrence in most parts of llorín for sometime (Enendu, 1981; Olaniran, 1983; Jimoh, 2000). This extreme hydro-climate event exemplifies the problem currently operating in most urban centres, not only in Nigeria but also in most developing countries of the world (Harun, 1982; Faniran, 1991); hence the need for studies relating to river catchment analysis. Previous studies conducted in humid temperate regions of Europe and America have identified catchment variables controlling streamflow pattern. These variables include, parameters of climate (Pitlick, 1994), landscape morphometry (Gregory and Walling, 1973), measures of soil characteristics (Freeze, 1980) and vegetation cover (Ward and Robinson, 1990). The contributing effect of these variables to catchment streamflow pattern, however depends partly on the scale. As the size of a basin increases, the variability in climate and physiography increases; thus, requiring more variables in predicting accurately the basin runoff patterns (Pitlick, 1994).

The little attention being paid to runoff studies in Nigeria is daily manifesting in water and water related problems being experienced in country (Faniran, 1991; Jimoh, 2003). …

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Managing High Runoff Discharge in the Urbanized Basins of Asa River Catchment Area of Ilorin, Nigeria/GESTION DE DECHARGE DES EAUX DE RUISSELLEMENT DANS LES BASSINS URBANISES DE LA RIVIERE ASA DANS LA REGION D'ILORIN, AU NIGERIA
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