Morphometric Analysis of Ogunpa and Ogbere Drainage Basins, Ibadan, Nigeria

Abstract

The paper analysed the morphometric parameters of Ogbere and Ogunpa drainage basins located on basement complex rock in Southwestern Nigeria. Data used were generated from topographical map of Ibadan Northeast on scale 1:25,000 published by Federal Survey of Nigeria (1975). Result obtained indicated that studied basins exhibits high spatial variation in their morphometric properties. The study further revealed that morphometric properties of Ogunpa drainage basin are likely to induce high magnitude flood compared to morphometric properties of Ogbere drainage basin. The study thus suggested a number of management practices that can be used in reducing rates of environmental degradation in the basins.

A Comparative Analysis of Drainage Morphometry on Hydrologic Characteristics of Kereke and Ukoghor Basins on Flood Vulnerability in Makurdi Town, Nigeria

“…Though, Ukoghor is smaller in size, the basin has recorded more flood events in the city than Kereke drainage basin, which is larger in size. The reason for this as observed by [2] in their study of Ogbere and Ogunpa drainage basins can be traced to the difference in basin length. Kereke drainage basin is larger in size, a factor which affect its length (the larger the basin, the longer its length).…”

“…The choice of morphometric variables that were examined in this study was based on the result obtained from previous studies, which have been found to correlate highly with peak discharge, runoff volumes and sediment delivery [22]; [11]; [23]; [10]; [24]; [5] cited in: [2]. In all, eleven (11) morphometric variables (broadly categorized into three (3) vis; area, linear and relief morphometrics) as suggested by [2] were examined (Table 2 and 3).…”

“…In all, eleven (11) morphometric variables (broadly categorized into three (3) vis; area, linear and relief morphometrics) as suggested by [2] were examined (Table 2 and 3). The procedure used in deriving each of the variables is equally shown in table 1.…”

“…This is because, the larger the basin, the greater the volume of rainfall it intercepts, and the higher the peak discharge that result ( [8]; [9]; [10]; [3]; [4]). Another reason for the high positive correlation between basin area and discharge is the fact that basin area is also highly correlated with some of the other catchment morphometric characteristics which influence runoff, such as, basin length and stream length ( [11]; [12]; [3]; [5] cited in [2]). However, other catchment morphometric parameters such as relief, shape and length also influence basin discharge pattern strongly.…”

“…These parameters affect catchment stream flow pattern through their influence on concentration time [1] cited [2]. These landscape parameters are significant because stream flow can be expressed as a general function of geomorphology of a watershed.…”