Rainstorm and sediment yield characteristics at Ibadan

Ibadan experiences violent, tropical convectional storms of small areal extent. Hence, it is common observation that whilst very heavy rainfall can occur in one part of the city, another part can be totally dry. The annual average rainfall among stations in Ibadan do not differ significantly.The characteristics of the storms in Ibadan are not well documented. This study was carried out to evaluate and compute some of the characteristics of the Ibadan storm from the normal conventional rainfall autographs.It was found that there are 30 storms in a year accounting for over 70 % of total annual rainfall. It was also found that whilst rain may fall continuously for one or two hours in Ibadan, most of it is concentrated in only 20 minutes of fall which often coincides with the middle portion of the rain period.