Assessment of runoff potential for disaster risk reduction using geospatial technology in Opa watershed, Southwestern Nigeria

Flood prediction is very important in land and water resources management. Many flood disasters could be mitigated with adequate preparedness especially urban watershed. This study assessed the runoff potential of Opa watershed Southwest Nigeria using remote sensing Soil Conservation Service or SCS curve number (CN) techniques. The 2007 NigSat image year was classified into different cover classes combined its hydrological soil groups to determine each sub-watershed. sub-watershed low considered have lower while one higher potential. CN also used estimate maximum retention, (S) runoff, (Q) for a rainfall event 2-year return period weighted sub-watersheds highest lowest showed that 9 average value 85.93 has (5.53 mm) vegetated 10 69.46 (0.34 mm). concluded available geospatial technology appropriate hydrologic assessment techniques constitute an effective method disaster risk reduction sustainable