keywords: Excel Optimization Solver, Normal distribution, Goodness of fit test, IDF models, Pearson Type 3 distributions, Osogbo.
The type and velocity of water flow resulting from rainfall activities in a certain catchment are constant variables in hydraulic engineering systems. The recent flooding experienced in Osogbo requires adequate frequency analysis of rainfall record that will aid the design of drainages to mitigate the flooding. The Nigerian Meteorological Agency ..............................................................................................................................................................................................................