The purpose of this study is to develop a simplified mathematical model to simulate suspended solids and total phosphorus concentrations in a wetland or detention pond.Field data collected from a wet detention pond during storms were used to demonstrate the application of this model.Favorable agreements between the model results and data were achieved.The ratio of average outlet method and summary of loads method were used to quantify the removal efficiency of pollutants,reflecting the efficiencies are very close.The results of this study can be used for nonpoint source pollution control,wastewater treatment or best management practices (BMPs) through the wetland.