Water concentration time series data were described by a first order kinetics i-FTW model that generates an FTW performance parameter: FTW apparent uptake velocity (vf). A comprehensive literature search of i-FTW studies was conducted to collect total phosphorus (TP) and total nitrogen (TN) concentrations data. The vf values were calculated from these studies and estimated using a bootstrap percentile method. The best estimation of median and expected range with 95% confidence interval of the vf were 0.048 (0.018-0.059) and 0.027 (0.016-0.040) m/day for TP and TN, respectively. The goodness of fit (R2) of the i-FTW model on water concentration time series data of the i-FTW experiments was 0.92 卤 0.30 for TP and 0.86 卤 0.38 for TN data (mean 卤 SD). This model provides insights into compartmental treatments of i-FTW systems and serves as a preliminary tool to select extent of FTW coverage when designing an i-FTW system. Further research to resolve limitations of model application is suggested.