Analysis of Phosphorus Pollutographs in Kojour Watershed

Soil erosion will cause nutrients washes out, soil depletion and water pollution. Therefore, information on nutrient loss variations and its transport in surface water is very important. The present study was conducted to analyze phosphorus losses in 5 rainfall events and the relationship between the hydrographs and the phosphorus pollutographs in Kojour watershed. Results showed that maximum and minimum phosphorus loss were 32126 and 6707 g, respectively with an average value of 2620 g. The results of pollutographs were also showed that most of the pollutographs are in advanced and eveloped stages and rating loops also recognized as clockwise type. The results ultimately approved the necessity of further detailed studies in storm scale and different time bases.