I am developing a research methodology on surface water pollution, the latest and more preferable type of model used to estimate nutrient, waste either suspended and dissolved pollutants are released from urban (domestic waste, industry, organization and agricultural waste) all these waste sources are releasing into the lake using tributary rivers. Therefore anyone who can recommend me the type of models used to estimate the following pollution indicators?
1. Nutrient load from non-point pollution sources (Phosphate, nitrate, sulfate, etc)
2. Plastic material load
3. Macroinvertebrate abundance, sampling and their application as a pollution indicator
4. which type of research design more appropriate to determine riverine macrophytes related to pollution level?
I thank you for your suggestion and answers in advance!!!!