Dear Seriba, Here is some ...
Published by Yoshimi Yoshida, Environmental Consultant at Yoshimi Yoshida Environmental Nutrition Consulting Service
Dear Seriba, Here is some additional info .. Pdf by US EPA. I feel your original question rather seems broad. You probably need to go a site specific requirement- I see you are located in Japan. Your target region / site in question is also in Japan? PDF. This is a thorough assessment of a constructed wetland. You see all the variables that are required to assess the wetland function - natural or not. Can be a useful source of data collection sample. http://water.epa.gov/type/wetlands/restore/upload/constructed-wetlands-design-manual.pdf