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Hello, I am using QUAL2K to model BOD, T-N, and T-P in a river. The entire section is 600 meters long. I encounter an issue where the BOD should increase due to a Diffuse source, but applying Diffuse sources results in an error message stating "SOD iterations exceeded." I have already entered the field data. Could you help me identify what might be causing this problem? Also, given that the river is only 600 meters long, resulting in a short retention time, I would like to know if these factors could naturally decrease due to natural attenuation. Thank you.