I fully agree with Eros Kaw. ...

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I fully agree with Eros Kaw. Further; I am not aware of the environmental regulations in place in Zimbabwe, but you need to find these and adhere to them (These should prohibit you from undertaking such work if you are not a professional in this field, as this work is reasonably "complex"). A good relatively "simple" approach is the use of an "oxygen sag model", this can be "built" using the Streeter-Phelps computations, these are fairly basic but you need reliable water quality data to build on. Good starting references are: "D Chapman (1996) Water Quality Assessments. Chapman & Hall" , "CN Sawyer (2003) Chemistry for Environmental Engineering. McGraw-Hill" and "RV Thoman (1987). Principles of Surface Water Quality Modeling and Control. Harper Collins Publisher Inc. I am based in South Africa and could offer you some assistance if you need it... (lluyaba@gmail.com)