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A waste water effluent of 620 lit/s with BOD =45 mg/lit, DO=3.0 mg/lit and temperature $24^o$C enters a river where the flow is 27m3/sec,

BOD =3.0 mg/lit , DO=8.2 mg/lit and temperature 18oC. K1 of waste is 0.10 per day at $20^o$C. The velocity of water in the river downstream is 0.18 m/sec and depth of 1.2m. Determine the following after mixing of waste water with the river water. i)Combined discharge. Ii) BOD. Iii) DO. iv) Temperature.

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