What is critical do and where downstream does it occur

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Reference no: EM131012376

The A tannery asked for assistance in prep for NPDES permits to discharge wastewater into X river.

Water quality criterion for X river is 5.00 mg/L of DO.

What is critical DO and where (at what distance) downstream does it occur?

Data is provided below. Flow data pertain to the 7-year, 10-day low flow at the tannery.

Please show calculations and steps in how to set up sag curve with given data.

Parameter	A wastewater	X River
Flow, m³/s	1.148	8.222
BOD₅ at 20^oC, mg/L	90.00	N/A
BOD_ult at 20^oC, mg/L	N/A	7.66
DO, mg/L	1.00	6.00
Temperature, ^oC	17.5	15.0
k at 20^oC, d^-1	0.3685	N/A
Speed, m/s	N/A	0.300
Depth, m	N/A	2.92
Bed-activity coefficient	N/A	0.100

Reference no: EM131012376

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