The ABC Tannery has asked you to assist them in preparations to file for a NPDES permit to discharge wastewater into the XYZ River. The Dept. of Natural Resources water quality criterion for the XYZ River is 5.00 mg/L of DO. They have asked you the following questions: What is the critical DO and where (at what distance) downstream does it occur? They have provided you with the following data. The flow data pertain to the 7-year, 10-day low flow at the tannery.
|
Parameter
|
ABC wastewater
|
XYZ River
|
|
Flow, m3/s
|
1.148
|
8.222
|
|
BOD5 at 20oC, mg/L
|
90.00
|
N/A
|
|
BODult at 20oC, mg/L
|
N/A
|
7.66
|
|
DO, mg/L
|
1.00
|
6.00
|
|
Temperature, oC
|
17.5
|
15.0
|
|
k at 20oC, 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
|
Submit a copy of your spreadsheet solution with a graph showing your results on Moodle. No hard copy will be accepted. Make sure to useappropriate significant digits.