Homework 6 Solution

CE 394K.2 Spring 2008

 

Comparison of Watersheds

Constituent

Jollyville Watershed

Far West Watershed

Likelihood that the concentrations are the same for the two watersheds (p value) (all pooled t-tests)

Cadmium

0.776 0.175

0.51 0.007

 0.022

Chemical Oxygen Demand

63.94 9.762

47.62 7.98

 0.039

Copper

17.556 5.126

8.02 1.78

 0.006

Dissolved Phosphorus

0.093 0.032

0.083 0.011

 0.636

Fecal Coliform

3742 1987

22697 9430

 0.006

Fecal Streptococci

13687 5396

89325 24041

 <0.001

Ammonia

0.322 0.044

0.188 0.055

 0.004

Nitrite Plus Nitrate

0.473 0.135

0.346 0.064

 0.17

Lead

42.67 22.63

10.68 2.01

 0.027

Total Kjehldahl Nitrogen

0.982 0.134

0.785 0.116

 0.076

Total Phosphorus

0.219 0.034

0.179 0.022

 0.118

Total Suspended Solids

261.68 71.48

94.85 18.05

<0.001

Volatile Suspended Solids

32.097 8.082

17.63 2.82

 0.012

Zinc

133.063 45.54

66.84 10.85

 0.026

 


 

Jollyville Sand Filter Performance

Constituent

Jollyville Influent

Jollyville Effluent

Likelihood that the concentrations are the same (p value) (i.e., no reduction for this pollutant)

Cadmium

0.776 0.175

0.455 0.133

0.023 (pooled)

Chemical Oxygen Demand

63.94 9.762

29.19 5.087

3.63 E-05 (paired)

Copper

17.556 5.126

6.895 1.766

5.34 E-05 (paired)

Dissolved Phosphorus

0.093 0.032

0.063 0.107

0.185 (pooled)

Fecal Coliform

3742 1987

2502 1080

0.243 (paired)

Fecal Streptococci

13687 5396

7012 4041

0.0099 (paired)

Ammonia

0.322 0.044

0.097 0.020

3.45E-06 (paired)

Nitrite Plus Nitrate

0.473 0.135

0.807 0.194

0.005 (paired)

Lead

42.67 22.63

7.298 2.663

3.39E-05 (paired)

Total Kjehldahl Nitrogen

0.982 0.134

0.462 0.092

0.000745 (paired)

Total Phosphorus

0.219 0.034

0.131 0.053

0.00738 (paired)

Total Suspended Solids

261.68 71.48

25.35 14.75

0.00022 (paired)

Volatile Suspended Solids

32.097 8.082

1.184 0.338

1.44E-05 (pooled)

Zinc

133.063 45.54

28.116 10.165

5.31E-06 (paired)

 


 

Far West Extended Detention Basin Performance

Constituent

Far West Influent

Far West Effluent

Likelihood that the concentrations are the same (p value) (i.e., no reduction for this pollutant)

Cadmium

0.51 0.007

0.534 0.034

0.197 (pooled)

Chemical Oxygen Demand

47.62 7.98

51.50 16.76

0.736 (pooled)

Copper

8.02 1.78

8.80 2.39

0.667 (pooled)

Dissolved Phosphorus

0.083 0.011

0.101 0.013

0.092 (pooled)

Fecal Coliform

22697 9430

17796 4179

0.441 (pooled)

Fecal Streptococci

89325 24041

51307 12152

0.030 (pooled

Ammonia

0.188 0.055

0.105 0.042

0.064 (pooled)

Nitrite Plus Nitrate

0.346 0.064

0.411 0.103

0.387 (pooled)

Lead

10.68 2.01

8.94 2.65

0.402 (pooled)

Total Kjehldahl Nitrogen

0.785 0.116

0.706 0.167

0.532 (pooled)

Total Phosphorus

0.179 0.022

0.223 0.062

0.289 (pooled)

Total Suspended Solids

94.85 18.05

74.78 31.02

0.370 (pooled)

Volatile Suspended Solids

17.63 2.82

15.94 6.70

0.708 (pooled)

Zinc

66.84 10.85

57.73 10.34

0.327 (pooled)