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) |