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Excerpt from
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Improving the Cost Effectiveness of Highway Construction Site Erosion and
Pollution Control WA-RD-200.1 Washington State Department of Transportation
01/1990 |
[Pg-40,para 2
WA-RD-200.1]
Cost Effective Calculations
(Table has been modified. See note below)
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Table 12. |
PERFORMANCE
AND ECONOMY INDICES FOR SLOPE COVERINGS AND SEDIMENTATION PONDS TESTED IN
THE RESEARCH PROGRAM |
|
TECHNIQUE |
Relative Economy Index |
Relative Effectiveness Measure in Reducing: |
Overall |
|
Erosion |
Phosphorus yield |
Metals yield |
Organics yield |
Effectiveness |
Cost Effectiveness |
|
Straw (4 T/ac) |
41 |
89 |
87 |
85 |
49 |
81 |
44 |
|
Straw (1.25 T/ac) |
52 |
95 |
100 |
90 |
93 |
100 |
70 |
|
Straw (4 T/ac, manure-mulched, fertilized,
seeded |
50 |
95 |
4 |
88 |
20 |
57 |
38 |
|
Jute Matting |
35 |
61 |
31 |
65 |
52 |
55 |
26 |
|
Excelsior |
36 |
29 |
25 |
29 |
14 |
26 |
12 |
|
Woven Straw Blanket |
32 |
93 |
98 |
81 |
61 |
87 |
37 |
|
Synthetic Fiber Blanket |
39 |
72 |
69 |
69 |
62 |
71 |
38 |
|
Woodfiber mulch (1.25 T/ac) fertilized,
seeded |
100 |
87 |
71 |
74 |
50 |
74 |
100 |
|
E
R
O
-
B
O
N
D |
Woodfiber mulch (1.25 T/ac) w/ ERO-BOND
(50 gal./ac) fertilized, seeded |
68 |
87 |
71 |
65 |
27 |
66 |
61 |
|
Woodfiber mulch (1.25 T/ac) w/ ERO-BOND
(90 gal./ac) fertilized, seeded |
62 |
100 |
92 |
100 |
94 |
88 |
74 |
|
Woodfiber mulch (1.25 T/ac) w/ ERO-BOND (120 gal./ac)
fertilized, seeded |
57 |
100 |
97 |
100 |
100 |
95 |
72 |
|
Chemical Agent |
36 |
-48 |
-41 |
-25 |
-42 |
-49 |
-24 |
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- Table layout has been
modified to delete raking with other test plots and retention pond
information.
- The word tackifier in
this report, refers to ERO-BOND Liquid Soil Bonding Agent. The word tackifier
in the hydroseeding industry refers to a dry powder vegetable based product,
usually guar gum. The holding capacities and longevity of ERO-BOND are
significantly greater than vegtable based gums.
- Complete Report Availible
from National Technical Information Service Springfield, Va.
22616
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