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MEASUREMENTS OF BANK EROSION PER BOAT WAKE |
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US / English Units |
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Metric Units |
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Speed |
Boat length |
Estimated fuel |
Erosion per boat passage |
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Speed |
Boat length |
Estimated fuel |
Erosion per boat passage |
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knots |
mph |
feet |
miles /gal |
gal/ hour |
inches |
sq.ft/ mile |
sq.ft/ hour |
sq.ft /gal |
lb/hr |
sq.in /sec |
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kph |
m/sec |
meters |
km/ liter |
liters /hour |
mm |
sq.m/ km |
sq.m/ hour |
sq.m/ liter |
kg/hr |
sq.cm /sec |
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factor |
0.869 |
1.1508 |
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0.0394 |
880 |
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62.5 |
0.040 |
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1.6093 |
0.2778 |
0.3048 |
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3.7854 |
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2.000 |
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0.025 |
304.3 |
2.78 |
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California |
23.3 |
27 |
25 |
1.9 |
14 |
0.0039 |
3.47 |
93 |
7 |
5,800 |
3.7 |
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43 |
12 |
7.6 |
0.8 |
52 |
0.10 |
0.20 |
8.6 |
0.17 |
2,600 |
24 |
Cohesive clay/silt |
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California |
18.0 |
21 |
25 |
2.1 |
10 |
0.0037 |
3.30 |
68 |
7 |
4,300 |
2.7 |
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33 |
9 |
7.6 |
0.9 |
37 |
0.10 |
0.19 |
6.4 |
0.17 |
1,900 |
18 |
Cohesive clay/silt |
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Maryland |
17.4 |
20 |
16 |
6.3 |
3 |
0.0030 |
2.67 |
53 |
17 |
3,300 |
2.1 |
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32 |
9 |
4.9 |
2.7 |
12 |
0.08 |
0.15 |
5.0 |
0.41 |
1,500 |
14 |
Sand |
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California |
15.0 |
17 |
25 |
2.3 |
7 |
0.0052 |
4.61 |
80 |
11 |
5,000 |
3.2 |
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28 |
8 |
7.6 |
1.0 |
28 |
0.13 |
0.27 |
7.4 |
0.26 |
2,200 |
21 |
Cohesive clay/silt |
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California |
12.0 |
14 |
25 |
2.6 |
5 |
0.0082 |
7.18 |
99 |
19 |
6,200 |
4.0 |
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22 |
6 |
7.6 |
1.1 |
20 |
0.21 |
0.41 |
9.2 |
0.47 |
2,800 |
26 |
Cohesive clay/silt |
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Tasmania |
6.0 |
6.9 |
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0.0005 |
0.43 |
3 |
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200 |
0.1 |
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11 |
3 |
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0.01 |
0.03 |
0.3 |
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100 |
1 |
Cohesive clay/silt |
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California |
6.0 |
6.9 |
25 |
10.3 |
1 |
0.0012 |
1.04 |
7 |
11 |
400 |
0.3 |
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11 |
3 |
7.6 |
4.4 |
3 |
0.03 |
0.06 |
0.7 |
0.26 |
200 |
2 |
Cohesive clay/silt |
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Alaska,
Soldutna |
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18 |
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0.0059 |
5.20 |
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5.5 |
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0.15 |
0.30 |
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0.1 to 0.2mm, fine-grained non-cohesive |
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Alaska,
Kenai Keys |
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18 |
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0.0011 |
0.96 |
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5.5 |
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0.03 |
0.06 |
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0.3 to 30mm |
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Alaska,
RW's Camp |
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18 |
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0.0004 |
0.36 |
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5.5 |
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0.01 |
0.02 |
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0.1 to 0.3mm |
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MD
& AK observed a range of boat speeds & sizes; numbers here are
medians (half the boats were more, half less). |
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Total erosion (square meters or square feet) includes both riverbanks. |
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Weight eroded assumes 6 inch high face (.152 m) and 125 lbs/cubic foot (2002 kg/cubic meter). |
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Last
Updated on 4/24/2008
Email: wakesd@BoatWakes.info