View the Whole Report - Center for Research in Water Resources ...
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The <strong>in</strong>ventory data <strong>in</strong>dicate that silt fences and rock berms are <strong>the</strong> most<br />
economical controls over <strong>the</strong> entire study area on a dollar-per-area-dra<strong>in</strong>ed basis.<br />
However, <strong>the</strong> higher unit costs calculated <strong>for</strong> sedimentation ponds was caused by one<br />
large temporary pond at <strong>the</strong> US 290 and Loop 360 <strong>in</strong>terchange site. Much of <strong>the</strong> cost <strong>for</strong><br />
this pond was <strong>in</strong>curred <strong>in</strong> excavation. Sedimentation ponds were more cost-effective than<br />
ei<strong>the</strong>r silt fences or rock berms when this particular pond is excluded from <strong>the</strong><br />
comparison. The average cost-per-area-dra<strong>in</strong>ed <strong>for</strong> <strong>the</strong> six sites surveyed was $151/ha <strong>for</strong><br />
sedimentation ponds (exclud<strong>in</strong>g <strong>the</strong> pond at <strong>the</strong> highway 290/360 site), $379/ha <strong>for</strong> silt<br />
fences, and $318/ha <strong>for</strong> rock berms. Erosion control blankets, used solely to prevent<br />
erosion, are very expensive devices ($11,437/ha).<br />
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