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Sediment Trap (ST) SC-8 Description Sediment traps are formed by excavating an area or by placing an earthen embankment across a low area or drainage swale. Sediment traps are designed to capture drainage from disturbed areas less than one acre and allow settling of sediment. Appropriate Uses Sediment traps can be used in combination with other layers of erosion and sediment controls to trap sediment from small drainage areas (less than one Photograph ST-1. Sediment traps are used to collect sediment-laden runoff from disturbed area. Photo courtesy of EPA Menu of BMPs. acre) or areas with localized high sediment loading. For example, sediment traps are often provided in conjunction with vehicle tracking controls and wheel wash facilities. Design and Installation A sediment trap consists of a small excavated basin with an earthen berm and a riprap outlet. The berm of the sediment trap may be constructed from the excavated material and must be compacted to 95 percent of the maximum density in accordance with ASTM D698. An overflow outlet must be provided at an elevation at least 6 inches below the top of the berm. See Detail ST-1 for additional design and installation information. Maintenance and Removal Inspect the sediment trap embankments for stability and seepage. Remove accumulated sediment as needed to maintain the effectiveness of the sediment trap, typically when the sediment depth is approximately one-half the height of the outflow embankment. Inspect the outlet for debris and damage. Repair damage to the outlet, and remove all obstructions. A sediment trap should not be removed until the upstream area is sufficiently stabilized. Upon removal of the trap, the disturbed area should be covered with topsoil and stabilized. Sediment Trap Functions Erosion Control Sediment Control Site/Material Management No Yes No November 2010 Urban Drainage and Flood Control District ST-1 Urban Storm Drainage Criteria Manual Volume 3
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Sediment Trap (ST)<br />
SC-8<br />
Description<br />
Sediment traps are formed by excavating<br />
an area or by placing an ear<strong>the</strong>n<br />
embankment across a low area or<br />
drainage swale. Sediment traps are<br />
designed to capture drainage from<br />
disturbed areas less than one acre and<br />
allow settling of sediment.<br />
Appropriate Uses<br />
Sediment traps can be used in<br />
combination with o<strong>the</strong>r layers of erosion<br />
and sediment controls to trap sediment<br />
from small drainage areas (less than one<br />
Photograph ST-1. Sediment traps are used to collect sediment-laden<br />
runoff from disturbed area. Photo courtesy of EPA Menu of BMPs.<br />
acre) or areas with localized high sediment loading. For example, sediment traps are often provided in<br />
conjunction with vehicle tracking controls and wheel wash facilities.<br />
Design and Installation<br />
A sediment trap consists of a small excavated basin with an ear<strong>the</strong>n berm and a riprap outlet. The berm<br />
of <strong>the</strong> sediment trap may be constructed from <strong>the</strong> excavated material and must be compacted to<br />
95 percent of <strong>the</strong> maximum density in accordance with ASTM D698. An overflow outlet must be<br />
provided at an elevation at least 6 inches below <strong>the</strong> top of <strong>the</strong> berm. See Detail ST-1 for additional design<br />
and installation information.<br />
Maintenance and Removal<br />
Inspect <strong>the</strong> sediment trap embankments for stability and seepage.<br />
Remove accumulated sediment as needed to maintain <strong>the</strong> effectiveness of <strong>the</strong> sediment trap, typically<br />
when <strong>the</strong> sediment depth is approximately one-half <strong>the</strong> height of <strong>the</strong> outflow embankment.<br />
Inspect <strong>the</strong> outlet for debris and damage. Repair damage to <strong>the</strong> outlet, and remove all obstructions.<br />
A sediment trap should not be removed until <strong>the</strong> upstream area is sufficiently stabilized. Upon removal of<br />
<strong>the</strong> trap, <strong>the</strong> disturbed area should be covered with topsoil and stabilized.<br />
Sediment Trap<br />
Functions<br />
Erosion Control<br />
Sediment Control<br />
Site/Material Management<br />
No<br />
Yes<br />
No<br />
November 2010 <strong>Urban</strong> <strong>Drainage</strong> and Flood Control District ST-1<br />
<strong>Urban</strong> Storm <strong>Drainage</strong> <strong>Criteria</strong> <strong>Manual</strong> <strong>Volume</strong> 3