| Construction Pictures Click on preview image to view full-size image. |
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The gravel sub-drain is laid followed by 2' coarse sand filter. Because of the high infiltration rate, the size of the sand filter bed can be minimized. |
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Illustration showing completion of sand filter bed. |
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Erosion control matting around upper slopes is required prior to vegetative slope stabilization. Erosion control during construction and prior to stabilization is very important to prevent clogging of the filter bed. |
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Close-up of coarse sand used in filter bed. Filter bed maintenance includes removal of fines from the top layer and, if needed, additional sand. |