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Project List — Vertical Bristle Elver Pass
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1) Matt surveying one of the sediment trap obstructions on the river Ashburn in Devon. The project brief was to give elvers access to habitat upstream of the sediment traps. |
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2) Design drawing produced showing the proposed vertical bristle board elver pass in situ. Projected water levels are also shown over the Q95 to Q10 range of exceedance flows. |
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3) Pictures of the finished installation—the boards are cut and welded on site allowing an exact fit to be achieved. This is a very cost effective method for allow elvers access beyond an obstruction - no pump or electrical supply is required because there is no need to actively irrigate the pass. A further advantage of this type of vertically mounted installation is that the pass will operate effectively over a wide range of flow conditions and upstream water levels providing an air/water interface over a wide range of water levels. |
