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Dredging and De-Silting

 

Dredging & De-Silting

Aqua Science Ltd provide de-silting and dredging options where these are appropriate to return areas to a more natural state. Dredging and de-silting operations can become necessary for a number of reasons.

For some water bodies water depths can become too shallow impacting on fish and other species due to:

  • Inputs of suspended solids causing silt build up
  • Build up of leaf litter reducing water depths

Although silt build up is a relatively slow process, ponds will become progressively shallower over time. In periods of low rainfall water levels could fall further resulting in even shallower conditions causing problems for pond/lake ecology. Continuing accumulation of silt is detrimental to the long-term viability of these water and therefore there is a need to dredge or de-silt to create areas of deeper water.

With our fully trained staff who have a high awareness of the habitat in which they are working we can create areas of deeper water using diggers. Organic rich silt provides the nutrients which drive the ponds productivity.

We often recommend that some areas of the pond are deepened for the purpose of providing fish refuge during periods of low water level, increasing habitat diversity and to prolong the viable lifetime of the fishery.

Silt removal can be a problematic, inefficient and challenging operation. However, the success and efficiency is greatly assisted where ponds can be drained prior to works so that silt partially dries and becomes easier to handle and transport.

A waste licensing exemption will need to be granted for the deposit of excavated silt. We give consideration to retaining silt within the pond boundary in order to improve marginal habitat.  The extent of marginal habitat creation will determine the volume of silt required to be removed from the pond to the disposal site.


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