De-silting a lake or pond is tiresome, messy, difficult work and is rarely accomplished with ease. De-silting work varies greatly depending on factors as diverse as water removal, type of silt (organic or inorganic), the concentration of the silt, where the silt can be disposed of, the bed of the lake or pond that currently exists, if there are fish or other types of wildlife to remove or relocate and many other issues too numerous to mention.
Here are the main methods of silt removal from lakes, ponds and rivers:-
- Mechanical Dredging
- Silt digestion
Dredging is the term generally used for the removal of silt from a water course involving the mobilisation of excavation plant and equipment. This system of removal is usually completed by either removing the water from the watercourse in order to create a terrestrial environment or by using specialised aquatic dredging machinery with modified tracks or floating pontoons. Mechanical dredging can be carried out using excavators with standard arms and long reach arms, barges and dragline excavators. The most popular tend to be excavators.Using excavators for dreding means you have to find a way of removing the material, and there are three main methods of dredging,
- Conveyor Belt system
- Bulk moving using tracked or wheeled dumpers
- On-site Bunding
Pumping - The benefit of silt pumping is that the majority of the work can be completed on water and no bulk moving needs to take place unlike mechanical dredging, and this reduces damage to the ground. Silt pumping can be carried out with the use of excavators to lift the pump in and out of the area, with the use of floating craft such as floating diggers, pontoons or boats, or it can be carried out on the bank of the lake, river or pond. There are two pumping systems that can be used to remove silt from a lake or river, these are hydraulic pumps and vacuum pumps. The best ways to remove material when pumping are listed below.
- Pumping silt into de-watering bags
- Pumping into a bund away from the waterbody
- Pumping into bunds on the banks so after the silt has dried they can be used for planting.
Silt digestion is the process of applying a silt digestion product such as our very own product AlphaSilt into the lake, river or pond, which promotes oxidisation, enabling silt digesting micro-organisms to thrive.
Heathland Aquatic Engineering offer a full consultancy, survey, dredging and de-silting service. Our team of skilled machine operators and engineers have been involved with many silt removal and management projects around the UK and internationally and would be provide information or answer any questions or queries you might have.
We supply all the necessary dredging and silt removing equipment and our dredging and silt removal services to both domestic and commercial clients in Norfolk, Suffolk, Essex, Kent, London and throughout the United Kingdom. For more information and advice about any of our silt digestion products, dredging, lake or river management and maintenance and fishery and consultancy services, please email [email protected], call 0800 3891990.