Pond dredging refers to the excavation process done partially under-water in shallow water masses. It entails elimination and disposal of sediment and other materials at the base of ponds. Besides ponds, this process may also be performed on shallow lakes, rivers, dams, and seas among others. There are many reasons and benefits for doing this exercise once in a while.
One of the reason is to make the water body navigable. Continued deposition of sediment at the bottom of a water body reduces its deepness, making it hard for vessels to move or dock in them. Erosion carries away sand each time tides rise along the coastal line. Sand is substituted with other sediment materials that are not secure for coasts. This method can be applied to replenish sand.
Dredging is also useful for making ponds more suitable for inhabiting by fish. Sediment deposition reduces pond depths hence making them unsuitable for inhabiting by some species of fish. Sediments may also be harmful to fish if they are composed of harmful materials such as aluminium or other heavy metals. Then finally, dredging can also be used as a fishing method for some species of edible crabs and clams.
A dredger is the universal word used to refer to tools, machines, or vessels used in excavating sediment from the floor of water masses. Dredgers range from plain handheld tools to sophisticated cranes used in removing sediment on large scale. The material extracted should be disposed far in order to prevent them from returning back easily. The sediments could be important for reclaimed pieces of land. It however is worth knowing that this activity can result into some serious issues in the aquatic ecosystem.
There are various methods of dredging consisting of suction, pneumatic, water injection, bed leveler, backhoe, snagboat, air-lift, amphibious, jet-lift, and clamshell among several others. In suction process, materials get sucked through long pipes. Its functioning resembles that of vacuum cleaners with the main difference being that this is done on very large scales. These sediments are eliminated through the other open end of the tube into a truck or trailer. This is the most prevalent kind of dredging in use currently.
In water injection dredging, tiny jets are utilized to introduce water under low pressure into the floor to make materials become suspended. These sediments then become turbidity currents, which flow down slope into other designated places. This skill is more appropriate if the pond is connected to another source of moving water.
Bucket dredgers contain pails on their sides for picking sediments mechanically. One dredger may contain multiple buckets attached on chains or wheels which move in circles. Some versions of these dredgers are adequately powerful to create a shipping trail through coral reefs. Grab dredgers use clamshell buckets to pick sediment from the pond floors. Clamshell buckets dangle from onboard cranes or/and crane barges.
Pond dredging process should be performed occasionally. The process is a healthy activity and one should seek experts in the field to carry it out safely. Most corporations charge in accordance to the size of the water mass in question.
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