Posted at 11.26.2018
The building of large dams always change the relationship of normal water and land that destroy the existing ecosystem balance whereas in many cases, has taken thousands of years to make. Now, there remain 40, 000 large dams that obstruct the world's streams, completely changing their blood flow systems. This is not going that occurs without dire environmental influences. About past couple of years, the negative influences of dams have become so familiar that almost all of countries had to avoid building them altogether and are now forced to get their money into fixing the problems created by existing dams.
Construction of the dam does not actually only bring benefits. But on the other palm there are undesireable effects of dam building that existed before and after engineering must be considered. You won't only affect the structure environment, but can depend on the river mouth area. Among the effects of dam construction is:-
ECOLOGICAL SYSTEM PROBLEMS
No doubt the condition will arise inside our ecosystem. It really is usually starts right from the start of the constructions before affected downstream natural river. Many circumstances studies and much information can't be used as guide materials before extinct. Indirectly, the hereditary diversity of natural resources and ruined. Many endangered varieties of aquatic pets, land, forest issues.
Construction of dams required extensive land clearing without any control. Just as Bakun with Lake Chini has a substantial impact and can be seen clearly. By far the most obvious example of the Bakun dam has demolished the natural habitat of 70. 000 hectares of Singapore. Another example is the dam of Lake Chini, Pahang is also clear that we now have 60 hectares of forest. Vegetative ruined ecosystems and therefore have an impact on animals. Disturbed the natural habitat and cause the organism to discover a new habitat or the continued extinction of the region.
In Temenggor, dam have been identified as factors behind this issue with the number of seafood in the Sungai Perak terubuk decreasing. Another problem is the copy of pets or animals from the forest to the profession. This triggers problems for local residents who live nearby. As an example was the construction of typical dam at Bakun. This problem increase if no action is used and control.
Other example, the duplication of freshwater turtles is threatened by this example. It also stops the passing of freshwater turtles and seafood and thus inhibits their breeding habits and activities.
In streams with biologically beneficial estuaries, both sea and fish and also shellfish have problems with the changes in normal water flow and quality. Changes in fresh and quality normal water moves and the salinity balance within an estuary will change species distribution and breeding routine of seafood. Furthermore, changes in nutrient levels and decrease in the grade of the river water can also offers bad impacts on the productivity of the seafood.
These changes can also have major effects on marine varieties which is the supply of these life pattern in the sea, or are affected by drinking water quality changes in the coastal areas. The greatest impact on animals will come from lack of habitat. That is as derive from the reservoir filling up and land use changes in the catchment area. Migratory patterns of wildlife and the fish may be disrupted by the dam. This can make the aquatic fauna, include waterfowl, amphibians and reptiles can increase because of the development of dam.
Usually, the river will be influence on land erosion and the silt occurs during the construction and removal of water. Because of that, water becomes brownish and it was induced of the problem for progress of aquatic plant life. But on the other hand, the river is a shortage of nutrients credited to system problems slowed the move of water induced drinking water dam. Then, rate of mineral and air was reducing. Further problems occur when people cultivated their vegetation. The used of pesticides can't be drained and recycled in a river. The material from the structure of dam itself which is the metal use rates also impact drinking water quality when drinking water is released from the dam.
The obvious changes take place in the timing of stream, quality, number and use of normal water, aquatic biota, and sedimentation in the river basin. The area of influence of your dam construction jobs extend from the top limits of the catchment of the reservoir to as way downstream as the sea and shoreline or offshore zone. While there are immediate environment impacts related to the structure of the dam for samples, particles, erosion, borrow and the removal problems. The greatest impacts derive from the impoundment of drinking water, flooding of land to form the dam and alteration of drinking water flow downstream. These results also have direct effects on soils, vegetation, wildlife and wild lands, fisheries, weather and also the human populations for the reason that area.
Construction of the dam comes with an adverse effect on river hydro ecosystem. Other drawbacks are affected seafood populace in the river if the construction of the dam took place at the top river. That situation occurred on the Temenggor Dam, Bersia Kenering. Deep review was done in Lake Chenderoh. Fishery catches in the dam is low in support of 22 kinds were captured, and 15 of them consisted of fish caught by family Cyprinid. Most using drift nets, which small shows lack large fish in that dam. Results show catch per unit effort will be between (2. 7 - 12. 8 kg. per fisherman-day with a value between RM4. 94-32. 43-per-day fishing.