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They may also work with hydrologists in dam construction and flood control . To this end , we are converting forest to pasture , constructing roads , damming rivers , and encouraging immigration on a larger scale . Factors responsible for losses and degradation include diversions and damming of river flows , disconnecting floodplain wetlands from flood flows , eutrophication , contamination , grazing , harvests of plants and animals , global warming , invasions of exotics , and the practices of filling , dyking and draining . The following are some of the more serious environmental impacts of dams on rivers and the life they support . The horrendous record of forced resettlement ( with perhaps 60 million people worldwide displaced by dams and the great majority never able to regain previous living standards ) and the numerous other impacts of dams on the livelihoods of riverine people ( such as increased waterborne diseases and the loss of traditional floodplain agriculture and fisheries ) also show that there can be little social justification for dam building . However the huge range of negative impacts of dams dictate that dams , just like nukes , should not be viewed as part of the solution to global warming . But the true risks and costs of dams are being forced into the open due to increasing public scrutiny and attempts to attract private investors to existing and new projects . The groundwater level in the region increased due to the damming of the Danube ( up to 3 metres downstream of Bratislava ) . Issues pertaining to Native American water rights , primarily as to tribes , including sovereignty , general water law principles , case law , the impact of damming projects , and the adjudication , litigation , and negotiation of tribal water rights . Created in 1977 by damming the Grange Burn , it is a popular venue for fishing and water sports such as waterskiing , boating , swimming , sailboarding , rowing and canoeing .