Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the right order to form a meaningful and coherent paragraph.
A. In some cases, the problem of the lowering of the river bottom has caused the water table of the surrounding area to drop, which has adversely affected agriculture.
B. Also, another problem, canalization with its extensive system of locks and navigation dams, often seriously disrupts riverine ecosystems.
C. The ever-increasing exploitation of rivers has given rise to a variety of problems.
D. Further, extensive commercial navigation of rivers has resulted in much artificial improvement of natural channels, including increasing the depth of the channels to permit passageof larger vessels.