Workers need a dry, flat riverbed to erect the foundation of a new dam, so a rivers natural path is carefully analyzed. After geographical and geological surveys are conducted and computer modeling is applied to rivers flow. The process may begin the workers done alter the flow, the river, creating new channels for the water until the foundation is completed, typically small dams upon of the foundation to stare the water around the construction. Alternatively, tunnels can be plastic, so the river can flow underground temporarily, this preparation can take themselves take years of work before construction on the main. Dom starts to begin construction the river must be…..