The general achievements of the river connecting is based on the engineering safety of the dams. Channels and structures in the link. As geological conditions that could result in failure of tunnels, dams. Aqueducts and erosion of channels are of common occurrence a geological study of the linking channels is essential. While comparing the cost of a tunnel with that of an open channel, the cost of protection works required for the tunnels and channels must also be taken into account. Dams required to divert the channels as well as the foundations of the aqueducts will also have to be properly investigated in engineering geological perspective. Sufficient time will usually be available to carry out the necessary geological investigations.