Poorly designed causeways and canals, constructed to bring in heavy drilling equipment, affect the hydrology of the seasonally flooded fresh water swamps and the brackish water of the mangrove forest. Canals disrupt the delicate hydrological system, especially when they are constructed on the border zone between freshwater and brackish water in the riverine areas; as such, they can disrupt the viability of long-established fishing grounds. In the study area, a canal dug by Chevron near one of the oil-bearing communities in Polobubou/Tsekelewu and Opuama has reportedly caused accelerated erosion near the sea and has destroyed the local hydrological system by allowing saltwater into previous freshwater areas, thereby creating a saltwater marsh in place of much higher biodiversity freshwater swamp. Since the canalization of the area, salt water from the ocean has completely altered their ecosystem and endangered the community’s means of survival; specifically, the traditional fishing ground and source of drinking water have been wiped out. No measures taken by Chevron to address this negative environmental impact. Findings seem to indicate that the oil-bearing areas are left to bear the negative environmental impact without any support from the oil companies. However, these artificial canals not only allow saline waters of the Atlantic into freshwater sources, they also lead to the scarcity of drinking water and kill many species of plants, animals and fishes. Their construction has precipitously altered the entire ecosystem, as freshwater is destroyed.The Canal has to be closed and everything possible done to restore the livelihood of my people.so lives will be saved and the communities won't go into extinction. Polobubou/Tsekelewu/Opuama Communities, Egbema, Delta state,Nigeria