There are several examples of retrofitting infrastructure to mitigate impacts on ecosystem services, such as opening of spillways of dams to allow fish passages, which however is very costly in terms of lost power production. This is being experienced in the Columbia River. In the Senegal Delta, managed flood releases were instigated to restore seasonal variability, thus allowing local people to enjoy the benefits of the ecosystem services they had lost when the dam was built. Repair of such failures is very costly, not only in terms of cost of investment and lost production, but also in terms of the suffering experienced by local people