Overall, the project is expected to have significant positive environmental impact due to improved coverage and efficiency of sewerage services in the city of Nairobi. It is also expected to contribute to decreased health risks associated with the current poor sanitation in the city.
In order to mitigate the impacts of climate change, the project has made provision for financing a tree planting program along the riparian zone which will serve the purpose of preventing encroaching and preserve the riparian zone and also for sequestering carbon.
The location of the wastewater infrastructure will be in areas, which are less prone to flooding, and the design specifications takes into account the effects of climate change and variability. It is expected that the project will have significant positive impacts on public health and quality of life among the population living along the Nairobi River Basin.
Part of the project will construct 100 ablution blocks and collector sewer lines in the informal settlement where basic sanitation services are minimal. Informal settlements constitute 40% to 60% of the population in the Nairobi city and are characterized by poor water and sanitation service provision. The residents in the informal settlements are predominantly low-income earners where 56% earn their livelihood through the informal sector on small-scale business located within the area or in the city.
The likely impact on women will emanate from dislocation arising from resettling the communities that are currently living in informal settlements along the riparian zone to pave way for laying of the trunk sewers. Majority of the women in the project area are engaged in small businesses for their livelihoods.
The project, through the Resettlement Action plan, has put in place mitigation measures to ensure minimum loss in their source of livelihoods through compensation. About 30% of the project beneficiaries are women.
This will provide them with opportunities to engage in project activities during the construction phase of the project, and therefore possibilities for income generation and meaningful contribution to the socio-economic development of their communities.