Unit 2: Costs and benefits associated with 3 gorges dam dam

This BBC article outlines clearly the costs and benefits to China of building the massive 3 gorges dam

http://news.bbc.co.uk/1/hi/world/asia-pacific/7013953.stm

a) Outline the private costs of building the dam
b) Outline the private benefits of building the dam
c) Outline the external costs of building the dam
d) Outline the external benefits of building the dam
e) Assuming a CBA had been conducted on the proposed dam before the start of the project, what other factors might the government have taken into consideration