Onstruction method statement and risk assessment

I have to produce a complete design for the reinforced concrete diversion channel, which will be capable of carrying the required river flows in a safe, durable and economic manner. Also I have to design a footbridge, which will pass over the channel. I would like to write a construction method and a risk assessment. I would like you to write about the following: The construction method statement will descried how I will build the structure, what plant and procedures will be needed, if there are any specific health and safety issues, and how long it will be take to complete.