(iii) Two problems that affect the production of power from the stations along River Tana are:

Here is the answer to the remaining part of question 9:

9. (b) (iii) Two problems that affect the production of power from the stations along River Tana are:

• Siltation: The accumulation of silt and sediment in the dam reservoirs reduces their water storage capacity and can damage turbines, thereby lowering power generation efficiency.
• Droughts: Prolonged periods of low rainfall lead to significantly reduced water levels in the reservoirs, which directly impacts the amount of water available to drive the turbines and generate electricity.