The water stored in the reservoir below the minimum pool level is called A. useful storage B. dead storage C. valley storage D. surcharge storage

The correct answer is: B. dead storage

Dead storage is the water stored in a reservoir below the minimum pool level. It is not available for use and is used to maintain the integrity of the dam.

• Useful storage is the water stored in a reservoir above the minimum pool level and is available for use.
• Valley storage is the water stored in a reservoir during periods of high
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  flow. It is used to regulate the flow of water downstream.
• Surcharge storage is the water stored in a reservoir above the maximum pool level. It is not available for use and is used to protect the dam from overtopping.

I hope this helps! Let me know if you have any other questions.