Dead Storage in Dam Reservoir Multiple Choice Question
(A) Bed level of the reservoir and the silt level in the reservoir
(B) Bed level of the reservoir and the normal pool level
(C) Bed level of the reservoir and minimum reservoir level
(D) None of the above
Explanation
The dead storage in a dam reservoir is the volume below the minimum reservoir level (also known as the Minimum Drawdown Level or MDDL), extending down to the bed level of the reservoir. This portion cannot be drained by gravity through the dam's outlets and is primarily used for collecting silt and sediment, ensuring that usable water storage remains unaffected.
Key Reservoir Levels and Their Roles
| Level Name | Abbreviation | Purpose | Location in Reservoir |
|---|---|---|---|
| Minimum Pool Level | MPL / MDDL | Lowest operational level; top of dead storage | Bottom-most usable level |
| Full Supply Level | FSL / FRL | Maximum storage for normal use | Top of live storage |
| Normal Pool Level | NPL | Regular operating level | Usually at or near FSL |
| Maximum Pool Level | MWL | Flood control; maximum safe level | Above FSL, below dam crest |
Key Notes
- Dead storage is reserved for sediment accumulation, protecting the reservoir’s usable capacity and maintaining structural stability.
- The minimum reservoir level (MDDL) is critical for safe turbine operation in hydropower plants and marks the boundary between live and dead storage.
- Normal and Full Supply Levels manage regular water use, while Maximum Pool Level ensure flood safety.
- Proper reservoir design, including dead storage, is essential in civil engineering for long-term water management and dam safety.
Note: Dead storage between the bed level and minimum reservoir level is a critical design consideration in dam reservoirs, ensuring sediment accumulation does not compromise functionality in civil engineering projects.
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